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feat: Rank symbol queries with BM25 only #308

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feat: Rank symbol queries with BM25 only #308

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2 changes: 1 addition & 1 deletion src/semble/ranking/boosting.py
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,7 @@
# Fraction of max_score added to each file's top chunk, scaled by its aggregate candidate score.
_FILE_COHERENCE_BOOST_FRAC = 0.2

_ALPHA_SYMBOL = 0.3 # lean BM25 for exact keyword matching
_ALPHA_SYMBOL = 0.0 # BM25 only: exact identifier lookups gain nothing from the dense list
_ALPHA_NL = 0.5 # balanced semantic + BM25

# Common English stopwords excluded from file-stem matching for NL queries.
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2 changes: 1 addition & 1 deletion tests/test_ranking.py
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Expand Up @@ -42,7 +42,7 @@ def test_rerank_topk_demotes_penalised_paths(penalised_path: str) -> None:
("query", "alpha_in", "expected"),
[
("MyService", 0.7, 0.7), # explicit value returned as-is
("MyService", None, 0.3), # symbol query → _ALPHA_SYMBOL
("MyService", None, 0.0), # symbol query → _ALPHA_SYMBOL
("how does routing work", None, 0.5), # NL query → _ALPHA_NL
],
)
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