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.
- Args:
score_field: A unique string to identify the search being ranked penalty: A non-negative float. extra_fields: Any fields other than text_field that one wishes to keep.
- Returns:
RRF score :=
rac{1}{rank + penalty} with rank in [1,2,..,n]
- Parameters:
score_field (str)
penalty (float)
kwargs (Any)
- Return type:
List[Dict[str, Any]]