reciprocal_rank_stage#

langchain_mongodb.pipelines.reciprocal_rank_stage(
score_field: str,
penalty: float = 0,
**kwargs: Any,
) → List[Dict[str, Any]][source]#

Stage adds Reciprocal Rank Fusion weighting.

First, it pushes documents retrieved from previous stage into a temporary sub-document. It then unwinds to establish the rank to each and applies the penalty.

Parameters:

  • score_field (str) – A unique string to identify the search being ranked

  • penalty (float) – A non-negative float.

  • extra_fields – Any fields other than text_field that one wishes to keep.

  • kwargs (Any)

Returns:

RRF score

Return type:

List[Dict[str, Any]]