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Fixed an issue with unsafe dimension expansion when handling 1D timestep tensors #218

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Fixed an issue with unsafe dimension expansion when handling 1D timestep tensors #218

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3 changes: 3 additions & 0 deletions wan/modules/model.py
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Original file line number Diff line number Diff line change
Expand Up @@ -458,6 +458,9 @@ def forward(

# time embeddings
if t.dim() == 1:
# Note: expand only works for dimensions of size 1; view(-1, 1) must be called first.
t = t.view(-1, 1).expand(t.size(0), seq_len)
elif t.dim() == 2 and t.size(1) == 1:
t = t.expand(t.size(0), seq_len)
with torch.amp.autocast('cuda', dtype=torch.float32):
bt = t.size(0)
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