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22 lines
758 B
Python
22 lines
758 B
Python
# SPDX-License-Identifier: Apache-2.0
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# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
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from torch import fx
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from vllm.compilation.vllm_inductor_pass import VllmInductorPass
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class PostCleanupPass(VllmInductorPass):
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"""
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This pass performs cleanup after custom passes.
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It topologically sorts the graph and removes unused nodes.
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This is needed because the pattern matcher does not guarantee producing
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a topologically sorted graph, and there may be unused nodes left around.
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"""
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@VllmInductorPass.time_and_log
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def __call__(self, graph: fx.Graph) -> None:
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from torch._inductor.pattern_matcher import stable_topological_sort
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stable_topological_sort(graph)
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graph.eliminate_dead_code()
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