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< div align = "center" >
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< img src = "docs/source/_images/logos/lightning_logo-name.png" width = "400px" >
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**The lightweight PyTorch wrapper for high-performance AI research.
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Scale your models, not the boilerplate.**
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---
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< p align = "center" >
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< a href = "https://www.pytorchlightning.ai/" > Website< / a > •
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< a href = "#key-features" > Key Features< / a > •
< a href = "#how-to-use" > How To Use< / a > •
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< a href = "https://pytorch-lightning.readthedocs.io/en/stable/" > Docs< / a > •
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< a href = "#examples" > Examples< / a > •
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< a href = "#community" > Community< / a > •
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< a href = "#grid-ai" > Grid AI< / a > •
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< a href = "#licence" > Licence< / a >
< / p >
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<!-- DO NOT ADD CONDA DOWNLOADS... README CHANGES MUST BE APPROVED BY EDEN OR WILL -->
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[](https://pypi.org/project/pytorch-lightning/)
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[](https://badge.fury.io/py/pytorch-lightning)
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[](https://pepy.tech/project/pytorch-lightning)
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[](https://anaconda.org/conda-forge/pytorch-lightning)
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[](https://hub.docker.com/r/pytorchlightning/pytorch_lightning)
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[](https://codecov.io/gh/PyTorchLightning/pytorch-lightning)
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[](https://pytorch-lightning.readthedocs.io/en/stable/)
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[](https://join.slack.com/t/pytorch-lightning/shared_invite/zt-f6bl2l0l-JYMK3tbAgAmGRrlNr00f1A)
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[](https://forums.pytorchlightning.ai/)
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[](https://github.com/PytorchLightning/pytorch-lightning/blob/master/LICENSE)
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[](https://shields.io/)
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###### *Codecov is > 90%+ but build delays may show less
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---
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## PyTorch Lightning is just organized PyTorch
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Lightning disentangles PyTorch code to decouple the science from the engineering.
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---
## Lightning Philosophy
Lightning is designed with these principles in mind:
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Principle 1: Enable maximal flexibility.
Principle 2: Abstract away unecessary boilerplate, but make it accessible when needed.
Principle 3: Systems should be self-contained (ie: optimizers, computation code, etc).
Principle 4: Deep learning code should be organized into 4 distinct categories.
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- Research code (the LightningModule).
- Engineering code (you delete, and is handled by the Trainer).
- Non-essential research code (logging, etc... this goes in Callbacks).
- Data (use PyTorch Dataloaders or organize them into a LightningDataModule).
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Once you do this, you can train on multiple-GPUs, TPUs, CPUs and even in 16-bit precision without changing your code!
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Get started with our [2 step guide ](https://pytorch-lightning.readthedocs.io/en/stable/new-project.html )
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---
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## Inference
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Lightning is also designed for the fast inference AI researchers and production teams need to scale up things like BERT and self-supervised learning.
Lightning can automatically export to ONNX or TorchScript for those cases.
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---
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## Trending contributors
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[](https://sourcerer.io/fame/williamFalcon/pytorchlightning/pytorch-lightning/links/0)
[](https://sourcerer.io/fame/williamFalcon/pytorchlightning/pytorch-lightning/links/1)
[](https://sourcerer.io/fame/williamFalcon/pytorchlightning/pytorch-lightning/links/2)
[](https://sourcerer.io/fame/williamFalcon/pytorchlightning/pytorch-lightning/links/3)
[](https://sourcerer.io/fame/williamFalcon/pytorchlightning/pytorch-lightning/links/4)
[](https://sourcerer.io/fame/williamFalcon/pytorchlightning/pytorch-lightning/links/5)
[](https://sourcerer.io/fame/williamFalcon/pytorchlightning/pytorch-lightning/links/6)
[](https://sourcerer.io/fame/williamFalcon/pytorchlightning/pytorch-lightning/links/7)
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---
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## Continuous Integration
< center >
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| System / PyTorch ver. | 1.3 (min. req.)* | 1.4 | 1.5 | 1.6 | 1.7 (latest) | 1.8 (nightly) |
| :---: | :---: | :---: | :---: | :---: | :---: | :---: |
| Conda py3.7 [linux] | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22PyTorch+%26+Conda%22+branch%3Amaster) | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22PyTorch+%26+Conda%22+branch%3Amaster) | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22PyTorch+%26+Conda%22+branch%3Amaster) | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22PyTorch+%26+Conda%22+branch%3Amaster) | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22PyTorch+%26+Conda%22+branch%3Amaster) | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22PyTorch+%26+Conda%22+branch%3Amaster) |
| Linux py3.7 [GPUs**] | - | - | - | [](http://104.154.220.231/PyTorchLightning/pytorch-lightning) | - | - |
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| Linux py3.7 [TPUs***] | - | - | - | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22TPU+tests%22+branch%3Amaster) | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22TPU+tests%22+branch%3Amaster) | - |
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| Linux py3.6 / py3.7 / py3.8 | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22CI+testing%22) | - | - | - | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22CI+testing%22) | - |
| OSX py3.6 / py3.7 | - | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22CI+testing%22) | - | - | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22CI+testing%22) | - |
| Windows py3.6 / py3.7 / py3.8 | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22CI+testing%22) | - | - | - | [](https://github.com/PyTorchLightning/pytorch-lightning/actions?query=workflow%3A%22CI+testing%22) | - |
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- _\* `torch>=1.4` is the minimal pytorch version for Python 3.8_
- _\** tests run on two NVIDIA K80_
- _\*** tests run on Google GKE TPUv2/3_
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- _TPU w/ py3.6/py3.7 means we support Colab and Kaggle env._
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< / center >
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---
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## How To Use
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#### Step 0: Install
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Simple installation from PyPI
```bash
pip install pytorch-lightning
```
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_To get full package experience you can install also all optional dependencies with `pytorch-lightning['extra']` or for CPU users with `pytorch-lightning['cpu-extra']` ._
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From Conda
```bash
conda install pytorch-lightning -c conda-forge
```
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Install bleeding-edge (no guarantees)
```bash
pip install git+https://github.com/PytorchLightning/pytorch-lightning.git@master --upgrade
```
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#### Step 0: Add these imports
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```python
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import os
import torch
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from torch import nn
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import torch.nn.functional as F
from torchvision.datasets import MNIST
from torch.utils.data import DataLoader, random_split
from torchvision import transforms
import pytorch_lightning as pl
```
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#### Step 1: Define a LightningModule (nn.Module subclass)
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A LightningModule defines a full *system* (ie: a GAN, autoencoder, BERT or a simple Image Classifier).
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```python
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class LitAutoEncoder(pl.LightningModule):
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def __init__ (self):
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super().__init__()
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self.encoder = nn.Sequential(nn.Linear(28 * 28, 128), nn.ReLU(), nn.Linear(128, 3))
self.decoder = nn.Sequential(nn.Linear(3, 128), nn.ReLU(), nn.Linear(128, 28 * 28))
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def forward(self, x):
# in lightning, forward defines the prediction/inference actions
embedding = self.encoder(x)
return embedding
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def training_step(self, batch, batch_idx):
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# training_step defined the train loop. It is independent of forward
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x, y = batch
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x = x.view(x.size(0), -1)
z = self.encoder(x)
x_hat = self.decoder(z)
loss = F.mse_loss(x_hat, x)
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self.log('train_loss', loss)
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return loss
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def configure_optimizers(self):
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optimizer = torch.optim.Adam(self.parameters(), lr=1e-3)
return optimizer
```
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###### Note: Training_step defines the training loop. Forward defines how the LightningModule behaves during inference/prediction.
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#### Step 2: Train!
```python
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dataset = MNIST(os.getcwd(), download=True, transform=transforms.ToTensor())
train, val = random_split(dataset, [55000, 5000])
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autoencoder = LitAutoEncoder()
trainer = pl.Trainer()
trainer.fit(autoencoder, DataLoader(train), DataLoader(val))
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```
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#### And without changing a single line of code, you could run on GPUs/TPUs
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```python
# 8 GPUs
trainer = Trainer(max_epochs=1, gpus=8)
# 256 GPUs
trainer = Trainer(max_epochs=1, gpus=8, num_nodes=32)
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# TPUs
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trainer = Trainer(tpu_cores=8)
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```
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#### And even export for production via onnx or torchscript
```python
# torchscript
autoencoder = LitAutoEncoder()
torch.jit.save(autoencoder.to_torchscript(), "model.pt")
# onnx
with tempfile.NamedTemporaryFile(suffix='.onnx', delete=False) as tmpfile:
autoencoder = LitAutoEncoder()
input_sample = torch.randn((1, 64))
autoencoder.to_onnx(tmpfile.name, input_sample, export_params=True)
os.path.isfile(tmpfile.name)
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```
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#### For advanced users, you can still own complex training loops
```python
class LitAutoEncoder(pl.LightningModule):
def training_step(self, batch, batch_idx, opt_idx):
(opt_a, opt_b) = self.optimizers()
loss_a = ...
self.manual_backward(loss_a, opt_a)
opt_a.step()
opt_a.zero_grad()
loss_b = ...
self.manual_backward(loss_b, opt_b, retain_graph=True)
self.manual_backward(loss_b, opt_b)
opt_b.step()
opt_b.zero_grad()
```
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---
## Key Features
* Scale your models to run on any hardware (CPU, GPUs, TPUs) without changing your model
* Making code more readable by decoupling the research code from the engineering
* Easier to reproduce
* Less error prone by automating most of the training loop and tricky engineering
* Keeps all the flexibility (LightningModules are still PyTorch modules), but removes a ton of boilerplate
* Lightning has out-of-the-box integration with the popular logging/visualizing frameworks ([Tensorboard](https://pytorch.org/docs/stable/tensorboard.html), [MLFlow ](https://mlflow.org/ ), [Neptune.ai ](https://neptune.ai/ ), [Comet.ml ](https://www.comet.ml/site/ ), [Wandb ](https://www.wandb.com/ )).
* [Tested rigorously with every new PR ](https://github.com/PyTorchLightning/pytorch-lightning/tree/master/tests ). We test every combination of PyTorch and Python supported versions, every OS, multi GPUs and even TPUs.
* Minimal running speed overhead (about 300 ms per epoch compared with pure PyTorch).
### Lightning automates 40+ parts of DL/ML research
- GPU training
- Distributed GPU (cluster) training
- TPU training
- EarlyStopping
- Logging/Visualizing
- Checkpointing
- Experiment management
- [Full list here ](https://pytorch-lightning.readthedocs.io/en/latest/#common-use-cases )
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---
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## Examples
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###### Hello world
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[MNIST hello world ](https://colab.research.google.com/github/PytorchLightning/pytorch-lightning/blob/master/notebooks/01-mnist-hello-world.ipynb )
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[MNIST on TPUs ](https://colab.research.google.com/drive/1-_LKx4HwAxl5M6xPJmqAAu444LTDQoa3 )
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###### Contrastive Learning
[BYOL ](https://pytorch-lightning-bolts.readthedocs.io/en/latest/self_supervised_models.html#byol )
[CPC v2 ](https://pytorch-lightning-bolts.readthedocs.io/en/latest/self_supervised_models.html#cpc-v2 )
[Moco v2 ](https://pytorch-lightning-bolts.readthedocs.io/en/latest/self_supervised_models.html#moco-v2 )
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[SIMCLR ](https://pytorch-lightning-bolts.readthedocs.io/en/latest/self_supervised_models.html#simclr )
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###### NLP
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[BERT ](https://colab.research.google.com/github/PytorchLightning/pytorch-lightning/blob/master/notebooks/04-transformers-text-classification.ipynb )
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[GPT-2 ](https://pytorch-lightning-bolts.readthedocs.io/en/latest/convolutional.html#gpt-2 )
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###### Reinforcement Learning
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[DQN ](https://pytorch-lightning-bolts.readthedocs.io/en/latest/reinforce_learn.html?highlight=dqn#dqn-models )
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[Dueling-DQN ](https://pytorch-lightning-bolts.readthedocs.io/en/latest/reinforce_learn.html#dueling-dqn )
[Reinforce ](https://pytorch-lightning-bolts.readthedocs.io/en/latest/reinforce_learn.html#reinforce )
###### Vision
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[GAN ](https://colab.research.google.com/github/PytorchLightning/pytorch-lightning/blob/master/notebooks/03-basic-gan.ipynb )
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###### Classic ML
[Logistic Regression ](https://pytorch-lightning-bolts.readthedocs.io/en/latest/classic_ml.html#logistic-regression )
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[Linear Regression ](https://pytorch-lightning-bolts.readthedocs.io/en/latest/classic_ml.html#linear-regression )
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---
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## Community
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The lightning community is maintained by
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- [16 core contributors ](https://pytorch-lightning.readthedocs.io/en/latest/governance.html ) who are all a mix of professional engineers, Research Scientists, Ph.D. students from top AI labs.
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- 280+ community contributors.
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Lightning is also part of the [PyTorch ecosystem ](https://pytorch.org/ecosystem/ ) which requires projects to have solid testing, documentation and support.
### Asking for help
If you have any questions please:
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1. [Read the docs ](https://pytorch-lightning.rtfd.io/en/latest/ ).
2. [Look it up in our forum (or add a new question) ](https://forums.pytorchlightning.ai/ )
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2. [Search through the issues ](https://github.com/PytorchLightning/pytorch-lightning/issues?utf8=%E2%9C%93&q=my++question ).
3. [Join our slack ](https://join.slack.com/t/pytorch-lightning/shared_invite/zt-f6bl2l0l-JYMK3tbAgAmGRrlNr00f1A ).
4. [Ask on stackoverflow ](https://stackoverflow.com/questions/ask?guided=false ) with the tag pytorch-lightning.
### Funding
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Building open-source software with only a few part-time people is hard!
[We're venture funded ](https://techcrunch.com/2020/10/08/grid-ai-raises-18-6m-series-a-to-help-ai-researchers-and-engineers-bring-their-models-to-production/ )
and backed by some of the top VC funds in the world, [Index Ventures ](https://www.indexventures.com/companies/ ), [Bain Capital Ventures ](https://www.baincapitalventures.com/portfolio/ ), [First Minute Capital ](https://firstminute.capital/companies ).
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Their funding ensures we can continue to build awesome tooling like Grid, give you around the clock support,
hire a full-time staff, attend conferences, and move faster through implementing features you request.
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To supercharge your research and production work, visit our [Grid.ai platform ](https://www.grid.ai/ )
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---
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## Grid AI
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Grid AI is our native platform for training models at scale on the cloud!
**Sign up for [early access here ](https://www.grid.ai/ )**
To use grid, take your regular command:
```
python my_model.py --learning_rate 1e-6 --layers 2 --gpus 4
```
And change it to use the grid train command:
```
grid train --grid_gpus 4 my_model.py --learning_rate 'uniform(1e-6, 1e-1, 20)' --layers '[2, 4, 8, 16]'
```
The above command will launch (20 * 4) experiments each running on 4 GPUs (320 GPUs!) - by making ZERO changes to
your code.
---
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## Licence
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Please observe the Apache 2.0 license that is listed in this repository. In addition
the Lightning framework is Patent Pending.
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## BibTeX
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If you want to cite the framework feel free to use this (but only if you loved it 😊):
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```bibtex
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@article {falcon2019pytorch,
title={PyTorch Lightning},
author={Falcon, WA},
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journal={GitHub. Note: https://github.com/PyTorchLightning/pytorch-lightning},
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volume={3},
year={2019}
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}
```
