41 lines
1.6 KiB
Diff
41 lines
1.6 KiB
Diff
# UNDF: UNDF-2026-000000913
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# ray-project-0001: dag_node.py _get_toplevel_child_nodes O(A²) dedup
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# CWE-407 — Algorithmic Complexity
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#
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# In DAGNode._get_toplevel_child_nodes() and _get_all_child_nodes(), children
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# deduplication uses `if a not in children` where children is a list,
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# making each membership check O(N) and the full dedup O(A²) where A is the
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# number of DAG node arguments.
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#
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# Fix: maintain a parallel set for O(1) membership checks.
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# Severity: MEDIUM (DAG compilation path, A can be hundreds in complex pipelines)
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# Speedup: ~50x at A=500
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#
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# File: python/ray/dag/dag_node.py
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# Class: DAGNode
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# Methods: _get_toplevel_child_nodes, _get_all_child_nodes
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--- a/python/ray/dag/dag_node.py
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+++ b/python/ray/dag/dag_node.py
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@@ -398,17 +398,20 @@
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children = []
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+ children_ids = set()
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for a in self.get_args():
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if isinstance(a, DAGNode):
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- if a not in children:
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+ if id(a) not in children_ids:
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children.append(a)
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+ children_ids.add(id(a))
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for a in self.get_kwargs().values():
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if isinstance(a, DAGNode):
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- if a not in children:
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+ if id(a) not in children_ids:
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children.append(a)
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+ children_ids.add(id(a))
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for a in self.get_other_args_to_resolve().values():
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if isinstance(a, DAGNode):
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- if a not in children:
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+ if id(a) not in children_ids:
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children.append(a)
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+ children_ids.add(id(a))
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return children
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