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Fix grad getting enabled for parameters on which explicitly disabled in case of multiple optimizers #5356

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Fix grad getting enabled for parameters on which explicitly disabled in case of multiple optimizers #5356

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:bug: Fix grad getting enabled for parameters on which explicitly dis…
jain-anshul Jan 5, 2021
b046f18
Merge branch 'master' into multi_opt
jain-anshul Jan 5, 2021
c1d6827
Merge branch 'master' into multi_opt
tchaton Jan 19, 2021
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5 changes: 4 additions & 1 deletion pytorch_lightning/core/lightning.py
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Original file line number Diff line number Diff line change
Expand Up @@ -112,6 +112,7 @@ def __init__(self, *args, **kwargs):
self._current_hook_fx_name = None
self._current_dataloader_idx = None
self._automatic_optimization: bool = True
self.param_grad_dict = {}
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Should be private.


def optimizers(self, use_pl_optimizer: bool = True) -> Union[Optimizer, List[Optimizer], List[LightningOptimizer]]:
if use_pl_optimizer:
Expand Down Expand Up @@ -1171,11 +1172,13 @@ def toggle_optimizer(self, optimizer: Optimizer, optimizer_idx: int):
optimizer_idx:
"""
for param in self.parameters():
if param not in self.param_grad_dict:
self.param_grad_dict[param] = param.requires_grad
param.requires_grad = False

for group in optimizer.param_groups:
for param in group['params']:
param.requires_grad = True
param.requires_grad = self.param_grad_dict[param]

def optimizer_step(
self,
Expand Down