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[fuse_elementwise] Fix external outputs collection #848

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@ymwangg ymwangg commented Jul 26, 2023

This PR fixed a corner case where the fuse_elementwise pass may produce two external output tensors with different shapes. This subgraph pattern is seen the huggingface bert model.

…has multiple external outputs with different shapes
@facebook-github-bot facebook-github-bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Jul 26, 2023
"""
Given an elementwise op, returns a list of parent elementwise ops
which can be fused with this elementwise op.
"""

# Get parent ops.
dependent_ops = set()
for input_tensor in op._attrs["inputs"]:
for input_tensor in src_op._attrs["inputs"]:
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This is to avoid a naming collision to make debug easier.

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