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

Example 31 with Explanation

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

the class ExpressionValueSource method explain.

@Override
public Explanation explain(LeafReaderContext ctx, int docId, Explanation scoreExplanation) throws IOException {
    Explanation[] explanations = new Explanation[variables.length];
    DoubleValues dv = getValues(ctx, DoubleValuesSource.constant(scoreExplanation.getValue()).getValues(ctx, null));
    if (dv.advanceExact(docId) == false) {
        return Explanation.noMatch(expression.sourceText);
    }
    int i = 0;
    for (DoubleValuesSource var : variables) {
        explanations[i++] = var.explain(ctx, docId, scoreExplanation);
    }
    return Explanation.match((float) dv.doubleValue(), expression.sourceText + ", computed from:", explanations);
}

Example 32 with Explanation

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

the class BBoxSimilarityValueSource method getValues.

@Override
public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException {
    final FunctionValues shapeValues = bboxValueSource.getValues(context, readerContext);
    return new DoubleDocValues(this) {

        @Override
        public double doubleVal(int doc) throws IOException {
            //? limit to Rect or call getBoundingBox()? latter would encourage bad practice
            final Rectangle rect = (Rectangle) shapeValues.objectVal(doc);
            return rect == null ? 0 : score(rect, null);
        }

        @Override
        public boolean exists(int doc) throws IOException {
            return shapeValues.exists(doc);
        }

        @Override
        public Explanation explain(int doc) throws IOException {
            final Rectangle rect = (Rectangle) shapeValues.objectVal(doc);
            if (rect == null) {
                return Explanation.noMatch("no rect");
            }
            AtomicReference<Explanation> explanation = new AtomicReference<>();
            score(rect, explanation);
            return explanation.get();
        }
    };
}

Example 33 with Explanation

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

the class SpanWeight method explain.

@Override
public Explanation explain(LeafReaderContext context, int doc) throws IOException {
    SpanScorer scorer = scorer(context);
    if (scorer != null) {
        int newDoc = scorer.iterator().advance(doc);
        if (newDoc == doc) {
            float freq = scorer.sloppyFreq();
            SimScorer docScorer = similarity.simScorer(simWeight, context);
            Explanation freqExplanation = Explanation.match(freq, "phraseFreq=" + freq);
            Explanation scoreExplanation = docScorer.explain(doc, freqExplanation);
            return Explanation.match(scoreExplanation.getValue(), "weight(" + getQuery() + " in " + doc + ") [" + similarity.getClass().getSimpleName() + "], result of:", scoreExplanation);
        }
    }
    return Explanation.noMatch("no matching term");
}

Example 34 with Explanation

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

the class BM25Similarity method computeWeight.

@Override
public final SimWeight computeWeight(float boost, CollectionStatistics collectionStats, TermStatistics... termStats) {
    Explanation idf = termStats.length == 1 ? idfExplain(collectionStats, termStats[0]) : idfExplain(collectionStats, termStats);
    float avgdl = avgFieldLength(collectionStats);
    float[] oldCache = new float[256];
    float[] cache = new float[256];
    for (int i = 0; i < cache.length; i++) {
        oldCache[i] = k1 * ((1 - b) + b * OLD_LENGTH_TABLE[i] / avgdl);
        cache[i] = k1 * ((1 - b) + b * LENGTH_TABLE[i] / avgdl);
    }
    return new BM25Stats(collectionStats.field(), boost, idf, avgdl, oldCache, cache);
}

Example 35 with Explanation

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

the class BM25Similarity 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> details = new ArrayList<>();
    for (final TermStatistics stat : termStats) {
        Explanation idfExplain = idfExplain(collectionStats, stat);
        details.add(idfExplain);
        idf += idfExplain.getValue();
    }
    return Explanation.match((float) idf, "idf(), sum of:", details);
}