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fix(chroma): add missing Euclidean relevance-score function #31643

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fix(chroma): add missing Euclidean relevance-score function #31643

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fix(chroma): add missing Euclidean relevance-score function
mohiuddin-khan-shiam Jun 17, 2025
4c8d802
Merge branch 'master' of https://github.com/mohiuddin-khan-shiam/lang…
mohiuddin-khan-shiam Jun 17, 2025
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10 changes: 10 additions & 0 deletions libs/partners/chroma/langchain_chroma/vectorstores.py
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Original file line number Diff line number Diff line change
Expand Up @@ -753,6 +753,16 @@ def similarity_search_with_vectors(

return _results_to_docs_and_vectors(results)

@staticmethod
def _euclidean_relevance_score_fn(distance: float) -> float:
"""Normalize Euclidean (L2) distance to a [0, 1] relevance score.

Uses the transformation ``1 / (1 + distance)`` so that:
* distance == 0 -> score == 1 (most relevant)
* distance -> ∞ -> score -> 0 (least relevant)
"""
return 1.0 / (1.0 + float(distance))

def _select_relevance_score_fn(self) -> Callable[[float], float]:
"""Select the relevance score function based on collections distance metric.

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