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[BugFix] correct dim for resolving dtype in _split_and_pad_sequence #2801

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Feb 21, 2025
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4 changes: 3 additions & 1 deletion torchrl/objectives/value/utils.py
Original file line number Diff line number Diff line change
Expand Up @@ -286,7 +286,9 @@ def _split_and_pad_sequence(

# int16 supports length up to 32767
dtype = (
torch.int16 if tensor.shape[-2] < torch.iinfo(torch.int16).max else torch.int32
torch.int16
if tensor.size(time_dim) < torch.iinfo(torch.int16).max
else torch.int32
)
arange = torch.arange(max_seq_len, device=tensor.device, dtype=dtype).unsqueeze(0)
mask = arange < splits.unsqueeze(1)
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