Module rrf 

Reciprocal Rank Fusion (RRF) for combining multiple ranked result sets.

RRF is a simple but effective fusion method: score(d) = Σ 1/(k + rank_i(d)) where k is a constant (typically 60).

Functions

rrf_fuse

Fuse multiple ranked result lists using Reciprocal Rank Fusion.

rrf_fuse_weighted

Weighted RRF — each result set multiplies its rank contribution by weight.