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simplex-chat-0004: introduceToRemaining notElem O(N×M) member dedup; fix: Set.notMember O(log N)

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russell@unturf.com 2026-03-29 22:03:20 -04:00
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# sklearn — CWE-407 scan result: CLEAN
Scanned: 2026-03-30
## Scope
- `sklearn/utils/graph.py` — `single_source_shortest_path_length`: uses `seen = {}` (dict), O(1) membership. CLEAN.
- `sklearn/pipeline.py` — `transformer_names = set(...)`, O(1) membership. CLEAN.
- `sklearn/feature_extraction/text.py` — `indices = set(vocabulary.values())`, O(1). CLEAN.
- `sklearn/feature_extraction/_dict_vectorizer.py` — `vocab` is a dict, O(1). CLEAN.
- `sklearn/externals/_arff.py` — `NominalConversor.values = set(values)`, O(1). CLEAN.
- `sklearn/compose/_column_transformer.py` — `transformer_names` is a set. CLEAN.
- `sklearn/metrics/_classification.py` — `present_labels` is numpy array; `in` on numpy is expected O(N) scan for small label sets, not a hot-path quadratic. CLEAN.
No CWE-407 defects found in scikit-learn 1.x.