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Add torch._check hints for torch.export #5467

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Add torch._check hints for torch.export #5467

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7 changes: 6 additions & 1 deletion detectron2/structures/image_list.py
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Original file line number Diff line number Diff line change
Expand Up @@ -111,7 +111,12 @@ def from_tensors(
# This seems slightly (2%) faster.
# TODO: check whether it's faster for multiple images as well
image_size = image_sizes[0]
padding_size = [0, max_size[-1] - image_size[1], 0, max_size[-2] - image_size[0]]
u0 = (max_size[-1] - image_size[1]).item()
u1 = (max_size[-2] - image_size[0]).item()
padding_size = [0, u0, 0, u1]
if torch.compiler.is_compiling():
torch._check(u0 >= 0)
torch._check(u1 >= 0)
batched_imgs = F.pad(tensors[0], padding_size, value=pad_value).unsqueeze_(0)
else:
# max_size can be a tensor in tracing mode, therefore convert to list
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