Examples with Explanation org.apache.lucene.search.Explanation used on opensource projects

Example 36 with Explanation

use of org.apache.lucene.search.Explanation in project lucene-solr by apache.

the class IBSimilarity method explain.

@Override
protected void explain(List<Explanation> subs, BasicStats stats, int doc, float freq, float docLen) {
    if (stats.getBoost() != 1.0f) {
        subs.add(Explanation.match(stats.getBoost(), "boost"));
    }
    Explanation normExpl = normalization.explain(stats, freq, docLen);
    Explanation lambdaExpl = lambda.explain(stats);
    subs.add(normExpl);
    subs.add(lambdaExpl);
    subs.add(distribution.explain(stats, normExpl.getValue(), lambdaExpl.getValue()));
}

Example 37 with Explanation

use of org.apache.lucene.search.Explanation in project lucene-solr by apache.

the class BM25Similarity method explainScore.

private Explanation explainScore(int doc, Explanation freq, BM25Stats stats, NumericDocValues norms, float[] lengthCache) throws IOException {
    Explanation boostExpl = Explanation.match(stats.boost, "boost");
    List<Explanation> subs = new ArrayList<>();
    if (boostExpl.getValue() != 1.0f)
        subs.add(boostExpl);
    subs.add(stats.idf);
    Explanation tfNormExpl = explainTFNorm(doc, freq, stats, norms, lengthCache);
    subs.add(tfNormExpl);
    return Explanation.match(boostExpl.getValue() * stats.idf.getValue() * tfNormExpl.getValue(), "score(doc=" + doc + ",freq=" + freq + "), product of:", subs);
}

Example 38 with Explanation

use of org.apache.lucene.search.Explanation in project lucene-solr by apache.

the class TFIDFSimilarity method idfExplain.

/**
   * Computes a score factor for a phrase.
   * 
   * <p>
   * The default implementation sums the idf factor for
   * each term in the phrase.
   * 
   * @param collectionStats collection-level statistics
   * @param termStats term-level statistics for the terms in the phrase
   * @return an Explain object that includes both an idf 
   *         score factor for the phrase and an explanation 
   *         for each term.
   */
public Explanation idfExplain(CollectionStatistics collectionStats, TermStatistics[] termStats) {
    // sum into a double before casting into a float
    double idf = 0d;
    List<Explanation> subs = new ArrayList<>();
    for (final TermStatistics stat : termStats) {
        Explanation idfExplain = idfExplain(collectionStats, stat);
        subs.add(idfExplain);
        idf += idfExplain.getValue();
    }
    return Explanation.match((float) idf, "idf(), sum of:", subs);
}

Example 39 with Explanation

use of org.apache.lucene.search.Explanation in project elasticsearch by elastic.

the class SearchHit method buildExplanation.

private void buildExplanation(XContentBuilder builder, Explanation explanation) throws IOException {
    builder.startObject();
    builder.field(Fields.VALUE, explanation.getValue());
    builder.field(Fields.DESCRIPTION, explanation.getDescription());
    Explanation[] innerExps = explanation.getDetails();
    if (innerExps != null) {
        builder.startArray(Fields.DETAILS);
        for (Explanation exp : innerExps) {
            buildExplanation(builder, exp);
        }
        builder.endArray();
    }
    builder.endObject();
}

Example 40 with Explanation

use of org.apache.lucene.search.Explanation in project elasticsearch by elastic.

the class QueryRescorer method explain.

@Override
public Explanation explain(int topLevelDocId, SearchContext context, RescoreSearchContext rescoreContext, Explanation sourceExplanation) throws IOException {
    QueryRescoreContext rescore = (QueryRescoreContext) rescoreContext;
    ContextIndexSearcher searcher = context.searcher();
    if (sourceExplanation == null) {
        // this should not happen but just in case
        return Explanation.noMatch("nothing matched");
    }
    // TODO: this isn't right?  I.e., we are incorrectly pretending all first pass hits were rescored?  If the requested docID was
    // beyond the top rescoreContext.window() in the first pass hits, we don't rescore it now?
    Explanation rescoreExplain = searcher.explain(rescore.query(), topLevelDocId);
    float primaryWeight = rescore.queryWeight();
    Explanation prim;
    if (sourceExplanation.isMatch()) {
        prim = Explanation.match(sourceExplanation.getValue() * primaryWeight, "product of:", sourceExplanation, Explanation.match(primaryWeight, "primaryWeight"));
    } else {
        prim = Explanation.noMatch("First pass did not match", sourceExplanation);
    }
    // we should add QueryRescorer.explainCombine to Lucene?
    if (rescoreExplain != null && rescoreExplain.isMatch()) {
        float secondaryWeight = rescore.rescoreQueryWeight();
        Explanation sec = Explanation.match(rescoreExplain.getValue() * secondaryWeight, "product of:", rescoreExplain, Explanation.match(secondaryWeight, "secondaryWeight"));
        QueryRescoreMode scoreMode = rescore.scoreMode();
        return Explanation.match(scoreMode.combine(prim.getValue(), sec.getValue()), scoreMode + " of:", prim, sec);
    } else {
        return prim;
    }
}