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[RLlib]: Fix torch None conversion #26863

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Jul 23, 2022
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[RLlib]: Fix torch None conversion #26863

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3 changes: 3 additions & 0 deletions rllib/utils/torch_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -146,6 +146,9 @@ def convert_to_torch_tensor(x: TensorStructType, device: Optional[str] = None):
"""

def mapping(item):
if item is None:
# returns None with dtype=np.obj
return np.asarray(item)
# Already torch tensor -> make sure it's on right device.
if torch.is_tensor(item):
return item if device is None else item.to(device)
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