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Make Boosting give more consistent scores #406

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Sep 6, 2023
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Make Boosting give more consistent scores #406

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11 changes: 9 additions & 2 deletions backend/danswer/search/semantic_search.py
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Original file line number Diff line number Diff line change
Expand Up @@ -55,19 +55,26 @@ def semantic_reranking(
query: str,
chunks: list[InferenceChunk],
) -> list[InferenceChunk]:
model_max = 12 # These are just based on observations from model selection
model_min = -12
cross_encoders = get_default_reranking_model_ensemble()
sim_scores = [
encoder.predict([(query, chunk.content) for chunk in chunks]) # type: ignore
for encoder in cross_encoders
]

cross_models_min = numpy.min(sim_scores)

shifted_sim_scores = sum(
[enc_n_scores - numpy.min(enc_n_scores) for enc_n_scores in sim_scores]
[enc_n_scores - cross_models_min for enc_n_scores in sim_scores]
) / len(sim_scores)

boosts = [translate_boost_count_to_multiplier(chunk.boost) for chunk in chunks]
boosted_sim_scores = shifted_sim_scores * boosts
scored_results = list(zip(boosted_sim_scores, chunks))
normalized_b_s_scores = (boosted_sim_scores + cross_models_min - model_min) / (
model_max - model_min
)
scored_results = list(zip(normalized_b_s_scores, chunks))
scored_results.sort(key=lambda x: x[0], reverse=True)
ranked_sim_scores, ranked_chunks = zip(*scored_results)

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