Bm25Scorer

Namespace

Rowles.LeanCorpus.Search.Scoring

Assembly

Rowles.LeanCorpus.dll

BM25 scorer. Computes relevance scores for term matches.

public static class Bm25Scorer

Inheritance

object

Bm25Scorer

Idf(int, int)

Precomputes the IDF component (constant for a given term across all documents).

NormaliseFieldTermFrequency(float, int, float, float)

Normalises a field term frequency for BM25F-style combined-field scoring before cross-field aggregation.

PrecomputeFactors(int, int, float)

Precomputes factors that are constant for a given field/term. Returns (idf, k1BOverAvgDL) where k1BOverAvgDL = K1 * B / avgDocLength.

Score(int, int, float, int, int)

Computes the BM25 score for a single term in a single document.

ScoreCombinedWithIdf(float, float)

Scores a BM25F-style pseudo term frequency using a precomputed IDF.

ScorePrecomputed(float, float, int, int)

Scores with precomputed IDF and normalisation factor. Avoids per-doc division.

ScorePrecomputedBatch(float, float, ReadOnlySpan<int>, ReadOnlySpan<int>, Span<float>)

Scores multiple documents at once using SIMD for a shared IDF term.