reciprocal_rank_stage

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

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]]