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[torchlib] Fix unbind.int if num_outputs=1 #2684

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justinchuby merged 2 commits into from
Nov 6, 2025
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[torchlib] Fix unbind.int if num_outputs=1 #2684

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fix(outputs): Cast to sequence if num_outputs=1
sebimarkgraf Nov 5, 2025
58a1672
Update onnxscript/function_libs/torch_lib/ops/core.py
justinchuby Nov 5, 2025
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6 changes: 5 additions & 1 deletion onnxscript/function_libs/torch_lib/ops/core.py
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Expand Up @@ -8957,7 +8957,11 @@ def aten_unbind(self: TTensor, dim: int = 0) -> Sequence[TTensor]:
if isinstance(self.shape[dim], int) and not version_utils.torch_older_than("2.7"):
# We can create a definitive split op if the input shape is static
# Only torch>=2.7 supports correctly generating the correct number of outputs for Split
outputs = op.Split(self, axis=dim, num_outputs=self.shape[dim])
num_outputs = self.shape[dim]
outputs = op.Split(self, axis=dim, num_outputs=num_outputs)
if num_outputs == 1:
outputs = [outputs]
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return [op.Squeeze(out, [dim]) for out in outputs]

return op.SplitToSequence(self, axis=dim, keepdims=False)
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