lightning/CHANGELOG.md

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog.

[1.4.0] - 2021-MM-DD

Added

• Added support to LightningModule.to_torchscript for saving to custom filesystems with fsspec (#7617)

• Added KubeflowEnvironment for use with the PyTorchJob operator in Kubeflow

• Added LightningCLI support for config files on object stores (#7521)

• Added ModelPruning(prune_on_train_epoch_end=True|False) to choose when to apply pruning (#7704)

• Added support for checkpointing based on a provided time interval during training (#7515)

• Added dataclasses for progress tracking ( #6603, #7574)

• Added argument trainer.predict(ckpt_path) (#7430)

• Added clip_grad_by_value support for TPUs (#7025)

• Added sub_dir parameter to TensorBoardLogger (#6195)

• Added correct dataloader_idx to batch transfer hooks (#6241)

• Added ddp_fully_sharded support (#7487)

• Added __len__ to IndexBatchSamplerWrapper (#7681)

• Added should_rank_save_checkpoint property to Training Plugins (#7684)

• Added save_config_filename init argument to LightningCLI to ease resolving name conflicts (#7741)

Changed

• Changed calling of untoggle_optimizer(opt_idx) out of the closure function (#7563

• Changed the Trainer's checkpoint_callback argument to allow only boolean values (#7539)

• Log epoch metrics before the on_evaluation_end hook (#7272)

• Changed these Trainer methods to be protected: call_setup_hook, call_configure_sharded_model, pre_dispatch, dispatch, post_dispatch, call_teardown_hook, run_train, run_sanity_check, run_evaluate, run_evaluation, run_predict, track_output_for_epoch_end

• Changed clip_grad_norm to use torch.nn.utils.clip_grad_norm_ (#7025)

• Validation is now always run inside the training epoch scope (#7357)

• Refactored Loops

  • Moved attributes global_step, current_epoch, max/min_steps, max/min_epochs, batch_idx, and total_batch_idx to TrainLoop (#7437)
  • Refactored result handling in training loop (#7506)
  • Moved attributes hiddens and split_idx to TrainLoop (#7507)
  • Refactored the logic around manual and automatic optimization inside the optimizer loop (#7526)
  • Simplified "should run validation" logic (#7682)
  • Refactored "should run validation" logic when the trainer is signaled to stop (#7701)

• Refactored logging

  • Renamed and moved core/step_result.py to trainer/connectors/logger_connector/result.py (#7736)

• Moved ignore_scalar_return_in_dp warning suppression to the DataParallelPlugin class (#7421)

• Changed the behaviour when logging evaluation step metrics to no longer append /epoch_* to the metric name (#7351)

• Changed resolve_training_type_plugins to allow setting num_nodes and sync_batchnorm from Trainer setting (#7026)

• Default seed_everything(workers=True) in the LightningCLI (#7504)

• Changed model.state_dict() in CheckpointConnector to allow training_type_plugin to customize the model's state_dict() (#7474)

• MLflowLogger now uses the env variable MLFLOW_TRACKING_URI as default tracking uri (#7457)

• Changed WandbLogger(log_model={True/'all'}) to log models as artifacts (#6231)

• MLFlowLogger now accepts run_name as an constructor argument (#7622)

• Changed teardown() in Accelerator to allow training_type_plugin to customize teardown logic (#7579)

Deprecated

• Deprecated TrainerModelHooksMixin in favor of pytorch_lightning.utilities.signature_utils (#7422)

• Deprecated num_nodes and sync_batchnorm arguments in DDPPlugin and DDPSpawnPlugin (#7026)

Removed

• Removed ProfilerConnector (#7654)

• Prune deprecated classif. metrics from pytorch_lightning.metrics.functional.classification (#7499)

• Removed deprecated data parallel classes LightningDataParallel and LightningDistributedDataParallel from pytorch_lightning.overrides.data_parallel (#7510)

• Removed deprecated trainer attributes - get_model and accelerator_backend (#7502)

• Removed support for self.log(tbptt_reduce_fx) and self.log(tbptt_pad_token). Please, open a discussion explaining your use-case if you relied on these. (#7644)

• Removed deprecated utils modules model_utils, warning_utils, xla_device_utils and partially argparse_utils (#7503)

• Removed deprecated trainer attributes - on_cpu, on_tpu, use_tpu, on_gpu, use_dp, use_ddp, use_ddp2, use_horovod, use_single_gpu (#7501)

Fixed

• Fixed ambiguous warning when both overfit and train dataloader shuffling are enabled (#7685)

• Fixed dataloaders are not reset when tuning the model (#7566)

• Fixed global step update when the epoch is skipped (#7677)

• Fixed training loop total batch counter when accumulate grad batches was enabled (#7692)

• Fixed broadcasting in multi-node, multi-gpu DDP using torch 1.7 (#7592)

• Fixed ProgressBar pickling after calling trainer.predict (#7608)

• Fixed None loss keys getting added in training_epoch_end when using manual optimization and not returning a loss (#7772)

• Fixed print errors in ProgressBar when trainer.fit is not called (#7674)

• Fixed formatting of info message when max training time reached (#7780)

[1.3.2] - 2021-05-18

Changed

• DataModules now avoid duplicate {setup,teardown,prepare_data} calls for the same stage (#7238)

Fixed

• Fixed parsing of multiple training dataloaders (#7433)
• Fixed recursive passing of wrong_type keyword argument in pytorch_lightning.utilities.apply_to_collection (#7433)
• Fixed setting correct DistribType for ddp_cpu (spawn) backend (#7492)
• Fixed incorrect number of calls to LR scheduler when check_val_every_n_epoch > 1 (#7032)

[1.3.1] - 2021-05-11

Fixed

• Fixed DeepSpeed with IterableDatasets (#7362)
• Fixed Trainer.current_epoch not getting restored after tuning (#7434)
• Fixed local rank displayed in console log (#7395)

[1.3.0] - 2021-05-06

Added

• Added support for the EarlyStopping callback to run at the end of the training epoch (#6944)
• Added synchronization points before and after setup hooks are run (#7202)
• Added a teardown hook to ClusterEnvironment (#6942)
• Added utils for metrics to scalar conversions (#7180)
• Added utils for NaN/Inf detection for gradients and parameters (#6834)
• Added more explicit exception message when trying to execute trainer.test() or trainer.validate() with fast_dev_run=True (#6667)
• Added LightningCLI class to provide simple reproducibility with minimum boilerplate training CLI ( #4492, #6862, #7156, #7299)
• Added gradient_clip_algorithm argument to Trainer for gradient clipping by value (#6123).
• Added a way to print to terminal without breaking up the progress bar (#5470)
• Added support to checkpoint after training steps in ModelCheckpoint callback (#6146)
• Added TrainerStatus.{INITIALIZING,RUNNING,FINISHED,INTERRUPTED} (#7173)
• Added Trainer.validate() method to perform one evaluation epoch over the validation set (#4948)
• Added LightningEnvironment for Lightning-specific DDP (#5915)
• Added teardown() hook to LightningDataModule (#4673)
• Added auto_insert_metric_name parameter to ModelCheckpoint (#6277)
• Added arg to self.log that enables users to give custom names when dealing with multiple dataloaders (#6274)
• Added teardown method to BaseProfiler to enable subclasses defining post-profiling steps outside of __del__ (#6370)
• Added setup method to BaseProfiler to enable subclasses defining pre-profiling steps for every process (#6633)
• Added no return warning to predict (#6139)
• Added Trainer.predict config validation (#6543)
• Added AbstractProfiler interface (#6621)
• Added support for including module names for forward in the autograd trace of PyTorchProfiler (#6349)
• Added support for the PyTorch 1.8.1 autograd profiler (#6618)
• Added outputs parameter to callback's on_validation_epoch_end & on_test_epoch_end hooks (#6120)
• Added configure_sharded_model hook (#6679)
• Added support for precision=64, enabling training with double precision (#6595)
• Added support for DDP communication hooks (#6736)
• Added artifact_location argument to MLFlowLogger which will be passed to the MlflowClient.create_experiment call (#6677)
• Added model parameter to precision plugins' clip_gradients signature ( #6764, #7231)
• Added is_last_batch attribute to Trainer (#6825)
• Added LightningModule.lr_schedulers() for manual optimization (#6567)
• Added MpModelWrapper in TPU Spawn (#7045)
• Added max_time Trainer argument to limit training time (#6823)
• Added on_predict_{batch,epoch}_{start,end} hooks (#7141)
• Added new EarlyStopping parameters stopping_threshold and divergence_threshold (#6868)
• Added debug flag to TPU Training Plugins (PT_XLA_DEBUG) (#7219)
• Added new UnrepeatedDistributedSampler and IndexBatchSamplerWrapper for tracking distributed predictions (#7215)
• Added trainer.predict(return_predictions=None|False|True) (#7215)
• Added BasePredictionWriter callback to implement prediction saving (#7127)
• Added trainer.tune(scale_batch_size_kwargs, lr_find_kwargs) arguments to configure the tuning algorithms (#7258)
• Added tpu_distributed check for TPU Spawn barrier (#7241)
• Added device updates to TPU Spawn for Pod training (#7243)
• Added warning when missing Callback and using resume_from_checkpoint (#7254)
• DeepSpeed single file saving (#6900)
• Added Training type Plugins Registry ( #6982, #7063, #7214, #7224 )
• Add ignore param to save_hyperparameters (#6056)

Changed

• Changed LightningModule.truncated_bptt_steps to be property (#7323)
• Changed EarlyStopping callback from by default running EarlyStopping.on_validation_end if only training is run. Set check_on_train_epoch_end to run the callback at the end of the train epoch instead of at the end of the validation epoch (#7069)
• Renamed pytorch_lightning.callbacks.swa to pytorch_lightning.callbacks.stochastic_weight_avg (#6259)
• Refactor RunningStage and TrainerState usage ( #4945, #7173)
  • Added RunningStage.SANITY_CHECKING
  • Added TrainerFn.{FITTING,VALIDATING,TESTING,PREDICTING,TUNING}
  • Changed trainer.evaluating to return True if validating or testing
• Changed setup() and teardown() stage argument to take any of {fit,validate,test,predict} (#6386)
• Changed profilers to save separate report files per state and rank (#6621)
• The trainer no longer tries to save a checkpoint on exception or run callback's on_train_end functions (#6864)
• Changed PyTorchProfiler to use torch.autograd.profiler.record_function to record functions (#6349)
• Disabled lr_scheduler.step() in manual optimization (#6825)
• Changed warnings and recommendations for dataloaders in ddp_spawn (#6762)
• pl.seed_everything will now also set the seed on the DistributedSampler (#7024)
• Changed default setting for communication of multi-node training using DDPShardedPlugin (#6937)
• trainer.tune() now returns the tuning result (#7258)
• LightningModule.from_datasets() now accepts IterableDataset instances as training datasets. (#7503)
• Changed resume_from_checkpoint warning to an error when the checkpoint file does not exist (#7075)
• Automatically set sync_batchnorm for training_type_plugin (#6536)
• Allowed training type plugin to delay optimizer creation (#6331)
• Removed ModelSummary validation from train loop on_trainer_init (#6610)
• Moved save_function to accelerator (#6689)
• Updated DeepSpeed ZeRO (#6546, #6752, #6142, #6321)
• Improved verbose logging for EarlyStopping callback (#6811)
• Run ddp_spawn dataloader checks on Windows (#6930)
• Updated mlflow with using resolve_tags (#6746)
• Moved save_hyperparameters to its own function (#7119)
• Replaced _DataModuleWrapper with __new__ (#7289)
• Reset current_fx properties on lightning module in teardown (#7247)
• Auto-set DataLoader.worker_init_fn with seed_everything (#6960)
• Remove model.trainer call inside of dataloading mixin (#7317)
• Split profilers module (#6261)
• Ensure accelerator is valid if running interactively (#5970)
• Disabled batch transfer in DP mode (#6098)

Deprecated

• Deprecated outputs in both LightningModule.on_train_epoch_end and Callback.on_train_epoch_end hooks (#7339)
• Deprecated Trainer.truncated_bptt_steps in favor of LightningModule.truncated_bptt_steps (#7323)
• Deprecated outputs in both LightningModule.on_train_epoch_end and Callback.on_train_epoch_end hooks (#7339)
• Deprecated LightningModule.grad_norm in favor of pytorch_lightning.utilities.grads.grad_norm (#7292)
• Deprecated the save_function property from the ModelCheckpoint callback (#7201)
• Deprecated LightningModule.write_predictions and LightningModule.write_predictions_dict (#7066)
• Deprecated TrainerLoggingMixin in favor of a separate utilities module for metric handling (#7180)
• Deprecated TrainerTrainingTricksMixin in favor of a separate utilities module for NaN/Inf detection for gradients and parameters (#6834)
• period has been deprecated in favor of every_n_val_epochs in the ModelCheckpoint callback (#6146)
• Deprecated trainer.running_sanity_check in favor of trainer.sanity_checking (#4945)
• Deprecated Profiler(output_filename) in favor of dirpath and filename (#6621)
• Deprecated PytorchProfiler(profiled_functions) in favor of record_functions (#6349)
• Deprecated @auto_move_data in favor of trainer.predict (#6993)
• Deprecated Callback.on_load_checkpoint(checkpoint) in favor of Callback.on_load_checkpoint(trainer, pl_module, checkpoint) (#7253)
• Deprecated metrics in favor of torchmetrics ( #6505, #6530, #6540, #6547, #6515, #6572, #6573, #6584, #6636, #6637, #6649, #6659, #7131, )
• Deprecated the LightningModule.datamodule getter and setter methods; access them through Trainer.datamodule instead (#7168)
• Deprecated the use of Trainer(gpus="i") (string) for selecting the i-th GPU; from v1.5 this will set the number of GPUs instead of the index (#6388)

Removed

• Removed the exp_save_path property from the LightningModule (#7266)
• Removed training loop explicitly calling EarlyStopping.on_validation_end if no validation is run (#7069)
• Removed automatic_optimization as a property from the training loop in favor of LightningModule.automatic_optimization (#7130)
• Removed evaluation loop legacy returns for *_epoch_end hooks (#6973)
• Removed support for passing a bool value to profiler argument of Trainer (#6164)
• Removed no return warning from val/test step (#6139)
• Removed passing a ModelCheckpoint instance to Trainer(checkpoint_callback) (#6166)
• Removed deprecated Trainer argument enable_pl_optimizer and automatic_optimization (#6163)
• Removed deprecated metrics (#6161)
  • from pytorch_lightning.metrics.functional.classification removed to_onehot, to_categorical, get_num_classes, roc, multiclass_roc, average_precision, precision_recall_curve, multiclass_precision_recall_curve
  • from pytorch_lightning.metrics.functional.reduction removed reduce, class_reduce
• Removed deprecated ModelCheckpoint arguments prefix, mode="auto" (#6162)
• Removed mode='auto' from EarlyStopping (#6167)
• Removed epoch and step arguments from ModelCheckpoint.format_checkpoint_name(), these are now included in the metrics argument (#7344)
• Removed legacy references for magic keys in the Result object (#6016)
• Removed deprecated LightningModule hparams setter (#6207)
• Removed legacy code to log or include metrics in the progress bar by returning them in a dict with the "log"/"progress_bar" magic keys. Use self.log instead (#6734)
• Removed trainer.fit() return value of 1. It has no return now (#7237)
• Removed logger_connector legacy code (#6733)
• Removed unused mixin attributes (#6487)

Fixed

• Fixed NaN errors in progress bars when training with iterable datasets with no length defined (#7306)
• Fixed attaching train and validation dataloaders when reload_dataloaders_every_epoch=True and num_sanity_val_steps=0 (#7207)
• Added a barrier in the accelerator teardown to synchronize processes before execution finishes (#6814)
• Fixed multi-node DDP sub-process launch by using local_rank instead of global_rank for main process assertion (#7061)
• Fixed incorrect removal of WORLD_SIZE environment variable in DDP training when launching with torch distributed/torchelastic (#6942)
• Made the Plugin.reduce method more consistent across all Plugins to reflect a mean-reduction by default (#6011)
• Move lightning module to correct device type when using LightningDistributedWrapper (#6070)
• Do not print top-k verbose log with ModelCheckpoint(monitor=None) (#6109)
• Fixed ModelCheckpoint(save_top_k=0, save_last=True) not saving the last checkpoint (#6136)
• Fixed .teardown(stage='fit') and .on_fit_{start,end}() getting called during trainer.test (#6386)
• Fixed LightningModule all_gather on cpu tensors (#6416)
• Fixed torch distributed not available in setup hook for DDP (#6506)
• Fixed trainer.tuner.{lr_find,scale_batch_size} not setting the Trainer state properly (#7258)
• Fixed bug where the learning rate schedulers did not follow the optimizer frequencies (#4868)
• Fixed pickle error checker to now check for pickle.PickleError to catch all pickle errors (#6917)
• Fixed a bug where the outputs object passed to LightningModule.training_epoch_end was different from the object passed to the on_train_end_epoch hook (#6969)
• Fixed a bug where the outputs passed to train_batch_end would be lists even when using a single optimizer and no truncated backprop through time steps (#6969)
• Fixed bug for trainer error handling which would cause hang for distributed training (#6864)
• Fixed self.device not returning the correct device in replicas of data-parallel (#6414)
• Fixed lr_find trying beyond num_training steps and suggesting a too high learning rate (#7076)
• Fixed logger creating incorrect version folder in DDP with repeated Trainer.fit calls (#7077)
• Fixed metric objects passed directly to self.log not being reset correctly (#7055)
• Fixed CombinedLoader in distributed settings for validation / testing (#7102)
• Fixed the save_dir in WandbLogger when the run was initiated externally (#7106)
• Fixed num_sanity_val_steps affecting reproducibility of training data shuffling (#7014)
• Fixed resetting device after fitting/evaluating/predicting (#7188)
• Fixed bug where trainer.tuner.scale_batch_size(max_trials=0) would not return the correct batch size result (#7262)
• Fixed metrics not being properly logged with precision=16 and manual_optimization (#7228)
• Fixed BaseFinetuning properly reloading optimizer_states when using resume_from_checkpoint (#6891)
• Fixed parameters_to_ignore not properly set to DDPWrapper (#7239)
• Fixed parsing of fast_dev_run=True with the built-in ArgumentParser (#7240)
• Fixed handling an IterableDataset that fails to produce a batch at the beginning of an epoch (#7294)
• Fixed LightningModule.save_hyperparameters() when attempting to save an empty container (#7268)
• Fixed apex not properly instantiated when running with ddp (#7274)
• Fixed optimizer state not moved to GPU (#7277)
• Fixed custom init args for WandbLogger (#6989)
• Fixed a bug where an error would be raised if the train dataloader sometimes produced None for a batch (#7342)
• Fixed examples ( #6600, #6638, #7096, #7246, #6357, #6476, #6294, #6373, #6088, #7398 )
• Resolved schedule step bug for PyTorch Profiler (#6674, #6681)
• Updated logic for checking TPUs availability (#6767)
• Resolve TPU miss rendezvous (#6781)
• Fixed auto-scaling mode when calling tune method on trainer (#7321)
• Fixed finetuning complex models correctly unfreezes (#6880)
• Ensure we set the eval/train flag correctly on accelerator model (#6877)
• Set better defaults for rank_zero_only.rank when training is launched with SLURM and torchelastic (#6802)
• Fixed matching the number of outputs of backward with forward for AllGatherGrad (#6625)
• Fixed the gradient_clip_algorithm has no effect (#6928)
• Fixed CUDA OOM detection and handling (#6934)
• Fixed unfreeze_and_add_param_group expects modules rather than module (#6822)
• Fixed DPP + SyncBN when move on device (#6838)
• Fixed missing arguments in lr_find call (#6784)
• Fixed set_default_tensor_type to torch.DoubleTensor with precision=64 (#7108)
• Fixed NeptuneLogger.log_text(step=None) (#7194)
• Fixed importing torchtext batch (#6365, #6323, #6211)

[1.2.9] - 2021-04-20

Fixed

• Fixed the order to call for world ranks & the root_device property in TPUSpawnPlugin (#7074)
• Fixed multi-gpu join for Horovod (#6954)
• Fixed parsing for pre-release package versions (#6999)

[1.2.8] - 2021-04-14

Added

• Added TPUSpawn + IterableDataset error message (#6875)

Fixed

• Fixed process rank not being available right away after Trainer instantiation (#6941)
• Fixed sync_dist for tpus (#6950)
• Fixed AttributeError for require_backward_grad_sync when running manual optimization with sharded plugin (#6915)
• Fixed --gpus default for parser returned by Trainer.add_argparse_args (#6898)
• Fixed TPU Spawn all gather (#6896)
• Fixed EarlyStopping logic when min_epochs or min_steps requirement is not met (#6705)
• Fixed csv extension check (#6436)
• Fixed checkpoint issue when using Horovod distributed backend (#6958)
• Fixed tensorboard exception raising (#6901)
• Fixed setting the eval/train flag correctly on accelerator model (#6983)
• Fixed DDP_SPAWN compatibility with bug_report_model.py (#6892)
• Fixed bug where BaseFinetuning.flatten_modules() was duplicating leaf node parameters (#6879)
• Set better defaults for rank_zero_only.rank when training is launched with SLURM and torchelastic:
  • Support SLURM and torchelastic global rank environment variables (#5715)
  • Remove hardcoding of local rank in accelerator connector (#6878)

[1.2.7] - 2021-04-06

Fixed

• Fixed resolve a bug with omegaconf and xm.save (#6741)

• Fixed an issue with IterableDataset when len is not defined (#6828)

• Sanitize None params during pruning (#6836)

• Enforce an epoch scheduler interval when using SWA (#6588)

• Fixed TPU Colab hang issue, post training (#6816)

• Fixed a bug where TensorBoardLogger would give a warning and not log correctly to a symbolic link save_dir (#6730)

• Fixed bug where predict could not be used when progress_bar_refresh_rate=0 (#6884)

[1.2.6] - 2021-03-30

Changed

• Changed the behavior of on_epoch_start to run at the beginning of validation & test epoch (#6498)

Removed

• Removed legacy code to include step dictionary returns in callback_metrics. Use self.log_dict instead. (#6682)

Fixed

• Fixed DummyLogger.log_hyperparams raising a TypeError when running with fast_dev_run=True (#6398)
• Fixed error on TPUs when there was no ModelCheckpoint (#6654)
• Fixed trainer.test freeze on TPUs (#6654)
• Fixed a bug where gradients were disabled after calling Trainer.predict (#6657)
• Fixed bug where no TPUs were detected in a TPU pod env (#6719)

[1.2.5] - 2021-03-23

Changed

• Update Gradient Clipping for the TPU Accelerator (#6576)
• Refactored setup for typing friendly (#6590)

Fixed

• Fixed a bug where all_gather would not work correctly with tpu_cores=8 (#6587)
• Fixed comparing required versions (#6434)
• Fixed duplicate logs appearing in console when using the python logging module (#6275)
• Added Autocast in validation, test and predict modes for Native AMP (#6565)

[1.2.4] - 2021-03-16

Changed

• Changed the default of find_unused_parameters back to True in DDP and DDP Spawn (#6438)

Fixed

• Expose DeepSpeed loss parameters to allow users to fix loss instability (#6115)
• Fixed DP reduction with collection (#6324)
• Fixed an issue where the tuner would not tune the learning rate if also tuning the batch size (#4688)
• Fixed broadcast to use PyTorch broadcast_object_list and add reduce_decision (#6410)
• Fixed logger creating directory structure too early in DDP (#6380)
• Fixed DeepSpeed additional memory use on rank 0 when default device not set early enough (#6460)
• Fixed an issue with Tuner.scale_batch_size not finding the batch size attribute in the datamodule (#5968)
• Fixed an exception in the layer summary when the model contains torch.jit scripted submodules (#6511)
• Fixed when Train loop config was run during Trainer.predict (#6541)

[1.2.3] - 2021-03-09

Fixed

• Fixed ModelPruning(make_pruning_permanent=True) pruning buffers getting removed when saved during training (#6073)
• Fixed when _stable_1d_sort to work when n >= N (#6177)
• Fixed AttributeError when logger=None on TPU (#6221)
• Fixed PyTorch Profiler with emit_nvtx (#6260)
• Fixed trainer.test from best_path hangs after calling trainer.fit (#6272)
• Fixed SingleTPU calling all_gather (#6296)
• Ensure we check DeepSpeed/Sharded in multi-node DDP (#6297
• Check LightningOptimizer doesn't delete optimizer hooks (#6305
• Resolve memory leak for evaluation (#6326
• Ensure that clip gradients is only called if the value is greater than 0 (#6330
• Fixed Trainer not resetting lightning_optimizers when calling Trainer.fit() multiple times (#6372)

[1.2.2] - 2021-03-02

Added

• Added checkpoint parameter to callback's on_save_checkpoint hook (#6072)

Changed

• Changed the order of backward, step, zero_grad to zero_grad, backward, step (#6147)
• Changed default for DeepSpeed CPU Offload to False, due to prohibitively slow speeds at smaller scale (#6262)

Fixed

• Fixed epoch level schedulers not being called when val_check_interval < 1.0 (#6075)
• Fixed multiple early stopping callbacks (#6197)
• Fixed incorrect usage of detach(), cpu(), to() (#6216)
• Fixed LBFGS optimizer support which didn't converge in automatic optimization (#6147)
• Prevent WandbLogger from dropping values (#5931)
• Fixed error thrown when using valid distributed mode in multi node (#6297

[1.2.1] - 2021-02-23

Fixed

• Fixed incorrect yield logic for the amp autocast context manager (#6080)
• Fixed priority of plugin/accelerator when setting distributed mode (#6089)
• Fixed error message for AMP + CPU incompatibility (#6107)
• Disabled batch transfer in DP mode (#6093)

[1.2.0] - 2021-02-18

Added

• Added DataType, AverageMethod and MDMCAverageMethod enum in metrics (#5657)
• Added support for summarized model total params size in megabytes (#5590)
• Added support for multiple train loaders (#1959)
• Added Accuracy metric now generalizes to Top-k accuracy for (multi-dimensional) multi-class inputs using the top_k parameter (#4838)
• Added Accuracy metric now enables the computation of subset accuracy for multi-label or multi-dimensional multi-class inputs with the subset_accuracy parameter (#4838)
• Added HammingDistance metric to compute the hamming distance (loss) (#4838)
• Added max_fpr parameter to auroc metric for computing partial auroc metric (#3790)
• Added StatScores metric to compute the number of true positives, false positives, true negatives and false negatives (#4839)
• Added R2Score metric (#5241)
• Added LambdaCallback (#5347)
• Added BackboneLambdaFinetuningCallback (#5377)
• Accelerator all_gather supports collection (#5221)
• Added image_gradients functional metric to compute the image gradients of a given input image. (#5056)
• Added MetricCollection (#4318)
• Added .clone() method to metrics (#4318)
• Added IoU class interface (#4704)
• Support to tie weights after moving model to TPU via on_post_move_to_device hook
• Added missing val/test hooks in LightningModule (#5467)
• The Recall and Precision metrics (and their functional counterparts recall and precision) can now be generalized to Recall@K and Precision@K with the use of top_k parameter (#4842)
• Added ModelPruning Callback (#5618, #5825, #6045)
• Added PyTorchProfiler (#5560)
• Added compositional metrics (#5464)
• Added Trainer method predict(...) for high performence predictions (#5579)
• Added on_before_batch_transfer and on_after_batch_transfer data hooks (#3671)
• Added AUC/AUROC class interface (#5479)
• Added PredictLoop object (#5752)
• Added QuantizationAwareTraining callback (#5706, #6040)
• Added LightningModule.configure_callbacks to enable the definition of model-specific callbacks (#5621)
• Added dim to PSNR metric for mean-squared-error reduction (#5957)
• Added promxial policy optimization template to pl_examples (#5394)
• Added log_graph to CometLogger (#5295)
• Added possibility for nested loaders (#5404)
• Added sync_step to Wandb logger (#5351)
• Added StochasticWeightAveraging callback (#5640)
• Added LightningDataModule.from_datasets(...) (#5133)
• Added PL_TORCH_DISTRIBUTED_BACKEND env variable to select backend (#5981)
• Added Trainer flag to activate Stochastic Weight Averaging (SWA) Trainer(stochastic_weight_avg=True) (#6038)
• Added DeepSpeed integration (#5954, #6042)

Changed

• Changed stat_scores metric now calculates stat scores over all classes and gains new parameters, in line with the new StatScores metric (#4839)
• Changed computer_vision_fine_tunning example to use BackboneLambdaFinetuningCallback (#5377)
• Changed automatic casting for LoggerConnector metrics (#5218)
• Changed iou [func] to allow float input (#4704)
• Metric compute() method will no longer automatically call reset() (#5409)
• Set PyTorch 1.4 as min requirements, also for testing and examples torchvision>=0.5 and torchtext>=0.5 (#5418)
• Changed callbacks argument in Trainer to allow Callback input (#5446)
• Changed the default of find_unused_parameters to False in DDP (#5185)
• Changed ModelCheckpoint version suffixes to start at 1 (#5008)
• Progress bar metrics tensors are now converted to float (#5692)
• Changed the default value for the progress_bar_refresh_rate Trainer argument in Google COLAB notebooks to 20 (#5516)
• Extended support for purely iteration-based training (#5726)
• Made LightningModule.global_rank, LightningModule.local_rank and LightningModule.logger read-only properties (#5730)
• Forced ModelCheckpoint callbacks to run after all others to guarantee all states are saved to the checkpoint (#5731)
• Refactored Accelerators and Plugins:
  • Added base classes for plugins (#5715)
  • Added parallel plugins for DP, DDP, DDPSpawn, DDP2 and Horovod (#5714)
  • Precision Plugins (#5718)
  • Added new Accelerators for CPU, GPU and TPU (#5719)
  • Added RPC and Sharded plugins (#5732)
  • Added missing LightningModule-wrapper logic to new plugins and accelerator (#5734)
  • Moved device-specific teardown logic from training loop to accelerator (#5973)
  • Moved accelerator_connector.py to the connectors subfolder (#6033)
  • Trainer only references accelerator (#6039)
  • Made parallel devices optional across all plugins (#6051)
  • Cleaning (#5948, #5949, #5950)
• Enabled self.log in callbacks (#5094)
• Renamed xxx_AVAILABLE as protected (#5082)
• Unified module names in Utils (#5199)
• Separated utils: imports & enums (#5256 #5874)
• Refactor: clean trainer device & distributed getters (#5300)
• Simplified training phase as LightningEnum (#5419)
• Updated metrics to use LightningEnum (#5689)
• Changed the seq of on_train_batch_end, on_batch_end & on_train_epoch_end, on_epoch_end hooks (#5688)
• Refactored setup_training and remove test_mode (#5388)
• Disabled training with zero num_training_batches when insufficient limit_train_batches (#5703)
• Refactored EpochResultStore (#5522)
• Update lr_finder to check for attribute if not running fast_dev_run (#5990)
• LightningOptimizer manual optimizer is more flexible and expose toggle_model (#5771)
• MlflowLogger limit parameter value length to 250 char (#5893)
• Re-introduced fix for Hydra directory sync with multiple process (#5993)

Deprecated

• Function stat_scores_multiple_classes is deprecated in favor of stat_scores (#4839)
• Moved accelerators and plugins to its legacy pkg (#5645)
• Deprecated LightningDistributedDataParallel in favor of new wrapper module LightningDistributedModule (#5185)
• Deprecated LightningDataParallel in favor of new wrapper module LightningParallelModule (#5670)
• Renamed utils modules (#5199)
  • argparse_utils >> argparse
  • model_utils >> model_helpers
  • warning_utils >> warnings
  • xla_device_utils >> xla_device
• Deprecated using 'val_loss' to set the ModelCheckpoint monitor (#6012)
• Deprecated .get_model() with explicit .lightning_module property (#6035)
• Deprecated Trainer attribute accelerator_backend in favor of accelerator (#6034)

Removed

• Removed deprecated checkpoint argument filepath (#5321)
• Removed deprecated Fbeta, f1_score and fbeta_score metrics (#5322)
• Removed deprecated TrainResult (#5323)
• Removed deprecated EvalResult (#5633)
• Removed LoggerStages (#5673)

Fixed

• Fixed distributed setting and ddp_cpu only with num_processes>1 (#5297)
• Fixed num_workers for Windows example (#5375)
• Fixed loading yaml (#5619)
• Fixed support custom DataLoader with DDP if they can be re-instantiated (#5745)
• Fixed repeated .fit() calls ignore max_steps iteration bound (#5936)
• Fixed throwing MisconfigurationError on unknown mode (#5255)
• Resolve bug with Finetuning (#5744)
• Fixed ModelCheckpoint race condition in file existence check (#5155)
• Fixed some compatibility with PyTorch 1.8 (#5864)
• Fixed forward cache (#5895)
• Fixed recursive detach of tensors to CPU (#6007)
• Fixed passing wrong strings for scheduler interval doesn't throw an error (#5923)
• Fixed wrong requires_grad state after return None with multiple optimizers (#5738)
• Fixed add on_epoch_end hook at the end of validation, test epoch (#5986)
• Fixed missing process_dataloader call for TPUSpawn when in distributed mode (#6015)
• Fixed progress bar flickering by appending 0 to floats/strings (#6009)
• Fixed synchronization issues with TPU training (#6027)
• Fixed hparams.yaml saved twice when using TensorBoardLogger (#5953)
• Fixed basic examples (#5912, #5985)
• Fixed fairscale compatible with PT 1.8 (#5996)
• Ensured process_dataloader is called when tpu_cores > 1 to use Parallel DataLoader (#6015)
• Attempted SLURM auto resume call when non-shell call fails (#6002)
• Fixed wrapping optimizers upon assignment (#6006)
• Fixed allowing hashing of metrics with lists in their state (#5939)

[1.1.8] - 2021-02-08

Fixed

• Separate epoch validation from step validation (#5208)
• Fixed toggle_optimizers not handling all optimizer parameters (#5775)

[1.1.7] - 2021-02-03

Fixed

• Fixed TensorBoardLogger not closing SummaryWriter on finalize (#5696)
• Fixed filtering of pytorch "unsqueeze" warning when using DP (#5622)
• Fixed num_classes argument in F1 metric (#5663)
• Fixed log_dir property (#5537)
• Fixed a race condition in ModelCheckpoint when checking if a checkpoint file exists (#5144)
• Remove unnecessary intermediate layers in Dockerfiles (#5697)
• Fixed auto learning rate ordering (#5638)

[1.1.6] - 2021-01-26

Changed

• Increased TPU check timeout from 20s to 100s (#5598)
• Ignored step param in Neptune logger's log_metric method (#5510)
• Pass batch outputs to on_train_batch_end instead of epoch_end outputs (#4369)

Fixed

• Fixed toggle_optimizer to reset requires_grad state (#5574)
• Fixed FileNotFoundError for best checkpoint when using DDP with Hydra (#5629)
• Fixed an error when logging a progress bar metric with a reserved name (#5620)
• Fixed Metric's state_dict not included when child modules (#5614)
• Fixed Neptune logger creating multiple experiments when GPUs > 1 (#3256)
• Fixed duplicate logs appearing in console when using the python logging module (#5509)
• Fixed tensor printing in trainer.test() (#5138)
• Fixed not using dataloader when hparams present (#4559)

[1.1.5] - 2021-01-19

Fixed

• Fixed a visual bug in the progress bar display initialization (#4579)
• Fixed logging on_train_batch_end in a callback with multiple optimizers (#5521)
• Fixed reinit_scheduler_properties with correct optimizer (#5519)
• Fixed val_check_interval with fast_dev_run (#5540)

[1.1.4] - 2021-01-12

Added

• Add automatic optimization property setter to lightning module (#5169)

Changed

• Changed deprecated enable_pl_optimizer=True (#5244)

Fixed

• Fixed transfer_batch_to_device for DDP with len(devices_ids) == 1 (#5195)
• Logging only on not should_accumulate() during training (#5417)
• Resolve interpolation bug with Hydra (#5406)
• Check environ before selecting a seed to prevent warning message (#4743)
• Fixed signature mismatch in model_to_device of DDPCPUHPCAccelerator (#5505)

[1.1.3] - 2021-01-05

Added

• Added a check for optimizer attached to lr_scheduler (#5338)
• Added support for passing non-existing filepaths to resume_from_checkpoint (#4402)

Changed

• Skip restore from resume_from_checkpoint while testing (#5161)
• Allowed log_momentum for adaptive optimizers in LearningRateMonitor (#5333)
• Disabled checkpointing, earlystopping and logging with fast_dev_run (#5277)
• Distributed group defaults to WORLD if None (#5125)

Fixed

• Fixed trainer.test returning non-test metrics (#5214)
• Fixed metric state reset (#5273)
• Fixed --num-nodes on DDPSequentialPlugin (#5327)
• Fixed invalid value for weights_summary (#5296)
• Fixed Trainer.test not using the latest best_model_path (#5161)
• Fixed existence check for hparams not using underlying filesystem (#5250)
• Fixed LightningOptimizer AMP bug (#5191)
• Fixed casted key to string in _flatten_dict (#5354)

[1.1.2] - 2020-12-23

Added

• Support number for logging with sync_dist=True (#5080)
• Added offset logging step when resuming for Wandb logger (#5050)

Removed

• enable_pl_optimizer=False by default to temporarily fix AMP issues (#5163)

Fixed

• Metric reduction with Logging (#5150)
• Remove nan loss in manual optimization (#5121)
• Un-balanced logging properly supported (#5119)
• Fix hanging in DDP HPC accelerators (#5157)
• Fix reset TensorRunningAccum (#5106)
• Updated DALIClassificationLoader to not use deprecated arguments (#4925)
• Corrected call to torch.no_grad (#5124)

[1.1.1] - 2020-12-15

Added

• Add a notebook example to reach a quick baseline of ~94% accuracy on CIFAR10 using Resnet in Lightning (#4818)

Changed

• Simplify accelerator steps (#5015)
• Refactor load in checkpoint connector (#4593)
• Fixed the saved filename in ModelCheckpoint when it already exists (#4861)

Removed

• Drop duplicate metrics (#5014)
• Remove beta arg from F1 class and functional (#5076)

Fixed

• Fixed trainer by default None in DDPAccelerator (#4915)
• Fixed LightningOptimizer to expose optimizer attributes (#5095)
• Do not warn when the name key is used in the lr_scheduler dict (#5057)
• Check if optimizer supports closure (#4981)
• Add deprecated metric utility functions back to functional ( #5067, #5068)
• Allow any input in to_onnx and to_torchscript (#4378)
• Fixed DDPHPCAccelerator hangs in DDP construction by calling init_device (#5157)

[1.1.0] - 2020-12-09

Added

• Added "monitor" key to saved ModelCheckpoints (#4383)
• Added ConfusionMatrix class interface (#4348)
• Added multiclass AUROC metric (#4236)
• Added global step indexing to the checkpoint name for a better sub-epoch checkpointing experience (#3807)
• Added optimizer hooks in callbacks (#4379)
• Added option to log momentum (#4384)
• Added current_score to ModelCheckpoint.on_save_checkpoint (#4721)
• Added logging using self.log in train and evaluation for epoch end hooks ( #4552, #4495, #4439, #4684, #4913)
• Added ability for DDP plugin to modify optimizer state saving (#4675)
• Added prefix argument in loggers (#4557)
• Added printing of total num of params, trainable and non-trainable params in ModelSummary (#4521)
• Added PrecisionRecallCurve, ROC, AveragePrecision class metric (#4549)
• Added custom Apex and NativeAMP as Precision plugins (#4355)
• Added DALI MNIST example (#3721)
• Added sharded plugin for DDP for multi-gpu training memory optimizations ( #4639, #4686, #4737, #4773)
• Added experiment_id to the NeptuneLogger (#3462)
• Added Pytorch Geometric integration example with Lightning (#4568)
• Added all_gather method to LightningModule which allows gradient based tensor synchronizations for use-cases such as negative sampling. (#5012)
• Enabled self.log in most functions (#4969)
• Added changeable extension variable for ModelCheckpoint (#4977)

Changed

• Tuner algorithms will be skipped if fast_dev_run=True (#3903)
• WandbLogger does not force wandb reinit arg to True anymore and creates a run only when needed (#4648)
• Changed automatic_optimization to be a model attribute (#4602)
• Changed Simple Profiler report to order by percentage time spent + num calls (#4880)
• Simplify optimization Logic (#4984)
• Classification metrics overhaul (#4837)
• Updated fast_dev_run to accept integer representing num_batches (#4629)
• Refactored optimizer (#4658)

Deprecated

• Deprecated prefix argument in ModelCheckpoint (#4765)
• Deprecated the old way of assigning hyper-parameters through self.hparams = ... (#4813)
• Deprecated mode='auto' from ModelCheckpoint and EarlyStopping (#4695)

Removed

• Removed reorder parameter of the auc metric (#5004)
• Removed multiclass_roc and multiclass_precision_recall_curve, use roc and precision_recall_curve instead (#4549)

Fixed

• Added feature to move tensors to CPU before saving (#4309)
• Fixed LoggerConnector to have logged metrics on root device in DP (#4138)
• Auto convert tensors to contiguous format when gather_all (#4907)
• Fixed PYTHONPATH for ddp test model (#4528)
• Fixed allowing logger to support indexing (#4595)
• Fixed DDP and manual_optimization (#4976)

[1.0.8] - 2020-11-24

Added

• Added casting to python types for numpy scalars when logging hparams (#4647)
• Added warning when progress bar refresh rate is less than 20 on Google Colab to prevent crashing (#4654)
• Added F1 class metric (#4656)

Changed

• Consistently use step=trainer.global_step in LearningRateMonitor independently of logging_interval (#4376)
• Metric states are no longer as default added to state_dict (#4685)
• Renamed class metric Fbeta >> FBeta (#4656)
• Model summary: add 1 decimal place (#4745)
• Do not override PYTHONWARNINGS (#4700)
• Changed init_ddp_connection moved from DDP to DDPPlugin (#4407)

Fixed

• Fixed checkpoint hparams dict casting when omegaconf is available (#4770)
• Fixed incomplete progress bars when total batches not divisible by refresh rate (#4577)
• Updated SSIM metric (#4566)
• Fixed batch_arg_name - add batch_arg_name to all calls to _adjust_batch_sizebug (#4812)
• Fixed torchtext data to GPU (#4785)
• Fixed a crash bug in MLFlow logger (#4716)

[1.0.7] - 2020-11-17

Added

• Added lambda closure to manual_optimizer_step (#4618)

Changed

• Change Metrics persistent default mode to False (#4685)
• LoggerConnector log_metrics will use total_batch_idx instead of global_step when logging on training step (#4738)

Fixed

• Prevent crash if sync_dist=True on CPU (#4626)
• Fixed average pbar Metrics (#4534)
• Fixed setup callback hook to correctly pass the LightningModule through (#4608)
• Allowing decorate model init with saving hparams inside (#4662)
• Fixed split_idx set by LoggerConnector in on_trainer_init to Trainer (#4697)

[1.0.6] - 2020-11-11

Added

• Added metrics aggregation in Horovod and fixed early stopping (#3775)
• Added manual_optimizer_step which work with AMP Native and accumulated_grad_batches (#4485)
• Added persistent(mode) method to metrics, to enable and disable metric states being added to state_dict (#4482)
• Added congratulations at the end of our notebooks (#4555)
• Added parameters move_metrics_to_cpu in Trainer to disable gpu leak (#4592)

Changed

• Changed fsspec to tuner (#4458)
• Unify SLURM/TorchElastic under backend plugin (#4578, #4580, #4581, #4582, #4583)

Fixed

• Fixed feature-lack in hpc_load (#4526)
• Fixed metrics states being overridden in DDP mode (#4482)
• Fixed lightning_getattr, lightning_hasattr not finding the correct attributes in datamodule (#4347)
• Fixed automatic optimization AMP by manual_optimization_step (#4485)
• Replace MisconfigurationException with warning in ModelCheckpoint Callback (#4560)
• Fixed logged keys in mlflow logger (#4412)
• Fixed is_picklable by catching AttributeError (#4508)
• Fixed multi test dataloaders dict AttributeError error (#4480)
• Fixed show progress bar only for progress_rank 0 on DDP_SLURM (#4437)

[1.0.5] - 2020-11-03

Added

• Added PyTorch 1.7 Stable support (#3821)
• Added timeout for tpu_device_exists to ensure process does not hang indefinitely (#4340)

Changed

• W&B log in sync with Trainer step (#4405)
• Hook on_after_backward is called only when optimizer_step is being called (#4439)
• Moved track_and_norm_grad into training loop and called only when optimizer_step is being called (#4439)
• Changed type checker with explicit cast of ref_model object (#4457)
• Changed distributed_backend -> accelerator (#4429)

Deprecated

• Deprecated passing ModelCheckpoint instance to checkpoint_callback Trainer argument (#4336)

Fixed

• Disable saving checkpoints if not trained (#4372)
• Fixed error using auto_select_gpus=True with gpus=-1 (#4209)
• Disabled training when limit_train_batches=0 (#4371)
• Fixed that metrics do not store computational graph for all seen data (#4313)
• Fixed AMP unscale for on_after_backward (#4439)
• Fixed TorchScript export when module includes Metrics (#4428)
• Fixed TorchScript trace method's data to device and docstring (#4360)
• Fixed CSV logger warning (#4419)
• Fixed skip DDP parameter sync (#4301)
• Fixed WandbLogger _sanitize_callable function (#4422)
• Fixed AMP Native _unscale gradient (#4441)

[1.0.4] - 2020-10-27

Added

• Added dirpath and filename parameter in ModelCheckpoint (#4213)
• Added plugins docs and DDPPlugin to customize ddp across all accelerators (#4258)
• Added strict option to the scheduler dictionary (#3586)
• Added fsspec support for profilers (#4162)
• Added autogenerated helptext to Trainer.add_argparse_args (#4344)
• Added support for string values in Trainer's profiler parameter (#3656)
• Added optimizer_closure to optimizer.step when supported (#4190)
• Added unification of regression metrics (#4166)
• Added checkpoint load from Bytes (#4314)

Changed

• Improved error messages for invalid configure_optimizers returns (#3587)
• Allow changing the logged step value in validation_step (#4130)
• Allow setting replace_sampler_ddp=True with a distributed sampler already added (#4273)
• Fixed santized parameters for WandbLogger.log_hyperparams (#4320)

Deprecated

• Deprecated filepath in ModelCheckpoint (#4213)
• Deprecated reorder parameter of the auc metric (#4237)
• Deprecated bool values in Trainer's profiler parameter (#3656)

Fixed

• Fixed setting device ids in DDP (#4297)
• Fixed synchronization of best model path in ddp_accelerator (#4323)
• Fixed WandbLogger not uploading checkpoint artifacts at the end of training (#4341)
• Fixed FBeta computation (#4183)
• Fixed accumulation across batches has completed before breaking training loop (#4278)
• Fixed ModelCheckpoint don't increase current_epoch and global_step when not training (#4291)
• Fixed COMET_EXPERIMENT_KEY environment variable usage in comet logger (#4230)

[1.0.3] - 2020-10-20

Added

• Added persistent flag to Metric.add_state (#4195)

Changed

• Used checkpoint_connector.hpc_save in SLURM (#4217)
• Moved base req. to root (#4219)

Fixed

• Fixed hparams assign in init (#4189)
• Fixed overwrite check for model hooks (#4010)

[1.0.2] - 2020-10-15

Added

• Added trace functionality to the function to_torchscript (#4142)

Changed

• Called on_load_checkpoint before loading state_dict (#4057)

Removed

• Removed duplicate metric vs step log for train loop (#4173)

Fixed

• Fixed the self.log problem in validation_step() (#4169)
• Fixed hparams saving - save the state when save_hyperparameters() is called [in __init__] (#4163)
• Fixed runtime failure while exporting hparams to yaml (#4158)

[1.0.1] - 2020-10-14

Added

• Added getstate/setstate method for torch.save serialization (#4127)

[1.0.0] - 2020-10-13

Added

• Added Explained Variance Metric + metric fix (#4013)
• Added Metric <-> Lightning Module integration tests (#4008)
• Added parsing OS env vars in Trainer (#4022)
• Added classification metrics (#4043)
• Updated explained variance metric (#4024)
• Enabled plugins (#4041)
• Enabled custom clusters (#4048)
• Enabled passing in custom accelerators (#4050)
• Added LightningModule.toggle_optimizer (#4058)
• Added LightningModule.manual_backward (#4063)
• Added output argument to *_batch_end hooks (#3965, #3966)
• Added output argument to *_epoch_end hooks (#3967)

Changed

• Integrated metrics API with self.log (#3961)
• Decoupled Apex (#4052, #4054, #4055, #4056, #4058, #4060, #4061, #4062, #4063, #4064, #4065)
• Renamed all backends to Accelerator (#4066)
• Enabled manual returns (#4089)

Removed

• Removed support for EvalResult and TrainResult (#3968)
• Removed deprecated trainer flags: overfit_pct, log_save_interval, row_log_interval (#3969)
• Removed deprecated early_stop_callback (#3982)
• Removed deprecated model hooks (#3980)
• Removed deprecated callbacks (#3979)
• Removed trainer argument in LightningModule.backward #4056)

Fixed

• Fixed current_epoch property update to reflect true epoch number inside LightningDataModule, when reload_dataloaders_every_epoch=True. (#3974)
• Fixed to print scaler value in progress bar (#4053)
• Fixed mismatch between docstring and code regarding when on_load_checkpoint hook is called (#3996)

[0.10.0] - 2020-10-07

Added

• Added new Metrics API. (#3868, #3921)
• Enable PyTorch 1.7 compatibility (#3541)
• Added LightningModule.to_torchscript to support exporting as ScriptModule (#3258)
• Added warning when dropping unpicklable hparams (#2874)
• Added EMB similarity (#3349)
• Added ModelCheckpoint.to_yaml method (#3048)
• Allow ModelCheckpoint monitor to be None, meaning it will always save (#3630)
• Disabled optimizers setup during testing (#3059)
• Added support for datamodules to save and load checkpoints when training (#3563)
• Added support for datamodule in learning rate finder (#3425)
• Added gradient clip test for native AMP (#3754)
• Added dist lib to enable syncing anything across devices (#3762)
• Added broadcast to TPUBackend (#3814)
• Added XLADeviceUtils class to check XLA device type (#3274)

Changed

• Refactored accelerator backends:
  • moved TPU xxx_step to backend (#3118)
  • refactored DDP backend forward (#3119)
  • refactored GPU backend __step (#3120)
  • refactored Horovod backend (#3121, #3122)
  • remove obscure forward call in eval + CPU backend ___step (#3123)
  • reduced all simplified forward (#3126)
  • added hook base method (#3127)
  • refactor eval loop to use hooks - use test_mode for if so we can split later (#3129)
  • moved ___step_end hooks (#3130)
  • training forward refactor (#3134)
  • training AMP scaling refactor (#3135)
  • eval step scaling factor (#3136)
  • add eval loop object to streamline eval loop (#3138)
  • refactored dataloader process hook (#3139)
  • refactored inner eval loop (#3141)
  • final inner eval loop hooks (#3154)
  • clean up hooks in run_evaluation (#3156)
  • clean up data reset (#3161)
  • expand eval loop out (#3165)
  • moved hooks around in eval loop (#3195)
  • remove _evaluate fx (#3197)
  • Trainer.fit hook clean up (#3198)
  • DDPs train hooks (#3203)
  • refactor DDP backend (#3204, #3207, #3208, #3209, #3210)
  • reduced accelerator selection (#3211)
  • group prepare data hook (#3212)
  • added data connector (#3285)
  • modular is_overridden (#3290)
  • adding Trainer.tune() (#3293)
  • move run_pretrain_routine -> setup_training (#3294)
  • move train outside of setup training (#3297)
  • move prepare_data to data connector (#3307)
  • moved accelerator router (#3309)
  • train loop refactor - moving train loop to own object (#3310, #3312, #3313, #3314)
  • duplicate data interface definition up into DataHooks class (#3344)
  • inner train loop (#3359, #3361, #3362, #3363, #3365, #3366, #3367, #3368, #3369, #3370, #3371, #3372, #3373, #3374, #3375, #3376, #3385, #3388, #3397)
  • all logging related calls in a connector (#3395)
  • device parser (#3400, #3405)
  • added model connector (#3407)
  • moved eval loop logging to loggers (#3408)
  • moved eval loop (#3412#3408)
  • trainer/separate argparse (#3421, #3428, #3432)
  • move lr_finder (#3434)
  • organize args (##3435, #3442, #3447, #3448, #3449, #3456)
  • move specific accelerator code (#3457)
  • group connectors (#3472)
  • accelerator connector methods x/n (#3469, #3470, #3474)
  • merge backends x/n (#3476, #3477, #3478, #3480, #3482)
  • apex plugin (#3502)
  • precision plugins (#3504)
  • Result - make monitor default to checkpoint_on to simplify (#3571)
  • reference to the Trainer on the LightningDataModule (#3684)
  • add .log to lightning module (#3686, #3699, #3701, #3704, #3715)
  • enable tracking original metric when step and epoch are both true (#3685)
  • deprecated results obj, added support for simpler comms (#3681)
  • move backends back to individual files (#3712)
  • fixes logging for eval steps (#3763)
  • decoupled DDP, DDP spawn (#3733, #3766, #3767, #3774, #3802, #3806, #3817, #3819, #3927)
  • remove weight loading hack for ddp_cpu (#3808)
  • separate torchelastic from DDP (#3810)
  • separate SLURM from DDP (#3809)
  • decoupled DDP2 (#3816)
  • bug fix with logging val epoch end + monitor (#3812)
  • callback system and init DDP (#3836)
  • adding compute environments (#3837, #3842)
  • epoch can now log independently (#3843)
  • test selecting the correct backend. temp backends while slurm and TorchElastic are decoupled (#3848)
  • fixed init_slurm_connection causing hostname errors (#3856)
  • moves init apex from LM to apex connector (#3923)
  • moves sync bn to each backend (#3925)
  • moves configure ddp to each backend (#3924)
• Deprecation warning (#3844)
• Changed LearningRateLogger to LearningRateMonitor (#3251)
• Used fsspec instead of gfile for all IO (#3320)
  • Swaped torch.load for fsspec load in DDP spawn backend (#3787)
  • Swaped torch.load for fsspec load in cloud_io loading (#3692)
  • Added support for to_disk() to use remote filepaths with fsspec (#3930)
  • Updated model_checkpoint's to_yaml to use fsspec open (#3801)
  • Fixed fsspec is inconsistent when doing fs.ls (#3805)
• Refactor GPUStatsMonitor to improve training speed (#3257)
• Changed IoU score behavior for classes absent in target and pred (#3098)
• Changed IoU remove_bg bool to ignore_index optional int (#3098)
• Changed defaults of save_top_k and save_last to None in ModelCheckpoint (#3680)
• row_log_interval and log_save_interval are now based on training loop's global_step instead of epoch-internal batch index (#3667)
• Silenced some warnings. verified ddp refactors (#3483)
• Cleaning up stale logger tests (#3490)
• Allow ModelCheckpoint monitor to be None (#3633)
• Enable None model checkpoint default (#3669)
• Skipped best_model_path if checkpoint_callback is None (#2962)
• Used raise .. from .. to explicitly chain exceptions (#3750)
• Mocking loggers (#3596, #3617, #3851, #3859, #3884, #3853, #3910, #3889, #3926)
• Write predictions in LightningModule instead of EvalResult #3882

Deprecated

• Deprecated TrainResult and EvalResult, use self.log and self.write from the LightningModule to log metrics and write predictions. training_step can now only return a scalar (for the loss) or a dictionary with anything you want. (#3681)
• Deprecate early_stop_callback Trainer argument (#3845)
• Rename Trainer arguments row_log_interval >> log_every_n_steps and log_save_interval >> flush_logs_every_n_steps (#3748)

Removed

• Removed experimental Metric API (#3943, #3949, #3946), listed changes before final removal:
  • Added EmbeddingSimilarity metric (#3349, #3358)
  • Added hooks to metric module interface (#2528)
  • Added error when AUROC metric is used for multiclass problems (#3350)
  • Fixed ModelCheckpoint with save_top_k=-1 option not tracking the best models when a monitor metric is available (#3735)
  • Fixed counter-intuitive error being thrown in Accuracy metric for zero target tensor (#3764)
  • Fixed aggregation of metrics (#3517)
  • Fixed Metric aggregation (#3321)
  • Fixed RMSLE metric (#3188)
  • Renamed reduction to class_reduction in classification metrics (#3322)
  • Changed class_reduction similar to sklearn for classification metrics (#3322)
  • Renaming of precision recall metric (#3308)

Fixed

• Fixed on_train_batch_start hook to end epoch early (#3700)
• Fixed num_sanity_val_steps is clipped to limit_val_batches (#2917)
• Fixed ONNX model save on GPU (#3145)
• Fixed GpuUsageLogger to work on different platforms (#3008)
• Fixed auto-scale batch size not dumping auto_lr_find parameter (#3151)
• Fixed batch_outputs with optimizer frequencies (#3229)
• Fixed setting batch size in LightningModule.datamodule when using auto_scale_batch_size (#3266)
• Fixed Horovod distributed backend compatibility with native AMP (#3404)
• Fixed batch size auto scaling exceeding the size of the dataset (#3271)
• Fixed getting experiment_id from MLFlow only once instead of each training loop (#3394)
• Fixed overfit_batches which now correctly disables shuffling for the training loader. (#3501)
• Fixed gradient norm tracking for row_log_interval > 1 (#3489)
• Fixed ModelCheckpoint name formatting (#3164)
• Fixed example implementation of AutoEncoder (#3190)
• Fixed invalid paths when remote logging with TensorBoard (#3236)
• Fixed change t() to transpose() as XLA devices do not support .t() on 1-dim tensor (#3252)
• Fixed (weights only) checkpoints loading without PL (#3287)
• Fixed gather_all_tensors cross GPUs in DDP (#3319)
• Fixed CometML save dir (#3419)
• Fixed forward key metrics (#3467)
• Fixed normalize mode at confusion matrix (replace NaNs with zeros) (#3465)
• Fixed global step increment in training loop when training_epoch_end hook is used (#3673)
• Fixed dataloader shuffling not getting turned off with overfit_batches > 0 and distributed_backend = "ddp" (#3534)
• Fixed determinism in DDPSpawnBackend when using seed_everything in main process (#3335)
• Fixed ModelCheckpoint period to actually save every period epochs (#3630)
• Fixed val_progress_bar total with num_sanity_val_steps (#3751)
• Fixed Tuner dump: add current_epoch to dumped_params (#3261)
• Fixed current_epoch and global_step properties mismatch between Trainer and LightningModule (#3785)
• Fixed learning rate scheduler for optimizers with internal state (#3897)
• Fixed tbptt_reduce_fx when non-floating tensors are logged (#3796)
• Fixed model checkpoint frequency (#3852)
• Fixed logging non-tensor scalar with result breaks subsequent epoch aggregation (#3855)
• Fixed TrainerEvaluationLoopMixin activates model.train() at the end (#3858)
• Fixed overfit_batches when using with multiple val/test_dataloaders (#3857)
• Fixed enables training_step to return None (#3862)
• Fixed init nan for checkpointing (#3863)
• Fixed for load_from_checkpoint (#2776)
• Fixes incorrect batch_sizes when Dataloader returns a dict with multiple tensors (#3668)
• Fixed unexpected signature for validation_step (#3947)

[0.9.0] - 2020-08-20

Added

• Added SyncBN for DDP (#2801, #2838)
• Added basic CSVLogger (#2721)
• Added SSIM metrics (#2671)
• Added BLEU metrics (#2535)
• Added support to export a model to ONNX format (#2596)
• Added support for Trainer(num_sanity_val_steps=-1) to check all validation data before training (#2246)
• Added struct. output:
  • tests for val loop flow (#2605)
  • EvalResult support for train and val. loop (#2615, #2651)
  • weighted average in results obj (#2930)
  • fix result obj DP auto reduce (#3013)
• Added class LightningDataModule (#2668)
• Added support for PyTorch 1.6 (#2745)
• Added call DataModule hooks implicitly in trainer (#2755)
• Added support for Mean in DDP Sync (#2568)
• Added remaining sklearn metrics: AveragePrecision, BalancedAccuracy, CohenKappaScore, DCG, Hamming, Hinge, Jaccard, MeanAbsoluteError, MeanSquaredError, MeanSquaredLogError, MedianAbsoluteError, R2Score, MeanPoissonDeviance, MeanGammaDeviance, MeanTweedieDeviance, ExplainedVariance (#2562)
• Added support for limit_{mode}_batches (int) to work with infinite dataloader (IterableDataset) (#2840)
• Added support returning python scalars in DP (#1935)
• Added support to Tensorboard logger for OmegaConf hparams (#2846)
• Added tracking of basic states in Trainer (#2541)
• Tracks all outputs including TBPTT and multiple optimizers (#2890)
• Added GPU Usage Logger (#2932)
• Added strict=False for load_from_checkpoint (#2819)
• Added saving test predictions on multiple GPUs (#2926)
• Auto log the computational graph for loggers that support this (#3003)
• Added warning when changing monitor and using results obj (#3014)
• Added a hook transfer_batch_to_device to the LightningDataModule (#3038)

Changed

• Truncated long version numbers in progress bar (#2594)
• Enabling val/test loop disabling (#2692)
• Refactored into accelerator module:
  • GPU training (#2704)
  • TPU training (#2708)
  • DDP(2) backend (#2796)
  • Retrieve last logged val from result by key (#3049)
• Using .comet.config file for CometLogger (#1913)
• Updated hooks arguments - breaking for setup and teardown (#2850)
• Using gfile to support remote directories (#2164)
• Moved optimizer creation after device placement for DDP backends (#2904)
• Support **DictConfig for hparam serialization (#2519)
• Removed callback metrics from test results obj (#2994)
• Re-enabled naming metrics in ckpt name (#3060)
• Changed progress bar epoch counting to start from 0 (#3061)

Deprecated

• Deprecated Trainer attribute ckpt_path, which will now be set by weights_save_path (#2681)

Removed

• Removed deprecated: (#2760)
  • core decorator data_loader
  • Module hook on_sanity_check_start and loading load_from_metrics
  • package pytorch_lightning.logging
  • Trainer arguments: show_progress_bar, num_tpu_cores, use_amp, print_nan_grads
  • LR Finder argument num_accumulation_steps

Fixed

• Fixed accumulate_grad_batches for last batch (#2853)
• Fixed setup call while testing (#2624)
• Fixed local rank zero casting (#2640)
• Fixed single scalar return from training (#2587)
• Fixed Horovod backend to scale LR schedlers with the optimizer (#2626)
• Fixed dtype and device properties not getting updated in submodules (#2657)
• Fixed fast_dev_run to run for all dataloaders (#2581)
• Fixed save_dir in loggers getting ignored by default value of weights_save_path when user did not specify weights_save_path (#2681)
• Fixed weights_save_path getting ignored when logger=False is passed to Trainer (#2681)
• Fixed TPU multi-core and Float16 (#2632)
• Fixed test metrics not being logged with LoggerCollection (#2723)
• Fixed data transfer to device when using torchtext.data.Field and include_lengths is True (#2689)
• Fixed shuffle argument for distributed sampler (#2789)
• Fixed logging interval (#2694)
• Fixed loss value in the progress bar is wrong when accumulate_grad_batches > 1 (#2738)
• Fixed correct CWD for ddp sub-processes when using Hydra (#2719)
• Fixed selecting GPUs using CUDA_VISIBLE_DEVICES (#2739)
• Fixed false num_classes warning in metrics (#2781)
• Fixed shell injection vulnerability in subprocess call (#2786)
• Fixed LR finder and hparams compatibility (#2821)
• Fixed ModelCheckpoint not saving the latest information when save_last=True (#2881)
• Fixed ImageNet example: learning rate scheduler, number of workers and batch size when using DDP (#2889)
• Fixed apex gradient clipping (#2829)
• Fixed save apex scaler states (#2828)
• Fixed a model loading issue with inheritance and variable positional arguments (#2911)
• Fixed passing non_blocking=True when transferring a batch object that does not support it (#2910)
• Fixed checkpointing to remote file paths (#2925)
• Fixed adding val step argument to metrics (#2986)
• Fixed an issue that caused Trainer.test() to stall in ddp mode (#2997)
• Fixed gathering of results with tensors of varying shape (#3020)
• Fixed batch size auto-scaling feature to set the new value on the correct model attribute (#3043)
• Fixed automatic batch scaling not working with half precision (#3045)
• Fixed setting device to root gpu (#3042)

[0.8.5] - 2020-07-09

Added

• Added a PSNR metric: peak signal-to-noise ratio (#2483)
• Added functional regression metrics (#2492)

Removed

• Removed auto val reduce (#2462)

Fixed

• Flattening Wandb Hyperparameters (#2459)
• Fixed using the same DDP python interpreter and actually running (#2482)
• Fixed model summary input type conversion for models that have input dtype different from model parameters (#2510)
• Made TensorBoardLogger and CometLogger pickleable (#2518)
• Fixed a problem with MLflowLogger creating multiple run folders (#2502)
• Fixed global_step increment (#2455)
• Fixed TPU hanging example (#2488)
• Fixed argparse default value bug (#2526)
• Fixed Dice and IoU to avoid NaN by adding small eps (#2545)
• Fixed accumulate gradients schedule at epoch 0 (continued) (#2513)
• Fixed Trainer .fit() returning last not best weights in "ddp_spawn" (#2565)
• Fixed passing (do not pass) TPU weights back on test (#2566)
• Fixed DDP tests and .test() (#2512, #2570)

[0.8.4] - 2020-07-01

Added

• Added reduce ddp results on eval (#2434)
• Added a warning when an IterableDataset has __len__ defined (#2437)

Changed

• Enabled no returns from eval (#2446)

Fixed

• Fixes train outputs (#2428)
• Fixes Conda dependencies (#2412)
• Fixed Apex scaling with decoupled backward (#2433)
• Fixed crashing or wrong displaying progressbar because of missing ipywidgets (#2417)
• Fixed TPU saving dir (fc26078e, 04e68f02)
• Fixed logging on rank 0 only (#2425)

[0.8.3] - 2020-06-29

Fixed

• Fixed AMP wrong call (593837e)
• Fixed batch typo (92d1e75)

[0.8.2] - 2020-06-28

Added

• Added TorchText support for moving data to GPU (#2379)

Changed

• Changed epoch indexing from 0 instead of 1 (#2289)
• Refactor Model backward (#2276)
• Refactored training_batch + tests to verify correctness (#2327, #2328)
• Refactored training loop (#2336)
• Made optimization steps for hooks (#2363)
• Changed default apex level to 'O2' (#2362)

Removed

• Moved TrainsLogger to Bolts (#2384)

Fixed

• Fixed parsing TPU arguments and TPU tests (#2094)
• Fixed number batches in case of multiple dataloaders and limit_{*}_batches (#1920, #2226)
• Fixed an issue with forward hooks not being removed after model summary (#2298)
• Fix for load_from_checkpoint() not working with absolute path on Windows (#2294)
• Fixed an issue how _has_len handles NotImplementedError e.g. raised by torchtext.data.Iterator (#2293), (#2307)
• Fixed average_precision metric (#2319)
• Fixed ROC metric for CUDA tensors (#2304)
• Fixed lost compatibility with custom datatypes implementing .to (#2335)
• Fixed loading model with kwargs (#2387)
• Fixed sum(0) for trainer.num_val_batches (#2268)
• Fixed checking if the parameters are a DictConfig Object (#2216)
• Fixed SLURM weights saving (#2341)
• Fixed swaps LR scheduler order (#2356)
• Fixed adding tensorboard hparams logging test (#2342)
• Fixed use model ref for tear down (#2360)
• Fixed logger crash on DDP (#2388)
• Fixed several issues with early stopping and checkpoint callbacks (#1504, #2391)
• Fixed loading past checkpoints from v0.7.x (#2405)
• Fixed loading model without arguments (#2403)
• Fixed Windows compatibility issue (#2358)

[0.8.1] - 2020-06-19

Fixed

• Fixed the load_from_checkpoint path detected as URL bug (#2244)
• Fixed hooks - added barrier (#2245, #2257, #2260)
• Fixed hparams - remove frame inspection on self.hparams (#2253)
• Fixed setup and on fit calls (#2252)
• Fixed GPU template (#2255)

[0.8.0] - 2020-06-18

Added

• Added overfit_batches, limit_{val|test}_batches flags (overfit now uses training set for all three) (#2213)
• Added metrics
  • Base classes (#1326, #1877)
  • Sklearn metrics classes (#1327)
  • Native torch metrics (#1488, #2062)
  • docs for all Metrics (#2184, #2209)
  • Regression metrics (#2221)
• Allow dataloaders without sampler field present (#1907)
• Added option save_last to save the model at the end of every epoch in ModelCheckpoint (#1908)
• Early stopping checks on_validation_end (#1458)
• Speed up single-core TPU training by loading data using ParallelLoader (#2033)
• Added a model hook transfer_batch_to_device that enables moving custom data structures to the target device (#1756)
• Added black formatter for the code with code-checker on pull (#1610)
• Added back the slow spawn ddp implementation as ddp_spawn (#2115)
• Added loading checkpoints from URLs (#1667)
• Added a callback method on_keyboard_interrupt for handling KeyboardInterrupt events during training (#2134)
• Added a decorator auto_move_data that moves data to the correct device when using the LightningModule for inference (#1905)
• Added ckpt_path option to LightningModule.test(...) to load particular checkpoint (#2190)
• Added setup and teardown hooks for model (#2229)

Changed

• Allow user to select individual TPU core to train on (#1729)
• Removed non-finite values from loss in LRFinder (#1862)
• Allow passing model hyperparameters as complete kwarg list (#1896)
• Renamed ModelCheckpoint's attributes best to best_model_score and kth_best_model to kth_best_model_path (#1799)
• Re-Enable Logger's ImportErrors (#1938)
• Changed the default value of the Trainer argument weights_summary from full to top (#2029)
• Raise an error when lightning replaces an existing sampler (#2020)
• Enabled prepare_data from correct processes - clarify local vs global rank (#2166)
• Remove explicit flush from tensorboard logger (#2126)
• Changed epoch indexing from 1 instead of 0 (#2206)

Deprecated

• Deprecated flags: (#2213)
  • overfit_pct in favour of overfit_batches
  • val_percent_check in favour of limit_val_batches
  • test_percent_check in favour of limit_test_batches
• Deprecated ModelCheckpoint's attributes best and kth_best_model (#1799)
• Dropped official support/testing for older PyTorch versions <1.3 (#1917)
• Deprecated Trainer proc_rank in favour of global_rank (#2166, #2269)

Removed

• Removed unintended Trainer argument progress_bar_callback, the callback should be passed in by Trainer(callbacks=[...]) instead (#1855)
• Removed obsolete self._device in Trainer (#1849)
• Removed deprecated API (#2073)
  • Packages: pytorch_lightning.pt_overrides, pytorch_lightning.root_module
  • Modules: pytorch_lightning.logging.comet_logger, pytorch_lightning.logging.mlflow_logger, pytorch_lightning.logging.test_tube_logger, pytorch_lightning.overrides.override_data_parallel, pytorch_lightning.core.model_saving, pytorch_lightning.core.root_module
  • Trainer arguments: add_row_log_interval, default_save_path, gradient_clip, nb_gpu_nodes, max_nb_epochs, min_nb_epochs, nb_sanity_val_steps
  • Trainer attributes: nb_gpu_nodes, num_gpu_nodes, gradient_clip, max_nb_epochs, min_nb_epochs, nb_sanity_val_steps, default_save_path, tng_tqdm_dic

Fixed

• Run graceful training teardown on interpreter exit (#1631)
• Fixed user warning when apex was used together with learning rate schedulers (#1873)
• Fixed multiple calls of EarlyStopping callback (#1863)
• Fixed an issue with Trainer.from_argparse_args when passing in unknown Trainer args (#1932)
• Fixed bug related to logger not being reset correctly for model after tuner algorithms (#1933)
• Fixed root node resolution for SLURM cluster with dash in host name (#1954)
• Fixed LearningRateLogger in multi-scheduler setting (#1944)
• Fixed test configuration check and testing (#1804)
• Fixed an issue with Trainer constructor silently ignoring unknown/misspelled arguments (#1820)
• Fixed save_weights_only in ModelCheckpoint (#1780)
• Allow use of same WandbLogger instance for multiple training loops (#2055)
• Fixed an issue with _auto_collect_arguments collecting local variables that are not constructor arguments and not working for signatures that have the instance not named self (#2048)
• Fixed mistake in parameters' grad norm tracking (#2012)
• Fixed CPU and hanging GPU crash (#2118)
• Fixed an issue with the model summary and example_input_array depending on a specific ordering of the submodules in a LightningModule (#1773)
• Fixed Tpu logging (#2230)
• Fixed Pid port + duplicate rank_zero logging (#2140, #2231)

[0.7.6] - 2020-05-16

Added

• Added callback for logging learning rates (#1498)
• Added transfer learning example (for a binary classification task in computer vision) (#1564)
• Added type hints in Trainer.fit() and Trainer.test() to reflect that also a list of dataloaders can be passed in (#1723).
• Added auto scaling of batch size (#1638)
• The progress bar metrics now also get updated in training_epoch_end (#1724)
• Enable NeptuneLogger to work with distributed_backend=ddp (#1753)
• Added option to provide seed to random generators to ensure reproducibility (#1572)
• Added override for hparams in load_from_ckpt (#1797)
• Added support multi-node distributed execution under torchelastic (#1811, #1818)
• Added using store_true for bool args (#1822, #1842)
• Added dummy logger for internally disabling logging for some features (#1836)

Changed

• Enable non-blocking for device transfers to GPU (#1843)
• Replace mata_tags.csv with hparams.yaml (#1271)
• Reduction when batch_size < num_gpus (#1609)
• Updated LightningTemplateModel to look more like Colab example (#1577)
• Don't convert namedtuple to tuple when transferring the batch to target device (#1589)
• Allow passing hparams as keyword argument to LightningModule when loading from checkpoint (#1639)
• Args should come after the last positional argument (#1807)
• Made ddp the default if no backend specified with multiple GPUs (#1789)

Deprecated

• Deprecated tags_csv in favor of hparams_file (#1271)

Fixed

• Fixed broken link in PR template (#1675)
• Fixed ModelCheckpoint not None checking filepath (#1654)
• Trainer now calls on_load_checkpoint() when resuming from a checkpoint (#1666)
• Fixed sampler logic for ddp with iterable dataset (#1734)
• Fixed _reset_eval_dataloader() for IterableDataset (#1560)
• Fixed Horovod distributed backend to set the root_gpu property (#1669)
• Fixed wandb logger global_step affects other loggers (#1492)
• Fixed disabling progress bar on non-zero ranks using Horovod backend (#1709)
• Fixed bugs that prevent lr finder to be used together with early stopping and validation dataloaders (#1676)
• Fixed a bug in Trainer that prepended the checkpoint path with version_ when it shouldn't (#1748)
• Fixed lr key name in case of param groups in LearningRateLogger (#1719)
• Fixed accumulation parameter and suggestion method for learning rate finder (#1801)
• Fixed num processes wasn't being set properly and auto sampler was ddp failing (#1819)
• Fixed bugs in semantic segmentation example (#1824)
• Fixed saving native AMP scaler state (#1777)
• Fixed native amp + ddp (#1788)
• Fixed hparam logging with metrics (#1647)

[0.7.5] - 2020-04-27

Changed

• Allow logging of metrics together with hparams (#1630)

Removed

• Removed Warning from trainer loop (#1634)

Fixed

• Fixed ModelCheckpoint not being fixable (#1632)
• Fixed CPU DDP breaking change and DDP change (#1635)
• Tested pickling (#1636)

[0.7.4] - 2020-04-26

Added

• Added flag replace_sampler_ddp to manually disable sampler replacement in DDP (#1513)
• Added auto_select_gpus flag to trainer that enables automatic selection of available GPUs on exclusive mode systems.
• Added learning rate finder (#1347)
• Added support for DDP mode in clusters without SLURM (#1387)
• Added test_dataloaders parameter to Trainer.test() (#1434)
• Added terminate_on_nan flag to trainer that performs a NaN check with each training iteration when set to True (#1475)
• Added speed parity tests (max 1 sec difference per epoch)(#1482)
• Added ddp_cpu backend for testing ddp without GPUs (#1158)
• Added Horovod support as a distributed backend Trainer(distributed_backend='horovod') (#1529)
• Added support for 8 core distributed training on Kaggle TPU's (#1568)
• Added support for native AMP (#1561, #1580)

Changed

• Changed the default behaviour to no longer include a NaN check with each training iteration (#1475)
• Decoupled the progress bar from trainer` it is a callback now and can be customized or even be replaced entirely (#1450).
• Changed lr schedule step interval behavior to update every backwards pass instead of every forwards pass (#1477)
• Defines shared proc. rank, remove rank from instances (e.g. loggers) (#1408)
• Updated semantic segmentation example with custom U-Net and logging (#1371)
• Disabled val and test shuffling (#1600)

Deprecated

• Deprecated training_tqdm_dict in favor of progress_bar_dict (#1450).

Removed

• Removed test_dataloaders parameter from Trainer.fit() (#1434)

Fixed

• Added the possibility to pass nested metrics dictionaries to loggers (#1582)
• Fixed memory leak from opt return (#1528)
• Fixed saving checkpoint before deleting old ones (#1453)
• Fixed loggers - flushing last logged metrics even before continue, e.g. trainer.test() results (#1459)
• Fixed optimizer configuration when configure_optimizers returns dict without lr_scheduler (#1443)
• Fixed LightningModule - mixing hparams and arguments in LightningModule.__init__() crashes load_from_checkpoint() (#1505)
• Added a missing call to the on_before_zero_grad model hook (#1493).
• Allow use of sweeps with WandbLogger (#1512)
• Fixed a bug that caused the callbacks Trainer argument to reference a global variable (#1534).
• Fixed a bug that set all boolean CLI arguments from Trainer.add_argparse_args always to True (#1571)
• Fixed do not copy the batch when training on a single GPU (#1576, #1579)
• Fixed soft checkpoint removing on DDP (#1408)
• Fixed automatic parser bug (#1585)
• Fixed bool conversion from string (#1606)

[0.7.3] - 2020-04-09

Added

• Added rank_zero_warn for warning only in rank 0 (#1428)

Fixed

• Fixed default DistributedSampler for DDP training (#1425)
• Fixed workers warning not on windows (#1430)
• Fixed returning tuple from run_training_batch (#1431)
• Fixed gradient clipping (#1438)
• Fixed pretty print (#1441)

[0.7.2] - 2020-04-07

Added

• Added same step loggers' metrics aggregation (#1278)
• Added parity test between a vanilla MNIST model and lightning model (#1284)
• Added parity test between a vanilla RNN model and lightning model (#1351)
• Added Reinforcement Learning - Deep Q-network (DQN) lightning example (#1232)
• Added support for hierarchical dict (#1152)
• Added TrainsLogger class (#1122)
• Added type hints to pytorch_lightning.core (#946)
• Added support for IterableDataset in validation and testing (#1104)
• Added support for non-primitive types in hparams for TensorboardLogger (#1130)
• Added a check that stops the training when loss or weights contain NaN or inf values. (#1097)
• Added support for IterableDataset when val_check_interval=1.0 (default), this will trigger validation at the end of each epoch. (#1283)
• Added summary method to Profilers. (#1259)
• Added informative errors if user defined dataloader has zero length (#1280)
• Added testing for python 3.8 (#915)
• Added model configuration checking (#1199)
• Added support for optimizer frequencies through LightningModule.configure_optimizers() (#1269)
• Added option to run without an optimizer by returning None from configure_optimizers. (#1279)
• Added a warning when the number of data loader workers is small. (#1378)

Changed

• Changed (renamed and refatored) TensorRunningMean -> TensorRunningAccum: running accumulations were generalized. (#1278)
• Changed progress_bar_refresh_rate trainer flag to disable progress bar when set to 0. (#1108)
• Enhanced load_from_checkpoint to also forward params to the model (#1307)
• Updated references to self.forward() to instead use the __call__ interface. (#1211)
• Changed default behaviour of configure_optimizers to use no optimizer rather than Adam. (#1279)
• Allow to upload models on W&B (#1339)
• On DP and DDP2 unsqueeze is automated now (#1319)
• Did not always create a DataLoader during reinstantiation, but the same type as before (if subclass of DataLoader) (#1346)
• Did not interfere with a default sampler (#1318)
• Remove default Adam optimizer (#1317)
• Give warnings for unimplemented required lightning methods (#1317)
• Made evaluate method private >> Trainer._evaluate(...). (#1260)
• Simplify the PL examples structure (shallower and more readable) (#1247)
• Changed min max gpu memory to be on their own plots (#1358)
• Remove .item which causes sync issues (#1254)
• Changed smoothing in TQDM to decrease variability of time remaining between training / eval (#1194)
• Change default logger to dedicated one (#1064)

Deprecated

• Deprecated Trainer argument print_nan_grads (#1097)
• Deprecated Trainer argument show_progress_bar (#1108)

Removed

• Removed test for no test dataloader in .fit (#1495)
• Removed duplicated module pytorch_lightning.utilities.arg_parse for loading CLI arguments (#1167)
• Removed wandb logger's finalize method (#1193)
• Dropped torchvision dependency in tests and added own MNIST dataset class instead (#986)

Fixed

• Fixed model_checkpoint when saving all models (#1359)
• Trainer.add_argparse_args classmethod fixed. Now it adds a type for the arguments (#1147)
• Fixed bug related to type checking of ReduceLROnPlateau lr schedulers(#1126)
• Fixed a bug to ensure lightning checkpoints to be backward compatible (#1132)
• Fixed a bug that created an extra dataloader with active reload_dataloaders_every_epoch (#1196)
• Fixed all warnings and errors in the docs build process (#1191)
• Fixed an issue where val_percent_check=0 would not disable validation (#1251)
• Fixed average of incomplete TensorRunningMean (#1309)
• Fixed WandbLogger.watch with wandb.init() (#1311)
• Fixed an issue with early stopping that would prevent it from monitoring training metrics when validation is disabled / not implemented (#1235).
• Fixed a bug that would cause trainer.test() to run on the validation set when overloading validation_epoch_end and test_end (#1353)
• Fixed WandbLogger.watch - use of the watch method without importing wandb (#1311)
• Fixed WandbLogger to be used with 'ddp' - allow reinits in sub-processes (#1149, #1360)
• Made training_epoch_end behave like validation_epoch_end (#1357)
• Fixed fast_dev_run running validation twice (#1365)
• Fixed pickle error from quick patch __code__ (#1352)
• Fixed memory leak on GPU0 (#1094, #1349)
• Fixed checkpointing interval (#1272)
• Fixed validation and training loops run the partial dataset (#1192)
• Fixed running on_validation_end only on main process in DDP (#1125)
• Fixed load_spawn_weights only in proc rank 0 (#1385)
• Fixes using deprecated use_amp attribute (#1145)
• Fixed Tensorboard logger error: lightning_logs directory not exists in multi-node DDP on nodes with rank != 0 (#1377)
• Fixed Unimplemented backend XLA error on TPU (#1387)

[0.7.1] - 2020-03-07

Fixed

• Fixes print issues and data_loader (#1080)

[0.7.0] - 2020-03-06

Added

• Added automatic sampler setup. Depending on DDP or TPU, lightning configures the sampler correctly (user needs to do nothing) (#926)
• Added reload_dataloaders_every_epoch=False flag for trainer. Some users require reloading data every epoch (#926)
• Added progress_bar_refresh_rate=50 flag for trainer. Throttle refresh rate on notebooks (#926)
• Updated governance docs
• Added a check to ensure that the metric used for early stopping exists before training commences (#542)
• Added optimizer_idx argument to backward hook (#733)
• Added entity argument to WandbLogger to be passed to wandb.init (#783)
• Added a tool for profiling training runs (#782)
• Improved flexibility for naming of TensorBoard logs, can now set version to a str to just save to that directory, and use name='' to prevent experiment-name directory (#804)
• Added option to specify step key when logging metrics (#808)
• Added train_dataloader, val_dataloader and test_dataloader arguments to Trainer.fit(), for alternative data parsing (#759)
• Added Tensor Processing Unit (TPU) support (#868)
• Added semantic segmentation example (#751,#876, #881)
• Split callbacks in multiple files (#849)
• Support for user defined callbacks (#889 and #950)
• Added support for multiple loggers to be passed to Trainer as an iterable (e.g. list, tuple, etc.) (#903)
• Added support for step-based learning rate scheduling (#941)
• Added support for logging hparams as dict (#1029)
• Checkpoint and early stopping now work without val. step (#1041)
• Support graceful training cleanup after Keyboard Interrupt (#856, #1019)
• Added type hints for function arguments (#912, )
• Added default argparser for Trainer (#952, #1023)
• Added TPU gradient clipping (#963)
• Added max/min number of steps in Trainer (#728)

Changed

• Improved NeptuneLogger by adding close_after_fit argument to allow logging after training(#908)
• Changed default TQDM to use tqdm.auto for prettier outputs in IPython notebooks (#752)
• Changed pytorch_lightning.logging to pytorch_lightning.loggers (#767)
• Moved the default tqdm_dict definition from Trainer to LightningModule, so it can be overridden by the user (#749)
• Moved functionality of LightningModule.load_from_metrics into LightningModule.load_from_checkpoint (#995)
• Changed Checkpoint path parameter from filepath to dirpath (#1016)
• Freezed models hparams as Namespace property (#1029)
• Dropped logging config in package init (#1015)
• Renames model steps (#1051)
  • training_end >> training_epoch_end
  • validation_end >> validation_epoch_end
  • test_end >> test_epoch_end
• Refactor dataloading, supports infinite dataloader (#955)
• Create single file in TensorBoardLogger (#777)

Deprecated

• Deprecated pytorch_lightning.logging (#767)
• Deprecated LightningModule.load_from_metrics in favour of LightningModule.load_from_checkpoint (#995, #1079)
• Deprecated @data_loader decorator (#926)
• Deprecated model steps training_end, validation_end and test_end (#1051, #1056)

Removed

• Removed dependency on pandas (#736)
• Removed dependency on torchvision (#797)
• Removed dependency on scikit-learn (#801)

Fixed

• Fixed a bug where early stopping on_end_epoch would be called inconsistently when check_val_every_n_epoch == 0 (#743)
• Fixed a bug where the model checkpointer didn't write to the same directory as the logger (#771)
• Fixed a bug where the TensorBoardLogger class would create an additional empty log file during fitting (#777)
• Fixed a bug where global_step was advanced incorrectly when using accumulate_grad_batches > 1 (#832)
• Fixed a bug when calling self.logger.experiment with multiple loggers (#1009)
• Fixed a bug when calling logger.append_tags on a NeptuneLogger with a single tag (#1009)
• Fixed sending back data from .spawn by saving and loading the trained model in/out of the process (#1017
• Fixed port collision on DDP (#1010)
• Fixed/tested pass overrides (#918)
• Fixed comet logger to log after train (#892)
• Remove deprecated args to learning rate step function (#890)

[0.6.0] - 2020-01-21

Added

• Added support for resuming from a specific checkpoint via resume_from_checkpoint argument (#516)
• Added support for ReduceLROnPlateau scheduler (#320)
• Added support for Apex mode O2 in conjunction with Data Parallel (#493)
• Added option (save_top_k) to save the top k models in the ModelCheckpoint class (#128)
• Added on_train_start and on_train_end hooks to ModelHooks (#598)
• Added TensorBoardLogger (#607)
• Added support for weight summary of model with multiple inputs (#543)
• Added map_location argument to load_from_metrics and load_from_checkpoint (#625)
• Added option to disable validation by setting val_percent_check=0 (#649)
• Added NeptuneLogger class (#648)
• Added WandbLogger class (#627)

Changed

• Changed the default progress bar to print to stdout instead of stderr (#531)
• Renamed step_idx to step, epoch_idx to epoch, max_num_epochs to max_epochs and min_num_epochs to min_epochs (#589)
• Renamed total_batch_nb to total_batches, nb_val_batches to num_val_batches, nb_training_batches to num_training_batches, max_nb_epochs to max_epochs, min_nb_epochs to min_epochs, nb_test_batches to num_test_batches, and nb_val_batches to num_val_batches (#567)
• Changed gradient logging to use parameter names instead of indexes (#660)
• Changed the default logger to TensorBoardLogger (#609)
• Changed the directory for tensorboard logging to be the same as model checkpointing (#706)

Deprecated

• Deprecated max_nb_epochs and min_nb_epochs (#567)
• Deprecated the on_sanity_check_start hook in ModelHooks (#598)

Removed

• Removed the save_best_only argument from ModelCheckpoint, use save_top_k=1 instead (#128)

Fixed

• Fixed a bug which ocurred when using Adagrad with cuda (#554)
• Fixed a bug where training would be on the GPU despite setting gpus=0 or gpus=[] (#561)
• Fixed an error with print_nan_gradients when some parameters do not require gradient (#579)
• Fixed a bug where the progress bar would show an incorrect number of total steps during the validation sanity check when using multiple validation data loaders (#597)
• Fixed support for PyTorch 1.1.0 (#552)
• Fixed an issue with early stopping when using a val_check_interval < 1.0 in Trainer (#492)
• Fixed bugs relating to the CometLogger object that would cause it to not work properly (#481)
• Fixed a bug that would occur when returning -1 from on_batch_start following an early exit or when the batch was None (#509)
• Fixed a potential race condition with several processes trying to create checkpoint directories (#530)
• Fixed a bug where batch 'segments' would remain on the GPU when using truncated_bptt > 1 (#532)
• Fixed a bug when using IterableDataset (#547)
• Fixed a bug where .item was called on non-tensor objects (#602)
• Fixed a bug where Trainer.train would crash on an uninitialized variable if the trainer was run after resuming from a checkpoint that was already at max_epochs (#608)
• Fixed a bug where early stopping would begin two epochs early (#617)
• Fixed a bug where num_training_batches and num_test_batches would sometimes be rounded down to zero (#649)
• Fixed a bug where an additional batch would be processed when manually setting num_training_batches (#653)
• Fixed a bug when batches did not have a .copy method (#701)
• Fixed a bug when using log_gpu_memory=True in Python 3.6 (#715)
• Fixed a bug where checkpoint writing could exit before completion, giving incomplete checkpoints (#689)
• Fixed a bug where on_train_end was not called when ealy stopping (#723)

[0.5.3] - 2019-11-06

Added

• Added option to disable default logger, checkpointer, and early stopping by passing logger=False, checkpoint_callback=False and early_stop_callback=False respectively
• Added CometLogger for use with Comet.ml
• Added val_check_interval argument to Trainer allowing validition to be performed at every given number of batches
• Added functionality to save and load hyperparameters using the standard checkpoint mechanism
• Added call to torch.cuda.empty_cache before training starts
• Added option for user to override the call t backward
• Added support for truncated backprop through time via the truncated_bptt_steps argument in Trainer
• Added option to operate on all outputs from training_step in DDP2
• Added a hook for modifying DDP init
• Added a hook for modifying Apex

Changed

• Changed experiment version to be padded with zeros (e.g. /dir/version_9 becomes /dir/version_0009)
• Changed callback metrics to include any metrics given in logs or progress bar
• Changed the default for save_best_only in ModelCheckpoint to True
• Added tng_data_loader for backwards compatibility
• Renamed MLFlowLogger.client to MLFlowLogger.experiment for consistency
• Moved global_step increment to happen after the batch has been processed
• Changed weights restore to first attempt HPC weights before restoring normally, preventing both weights being restored and running out of memory
• Changed progress bar functionality to add multiple progress bars for train/val/test
• Changed calls to print to use logging instead

Deprecated

• Deprecated tng_dataloader

Fixed

• Fixed an issue where the number of batches was off by one during training
• Fixed a bug that occured when setting a ckeckpoint callback and early_stop_callback=False
• Fixed an error when importing CometLogger
• Fixed a bug where the gpus argument had some unexpected behaviour
• Fixed a bug where the computed total number of batches was sometimes incorrect
• Fixed a bug where the progress bar would sometimes not show the total number of batches in test mode
• Fixed a bug when using the log_gpu_memory='min_max' option in Trainer
• Fixed a bug where checkpointing would sometimes erase the current directory

[0.5.2] - 2019-10-10

Added

• Added weights_summary argument to Trainer to be set to full (full summary), top (just top level modules) or other
• Added tags argument to MLFlowLogger

Changed

• Changed default for amp_level to O1

Removed

• Removed the print_weights_summary argument from Trainer

Fixed

• Fixed a bug where logs were not written properly
• Fixed a bug where logger.finalize wasn't called after training is complete
• Fixed callback metric errors in DDP
• Fixed a bug where TestTubeLogger didn't log to the correct directory

[0.5.1] - 2019-10-05

Added

• Added the LightningLoggerBase class for experiment loggers
• Added MLFlowLogger for logging with mlflow
• Added TestTubeLogger for logging with test_tube
• Added a different implementation of DDP (distributed_backed='ddp2') where every node has one model using all GPUs
• Added support for optimisers which require a closure (e.g. LBFGS)
• Added automatic MASTER_PORT defualt for DDP when not set manually
• Added new GPU memory logging options 'min_max' (log only the min/max utilization) and 'all' (log all the GPU memory)

Changed

• Changed schedulers to always be called with the current epoch
• Changed test_tube to an optional dependency
• Changed data loaders to internally use a getter instead of a python property
• Disabled auto GPU loading when restoring weights to prevent out of memory errors
• Changed logging, early stopping and checkpointing to occur by default

Fixed

• Fixed a bug with samplers that do not specify set_epoch
• Fixed a bug when using the MLFlowLogger with unsupported data types, this will now raise a warning
• Fixed a bug where gradient norms were alwasy zero using track_grad_norm
• Fixed a bug which causes a crash when logging memory

[0.5.0] - 2019-09-26

Changed

• Changed data_batch argument to batch throughout
• Changed batch_i argument to batch_idx throughout
• Changed tng_dataloader method to train_dataloader
• Changed on_tng_metrics method to on_training_metrics
• Changed gradient_clip argument to gradient_clip_val
• Changed add_log_row_interval to row_log_interval

Fixed

• Fixed a bug with tensorboard logging in multi-gpu setup

[0.4.9] - 2019-09-16

Added

• Added the flag log_gpu_memory to Trainer to deactivate logging of GPU memory utilization
• Added SLURM resubmit functionality (port from test-tube)
• Added optional weight_save_path to trainer to remove the need for a checkpoint_callback when using cluster training
• Added option to use single gpu per node with DistributedDataParallel

Changed

• Changed functionality of validation_end and test_end with multiple dataloaders to be given all of the dataloaders at once rather than in seperate calls
• Changed print_nan_grads to only print the parameter value and gradients when they contain NaN
• Changed gpu API to take integers as well (e.g. gpus=2 instead of gpus=[0, 1])
• All models now loaded on to CPU to avoid device and out of memory issues in PyTorch

Fixed

• Fixed a bug where data types that implement .to but not .cuda would not be properly moved onto the GPU
• Fixed a bug where data would not be re-shuffled every epoch when using a DistributedSampler

[0.4.8] - 2019-08-31

Added

• Added test_step and test_end methods, used when Trainer.test is called
• Added GradientAccumulationScheduler callback which can be used to schedule changes to the number of accumulation batches
• Added option to skip the validation sanity check by setting nb_sanity_val_steps = 0

Fixed

• Fixed a bug when setting nb_sanity_val_steps = 0

[0.4.7] - 2019-08-24

Changed

• Changed the default val_check_interval to 1.0
• Changed defaults for nb_val_batches, nb_tng_batches and nb_test_batches to 0

Fixed

• Fixed a bug where the full validation set as used despite setting val_percent_check
• Fixed a bug where an Exception was thrown when using a data set containing a single batch
• Fixed a bug where an Exception was thrown if no val_dataloader was given
• Fixed a bug where tuples were not properly transfered to the GPU
• Fixed a bug where data of a non standard type was not properly handled by the trainer
• Fixed a bug when loading data as a tuple
• Fixed a bug where AttributeError could be suppressed by the Trainer

[0.4.6] - 2019-08-15

Added

• Added support for data to be given as a dict or list with a single gpu
• Added support for configure_optimizers to return a single optimizer, two list (optimizers and schedulers), or a single list

Fixed

• Fixed a bug where returning just an optimizer list (i.e. without schedulers) from configure_optimizers would throw an Exception

[0.4.5] - 2019-08-13

Added

• Added optimizer_step method that can be overridden to change the standard optimizer behaviour

[0.4.4] - 2019-08-12

Added

• Added supoort for multiple validation dataloaders
• Added support for latest test-tube logger (optimised for torch==1.2.0)

Changed

• validation_step and val_dataloader are now optional
• lr_scheduler is now activated after epoch

Fixed

• Fixed a bug where a warning would show when using lr_scheduler in torch>1.1.0
• Fixed a bug where an Exception would be thrown if using torch.DistributedDataParallel without using a DistributedSampler, this now throws a Warning instead

[0.4.3] - 2019-08-10

Fixed

• Fixed a bug where accumulate gradients would scale the loss incorrectly

[0.4.2] - 2019-08-08

Changed

• Changed install requirement to torch==1.2.0

[0.4.1] - 2019-08-08

Changed

• Changed install requirement to torch==1.1.0

[0.4.0] - 2019-08-08

Added

• Added 16-bit support for a single GPU
• Added support for training continuation (preserves epoch, global step etc.)

Changed

• Changed training_step and validation_step, outputs will no longer be automatically reduced

Removed

• Removed need for Experiment object in Trainer

Fixed

• Fixed issues with reducing outputs from generative models (such as images and text)

[0.3.6] - 2019-07-25

Added

• Added a decorator to do lazy data loading internally

Fixed

• Fixed a bug where Experiment object was not process safe, potentially causing logs to be overwritten

[0.3.5] - 2019-07-25

[0.3.4] - 2019-07-22

[0.3.3] - 2019-07-22

[0.3.2] - 2019-07-21

[0.3.1] - 2019-07-21

[0.2.x] - 2019-07-09

[0.1.x] - 2019-06-DD