8000 fix: remove reference_model_buffers in fsdp2 by yuki-666 · Pull Request #558 · NVIDIA-NeMo/RL · GitHub
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fix: remove reference_model_buffers in fsdp2 #558

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merged 1 commit into from
Jun 26, 2025
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fix: remove reference_model_buffers in fsdp2 #558

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19 changes: 5 additions & 14 deletions nemo_rl/models/policy/dtensor_policy_worker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -235,9 +235,6 @@ def __init__(
self.reference_model_state_dict = get_cpu_state_dict(
self.model.state_dict().items(), pin_memory=True
)
self.reference_model_buffers = get_cpu_state_dict(
self.model.named_buffers(), pin_memory=True
)

if init_optimizer:
optimizer_cls = import_class_from_path(self.cfg["optimizer"]["name"])
Expand Down Expand Up @@ -768,32 +765,26 @@ def use_reference_model(self) -> Generator[None, None, None]:
"""
with torch.no_grad():
try:
# Save train model state_dict
curr_state_dict = get_cpu_state_dict(
self.model.state_dict().items(), pin_memory=True
)
curr_buffers = get_cpu_state_dict(
self.model.named_buffers(), pin_memory=True
)

# Swap reference model state_dict to self.model
for k, v in self.model.state_dict().items():
val = to_local_if_dtensor(v)
val.copy_(self.reference_model_state_dict[k])

for k, v in self.model.named_buffers():
val = to_local_if_dtensor(v)
val.copy_(self.reference_model_buffers[k])

# - self.model is the original reference_model, now on CUDA
# - curr_state_dict is the train model, now on CPU
yield

finally:
# Restore train model state_dict
for k, v in self.model.state_dict().items():
val = to_local_if_dtensor(v)
val.copy_(curr_state_dict[k])

for k, v in self.model.named_buffers():
val = to_local_if_dtensor(v)
val.copy_(curr_buffers[k])

def get_reference_policy_logprobs(
self, data: BatchedDataDict[Any], micro_batch_size: Optional[int] = None
) -> BatchedDataDict[ReferenceLogprobOutputSpec]:
Expand Down
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