lightning/docs/LightningModule/methods.md

Lightning modules are strict superclasses of torch.nn.Module. A LightningModule offers the following in addition to that API.

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freeze

Freeze all params for inference

model = MyLightningModule(...)
model.freeze()

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load_from_metrics

This is the easiest/fastest way which uses the meta_tags.csv file from test-tube to rebuild the model. The meta_tags.csv file can be found in the test-tube experiment save_dir.

pretrained_model = MyLightningModule.load_from_metrics(
    weights_path='/path/to/pytorch_checkpoint.ckpt',
    tags_csv='/path/to/test_tube/experiment/version/meta_tags.csv',
    on_gpu=True,
    map_location=None
)
    
# predict 
pretrained_model.freeze()
y_hat = pretrained_model(x)

Params

Param	description
weights_path	Path to a pytorch checkpoint
tags_csv	Path to meta_tags.csv file generated by the test-tube Experiment
on_gpu	if True, puts model on GPU. Make sure to use transforms option if model devices have changed
map_location	A dictionary mapping saved weight GPU devices to new GPU devices

Returns

LightningModule - The pretrained LightningModule

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unfreeze

Unfreeze all params for inference

model = MyLightningModule(...)
model.unfreeze()