Ejemplo n.º 1
0
            public override Explanation Explain(IndexReader reader, int doc)
            {
                ComplexExplanation result = new ComplexExplanation();

                result.Description = "weight(" + Query + " in " + doc + "), product of:";

                Explanation idfExpl = new Explanation(idf, "idf(" + Query + ")");

                // explain query weight
                Explanation queryExpl = new Explanation();

                queryExpl.Description = "queryWeight(" + Query + "), product of:";

                Explanation boostExpl = new Explanation(Enclosing_Instance.Boost, "boost");

                if (Enclosing_Instance.Boost != 1.0f)
                {
                    queryExpl.AddDetail(boostExpl);
                }

                queryExpl.AddDetail(idfExpl);

                Explanation queryNormExpl = new Explanation(queryNorm, "queryNorm");

                queryExpl.AddDetail(queryNormExpl);

                queryExpl.Value = boostExpl.Value * idfExpl.Value * queryNormExpl.Value;

                result.AddDetail(queryExpl);

                // explain field weight
                ComplexExplanation fieldExpl = new ComplexExplanation();

                fieldExpl.Description = "fieldWeight(" + Query + " in " + doc + "), product of:";

                PhraseScorer scorer = (PhraseScorer)Scorer(reader, true, false);

                if (scorer == null)
                {
                    return(new Explanation(0.0f, "no matching docs"));
                }
                Explanation tfExplanation = new Explanation();
                int         d             = scorer.Advance(doc);
                float       phraseFreq    = (d == doc) ? scorer.CurrentFreq() : 0.0f;

                tfExplanation.Value       = similarity.Tf(phraseFreq);
                tfExplanation.Description = "tf(phraseFreq=" + phraseFreq + ")";
                fieldExpl.AddDetail(tfExplanation);
                fieldExpl.AddDetail(idfExpl);

                Explanation fieldNormExpl = new Explanation();

                byte[] fieldNorms = reader.Norms(Enclosing_Instance.field);
                float  fieldNorm  = fieldNorms != null?Similarity.DecodeNorm(fieldNorms[doc]) : 1.0f;

                fieldNormExpl.Value       = fieldNorm;
                fieldNormExpl.Description = "fieldNorm(field=" + Enclosing_Instance.field + ", doc=" + doc + ")";
                fieldExpl.AddDetail(fieldNormExpl);

                fieldExpl.Match = tfExplanation.IsMatch;
                fieldExpl.Value = tfExplanation.Value * idfExpl.Value * fieldNormExpl.Value;

                result.AddDetail(fieldExpl);
                System.Boolean?tempAux = fieldExpl.Match;
                result.Match = tempAux;

                // combine them
                result.Value = queryExpl.Value * fieldExpl.Value;

                if (queryExpl.Value == 1.0f)
                {
                    return(fieldExpl);
                }

                return(result);
            }
Ejemplo n.º 2
0
            public override Explanation Explain(IndexReader reader, int doc)
            {
                Explanation result = new Explanation();

                result.Description = "weight(" + Query + " in " + doc + "), product of:";

                System.Text.StringBuilder docFreqs = new System.Text.StringBuilder();
                System.Text.StringBuilder query    = new System.Text.StringBuilder();
                query.Append('\"');
                docFreqs.Append(idfExp.Explain());
                for (int i = 0; i < Enclosing_Instance.terms.Count; i++)
                {
                    if (i != 0)
                    {
                        query.Append(" ");
                    }

                    Term term = Enclosing_Instance.terms[i];

                    query.Append(term.Text);
                }
                query.Append('\"');

                Explanation idfExpl = new Explanation(idf, "idf(" + Enclosing_Instance.field + ":" + docFreqs + ")");

                // explain query weight
                Explanation queryExpl = new Explanation();

                queryExpl.Description = "queryWeight(" + Query + "), product of:";

                Explanation boostExpl = new Explanation(Enclosing_Instance.Boost, "boost");

                if (Enclosing_Instance.Boost != 1.0f)
                {
                    queryExpl.AddDetail(boostExpl);
                }
                queryExpl.AddDetail(idfExpl);

                Explanation queryNormExpl = new Explanation(queryNorm, "queryNorm");

                queryExpl.AddDetail(queryNormExpl);

                queryExpl.Value = boostExpl.Value * idfExpl.Value * queryNormExpl.Value;

                result.AddDetail(queryExpl);

                // explain field weight
                Explanation fieldExpl = new Explanation();

                fieldExpl.Description = "fieldWeight(" + Enclosing_Instance.field + ":" + query + " in " + doc + "), product of:";

                PhraseScorer scorer = (PhraseScorer)Scorer(reader, true, false);

                if (scorer == null)
                {
                    return(new Explanation(0.0f, "no matching docs"));
                }
                Explanation tfExplanation = new Explanation();
                int         d             = scorer.Advance(doc);
                float       phraseFreq    = (d == doc) ? scorer.CurrentFreq() : 0.0f;

                tfExplanation.Value       = similarity.Tf(phraseFreq);
                tfExplanation.Description = "tf(phraseFreq=" + phraseFreq + ")";

                fieldExpl.AddDetail(tfExplanation);
                fieldExpl.AddDetail(idfExpl);

                Explanation fieldNormExpl = new Explanation();

                byte[] fieldNorms = reader.Norms(Enclosing_Instance.field);
                float  fieldNorm  = fieldNorms != null?Similarity.DecodeNorm(fieldNorms[doc]) : 1.0f;

                fieldNormExpl.Value       = fieldNorm;
                fieldNormExpl.Description = "fieldNorm(field=" + Enclosing_Instance.field + ", doc=" + doc + ")";
                fieldExpl.AddDetail(fieldNormExpl);

                fieldExpl.Value = tfExplanation.Value * idfExpl.Value * fieldNormExpl.Value;

                result.AddDetail(fieldExpl);

                // combine them
                result.Value = queryExpl.Value * fieldExpl.Value;

                if (queryExpl.Value == 1.0f)
                {
                    return(fieldExpl);
                }

                return(result);
            }