fastrag.retrieval.hybrid

Composable hybrid retrieval with replaceable ranking fusion.

Classes

HybridRetriever(*, retrievers[, fusion, ...])

Fetch candidates from each retriever concurrently, then fuse their ranks.

class fastrag.retrieval.hybrid.HybridRetriever(*, retrievers, fusion=None, candidate_k=40)

Bases: Retriever

Fetch candidates from each retriever concurrently, then fuse their ranks.

Parameters:

• retrievers (Sequence[Retriever])

• fusion (RankFusion | None)

• candidate_k (int)

async retrieve(query, *, k=5)

Fuse the candidate rankings down to k documents.

Parameters:

• query (str)

• k (int)

Return type:

list[Document]