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fix checkpoint #66

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fix checkpoint #66

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6 changes: 4 additions & 2 deletions models/nn.py
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Original file line number Diff line number Diff line change
Expand Up @@ -127,10 +127,12 @@ def timestep_embedding(timesteps, dim, max_period=10000):
return embedding


def torch_checkpoint(func, args, flag, preserve_rng_state=False):
def torch_checkpoint(func, args, flag, preserve_rng_state=True):
# torch's gradient checkpoint works with automatic mixed precision, given torch >= 1.8
if flag:
return torch.utils.checkpoint.checkpoint(
func, *args, preserve_rng_state=preserve_rng_state)
func, *args,
use_reentrant=True,
preserve_rng_state=preserve_rng_state)
else:
return func(*args)