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[torch.compile] fix sym_tensor_indices #12191

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Merged
merged 2 commits into from
Jan 20, 2025
Merged

[torch.compile] fix sym_tensor_indices #12191

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ddddf33
fix sym_tensor_indices
youkaichao Jan 19, 2025
d5c42f2
use torch check
youkaichao Jan 20, 2025
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6 changes: 5 additions & 1 deletion vllm/compilation/backends.py
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Original file line number Diff line number Diff line change
Expand Up @@ -624,9 +624,13 @@ def __call__(self, graph: fx.GraphModule, example_inputs) -> Callable:
]

# index of tensors that have symbolic shapes (batch size)
# for weights and static buffers, they will have concrete shapes.
# symbolic shape only happens for input tensors.
from torch.fx.experimental.symbolic_shapes import is_symbolic
self.sym_tensor_indices = [
i for i, x in enumerate(fake_args)
if isinstance(x, torch._subclasses.fake_tensor.FakeTensor)
if isinstance(x, torch._subclasses.fake_tensor.FakeTensor) and \
any(is_symbolic(d) for d in x.size())
]

# compiler managed cudagraph input buffers
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