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From cutt...@apache.org
Subject cvs commit: jakarta-lucene/src/java/org/apache/lucene/search BooleanQuery.java BooleanScorer.java IndexSearcher.java PhrasePrefixQuery.java PhraseQuery.java PhraseScorer.java TermQuery.java TermScorer.java Weight.java
Date Wed, 15 Jan 2003 19:25:05 GMT
cutting     2003/01/15 11:25:05

  Modified:    src/java/org/apache/lucene/search BooleanQuery.java
                        BooleanScorer.java IndexSearcher.java
                        PhrasePrefixQuery.java PhraseQuery.java
                        PhraseScorer.java TermQuery.java TermScorer.java
                        Weight.java
  Log:
  Revised explanation format so that it better corresponds to a dot product of tf*idf weights.
  
  Revision  Changes    Path
  1.11      +41 -6     jakarta-lucene/src/java/org/apache/lucene/search/BooleanQuery.java
  
  Index: BooleanQuery.java
  ===================================================================
  RCS file: /home/cvs/jakarta-lucene/src/java/org/apache/lucene/search/BooleanQuery.java,v
  retrieving revision 1.10
  retrieving revision 1.11
  diff -u -r1.10 -r1.11
  --- BooleanQuery.java	14 Jan 2003 21:57:30 -0000	1.10
  +++ BooleanQuery.java	15 Jan 2003 19:25:04 -0000	1.11
  @@ -150,13 +150,48 @@
         return result;
       }
   
  -    public Explanation explain() throws IOException {
  -      Explanation result = new Explanation();
  -      result.setDescription("boost(" + getQuery() + ")");
  -      result.setValue(getBoost());
  -      return result;
  -    }
  +    public Explanation explain(IndexReader reader, int doc)
  +      throws IOException {
  +      Explanation sumExpl = new Explanation();
  +      sumExpl.setDescription("sum of:");
  +      int coord = 0;
  +      int maxCoord = 0;
  +      float sum = 0.0f;
  +      for (int i = 0 ; i < weights.size(); i++) {
  +        BooleanClause c = (BooleanClause)clauses.elementAt(0);
  +        Weight w = (Weight)weights.elementAt(i);
  +        Explanation e = w.explain(reader, doc);
  +        if (!c.prohibited) maxCoord++;
  +        if (e.getValue() > 0) {
  +          if (!c.prohibited) {
  +            sumExpl.addDetail(e);
  +            sum += e.getValue();
  +            coord++;
  +          } else {
  +            return new Explanation(0.0f, "match prohibited");
  +          }
  +        } else if (c.required) {
  +          return new Explanation(0.0f, "match required");
  +        }
  +      }
  +      sumExpl.setValue(sum);
  +
  +      if (coord == 1)                               // only one clause matched
  +        sumExpl = sumExpl.getDetails()[0];          // eliminate wrapper
   
  +      float coordFactor = searcher.getSimilarity().coord(coord, maxCoord);
  +      if (coordFactor == 1.0f)                      // coord is no-op
  +        return sumExpl;                             // eliminate wrapper
  +      else {
  +        Explanation result = new Explanation();
  +        result.setDescription("product of:");
  +        result.addDetail(sumExpl);
  +        result.addDetail(new Explanation(coordFactor,
  +                                         "coord("+coord+"/"+maxCoord+")"));
  +        result.setValue(sum*coordFactor);
  +        return result;
  +      }
  +    }
     }
   
     protected Weight createWeight(Searcher searcher) {
  
  
  
  1.4       +1 -35     jakarta-lucene/src/java/org/apache/lucene/search/BooleanScorer.java
  
  Index: BooleanScorer.java
  ===================================================================
  RCS file: /home/cvs/jakarta-lucene/src/java/org/apache/lucene/search/BooleanScorer.java,v
  retrieving revision 1.3
  retrieving revision 1.4
  diff -u -r1.3 -r1.4
  --- BooleanScorer.java	13 Jan 2003 23:50:33 -0000	1.3
  +++ BooleanScorer.java	15 Jan 2003 19:25:04 -0000	1.4
  @@ -208,41 +208,7 @@
     }
   
     public Explanation explain(int doc) throws IOException {
  -    Explanation sumExpl = new Explanation();
  -    sumExpl.setDescription("sum of:");
  -    int coord = 0;
  -    float sum = 0.0f;
  -    for (SubScorer s = scorers; s != null; s = s.next) {
  -      Explanation e = s.scorer.explain(doc);
  -      if (e.getValue() > 0) {
  -        if (!s.prohibited) {
  -          sumExpl.addDetail(e);
  -          sum += e.getValue();
  -          coord++;
  -        } else {
  -          return new Explanation(0.0f, "match prohibited");
  -        }
  -      } else if (s.required) {
  -        return new Explanation(0.0f, "match required");
  -      }
  -    }
  -    sumExpl.setValue(sum);
  -
  -    if (coord == 1)                               // only one clause matched
  -      sumExpl = sumExpl.getDetails()[0];          // eliminate wrapper
  -
  -    float coordFactor = getSimilarity().coord(coord, maxCoord-1);
  -    if (coordFactor == 1.0f)                      // coord is no-op
  -      return sumExpl;                             // eliminate wrapper
  -    else {
  -      Explanation result = new Explanation();
  -      result.setDescription("product of:");
  -      result.addDetail(sumExpl);
  -      result.addDetail(new Explanation(coordFactor,
  -                                       "coord("+coord+"/"+(maxCoord-1)+")"));
  -      result.setValue(sum*coordFactor);
  -      return result;
  -    }
  +    throw new UnsupportedOperationException();
     }
   
   }
  
  
  
  1.7       +1 -1      jakarta-lucene/src/java/org/apache/lucene/search/IndexSearcher.java
  
  Index: IndexSearcher.java
  ===================================================================
  RCS file: /home/cvs/jakarta-lucene/src/java/org/apache/lucene/search/IndexSearcher.java,v
  retrieving revision 1.6
  retrieving revision 1.7
  diff -u -r1.6 -r1.7
  --- IndexSearcher.java	14 Jan 2003 00:04:37 -0000	1.6
  +++ IndexSearcher.java	15 Jan 2003 19:25:04 -0000	1.7
  @@ -197,7 +197,7 @@
     }
   
     public Explanation explain(Query query, int doc) throws IOException {
  -    return query.weight(this).scorer(reader).explain(doc);
  +    return query.weight(this).explain(reader, doc);
     }
   
   }
  
  
  
  1.7       +51 -18    jakarta-lucene/src/java/org/apache/lucene/search/PhrasePrefixQuery.java
  
  Index: PhrasePrefixQuery.java
  ===================================================================
  RCS file: /home/cvs/jakarta-lucene/src/java/org/apache/lucene/search/PhrasePrefixQuery.java,v
  retrieving revision 1.6
  retrieving revision 1.7
  diff -u -r1.6 -r1.7
  --- PhrasePrefixQuery.java	14 Jan 2003 21:57:30 -0000	1.6
  +++ PhrasePrefixQuery.java	15 Jan 2003 19:25:04 -0000	1.7
  @@ -125,6 +125,7 @@
       private float value;
       private float idf;
       private float queryNorm;
  +    private float queryWeight;
   
       public PhrasePrefixWeight(Searcher searcher) {
         this.searcher = searcher;
  @@ -141,14 +142,14 @@
             idf += searcher.getSimilarity().idf(terms[j], searcher);
         }
   
  -      value = idf * getBoost();
  -      return value * value;
  +      queryWeight = idf * getBoost();             // compute query weight
  +      return queryWeight * queryWeight;           // square it
       }
   
  -    public void normalize(float norm) {
  -      queryNorm = norm;
  -      queryNorm *= idf;                           // factor from document
  -      value *= queryNorm;                         // normalize for query
  +    public void normalize(float queryNorm) {
  +      this.queryNorm = queryNorm;
  +      queryWeight *= queryNorm;                   // normalize query weight
  +      value = queryWeight * idf;                  // idf for document 
       }
   
       public Scorer scorer(IndexReader reader) throws IOException {
  @@ -179,25 +180,57 @@
                                         slop, reader.norms(field));
       }
       
  -    public Explanation explain() throws IOException {
  -      Query q = getQuery();
  -
  +    public Explanation explain(IndexReader reader, int doc)
  +      throws IOException {
         Explanation result = new Explanation();
  -      result.setDescription("weight(" + getQuery() + "), product of:");
  +      result.setDescription("weight("+getQuery()+" in "+doc+"), product of:");
  +
  +      Explanation idfExpl = new Explanation(idf, "idf("+getQuery()+")");
  +      
  +      // explain query weight
  +      Explanation queryExpl = new Explanation();
  +      queryExpl.setDescription("queryWeight(" + getQuery() + "), product of:");
   
         Explanation boostExpl = new Explanation(getBoost(), "boost");
         if (getBoost() != 1.0f)
  -        result.addDetail(boostExpl);
  +        queryExpl.addDetail(boostExpl);
  +
  +      queryExpl.addDetail(idfExpl);
  +      
  +      Explanation queryNormExpl = new Explanation(queryNorm,"queryNorm");
  +      queryExpl.addDetail(queryNormExpl);
         
  -      Explanation idfExpl = new Explanation(idf, "idf");
  -      result.addDetail(idfExpl);
  +      queryExpl.setValue(boostExpl.getValue() *
  +                         idfExpl.getValue() *
  +                         queryNormExpl.getValue());
  +
  +      result.addDetail(queryExpl);
  +     
  +      // explain field weight
  +      Explanation fieldExpl = new Explanation();
  +      fieldExpl.setDescription("fieldWeight("+getQuery()+" in "+doc+
  +                               "), product of:");
  +
  +      Explanation tfExpl = scorer(reader).explain(doc);
  +      fieldExpl.addDetail(tfExpl);
  +      fieldExpl.addDetail(idfExpl);
  +
  +      Explanation fieldNormExpl = new Explanation();
  +      fieldNormExpl.setValue(Similarity.decodeNorm(reader.norms(field)[doc]));
  +      fieldNormExpl.setDescription("fieldNorm(field="+field+", doc="+doc+")");
  +      fieldExpl.addDetail(fieldNormExpl);
  +
  +      fieldExpl.setValue(tfExpl.getValue() *
  +                         idfExpl.getValue() *
  +                         fieldNormExpl.getValue());
         
  -      Explanation normExpl = new Explanation(queryNorm, "queryNorm");
  -      result.addDetail(normExpl);
  +      result.addDetail(fieldExpl);
  +
  +      // combine them
  +      result.setValue(queryExpl.getValue() * fieldExpl.getValue());
   
  -      result.setValue(boostExpl.getValue() *
  -                      idfExpl.getValue() *
  -                      normExpl.getValue());
  +      if (queryExpl.getValue() == 1.0f)
  +        return fieldExpl;
   
         return result;
       }
  
  
  
  1.10      +67 -22    jakarta-lucene/src/java/org/apache/lucene/search/PhraseQuery.java
  
  Index: PhraseQuery.java
  ===================================================================
  RCS file: /home/cvs/jakarta-lucene/src/java/org/apache/lucene/search/PhraseQuery.java,v
  retrieving revision 1.9
  retrieving revision 1.10
  diff -u -r1.9 -r1.10
  --- PhraseQuery.java	14 Jan 2003 21:57:30 -0000	1.9
  +++ PhraseQuery.java	15 Jan 2003 19:25:04 -0000	1.10
  @@ -112,6 +112,7 @@
       private float value;
       private float idf;
       private float queryNorm;
  +    private float queryWeight;
   
       public PhraseWeight(Searcher searcher) {
         this.searcher = searcher;
  @@ -122,14 +123,14 @@
   
       public float sumOfSquaredWeights() throws IOException {
         idf = searcher.getSimilarity().idf(terms, searcher);
  -      value = idf * getBoost();
  -      return value * value;			  // square term weights
  +      queryWeight = idf * getBoost();             // compute query weight
  +      return queryWeight * queryWeight;           // square it
       }
   
  -    public void normalize(float norm) {
  -      queryNorm = norm;
  -      queryNorm *= idf;                           // factor from document
  -      value *= queryNorm;                         // normalize for query
  +    public void normalize(float queryNorm) {
  +      this.queryNorm = queryNorm;
  +      queryWeight *= queryNorm;                   // normalize query weight
  +      value = queryWeight * idf;                  // idf for document 
       }
   
       public Scorer scorer(IndexReader reader) throws IOException {
  @@ -154,33 +155,77 @@
         
       }
   
  -    public Explanation explain() throws IOException {
  -      Query q = getQuery();
  +    public Explanation explain(IndexReader reader, int doc)
  +      throws IOException {
   
         Explanation result = new Explanation();
  -      result.setDescription("weight(" + getQuery() + "), product of:");
  +      result.setDescription("weight("+getQuery()+" in "+doc+"), product of:");
   
  -      Explanation boostExpl = new Explanation(getBoost(), "boost");
  -      if (getBoost() != 1.0f)
  -        result.addDetail(boostExpl);
  -      
         StringBuffer docFreqs = new StringBuffer();
  +      StringBuffer query = new StringBuffer();
  +      query.append('\"');
         for (int i = 0; i < terms.size(); i++) {
  -        if (i != 0) docFreqs.append(" ");
  -        docFreqs.append(((Term)terms.elementAt(i)).text());
  +        if (i != 0) {
  +          docFreqs.append(" ");
  +          query.append(" ");
  +        }
  +
  +        Term term = (Term)terms.elementAt(i);
  +
  +        docFreqs.append(term.text());
           docFreqs.append("=");
  -        docFreqs.append(searcher.docFreq((Term)terms.elementAt(i)));
  +        docFreqs.append(searcher.docFreq(term));
  +
  +        query.append(term.text());
         }
  +      query.append('\"');
  +
         Explanation idfExpl =
           new Explanation(idf, "idf(" + field + ": " + docFreqs + ")");
  -      result.addDetail(idfExpl);
         
  -      Explanation normExpl = new Explanation(queryNorm, "queryNorm");
  -      result.addDetail(normExpl);
  +      // explain query weight
  +      Explanation queryExpl = new Explanation();
  +      queryExpl.setDescription("queryWeight(" + getQuery() + "), product of:");
  +
  +      Explanation boostExpl = new Explanation(getBoost(), "boost");
  +      if (getBoost() != 1.0f)
  +        queryExpl.addDetail(boostExpl);
  +      queryExpl.addDetail(idfExpl);
  +      
  +      Explanation queryNormExpl = new Explanation(queryNorm,"queryNorm");
  +      queryExpl.addDetail(queryNormExpl);
  +      
  +      queryExpl.setValue(boostExpl.getValue() *
  +                         idfExpl.getValue() *
  +                         queryNormExpl.getValue());
  +
  +      result.addDetail(queryExpl);
  +     
  +      // explain field weight
  +      Explanation fieldExpl = new Explanation();
  +      fieldExpl.setDescription("fieldWeight("+field+":"+query+" in "+doc+
  +                               "), product of:");
  +
  +      Explanation tfExpl = scorer(reader).explain(doc);
  +      fieldExpl.addDetail(tfExpl);
  +      fieldExpl.addDetail(idfExpl);
  +
  +      Explanation fieldNormExpl = new Explanation();
  +      fieldNormExpl.setValue(Similarity.decodeNorm(reader.norms(field)[doc]));
  +      fieldNormExpl.setDescription("fieldNorm(field="+field+", doc="+doc+")");
  +      fieldExpl.addDetail(fieldNormExpl);
  +
  +      fieldExpl.setValue(tfExpl.getValue() *
  +                         idfExpl.getValue() *
  +                         fieldNormExpl.getValue());
  +      
  +      result.addDetail(fieldExpl);
  +
  +      // combine them
  +      result.setValue(queryExpl.getValue() * fieldExpl.getValue());
   
  -      result.setValue(boostExpl.getValue() *
  -                      idfExpl.getValue() *
  -                      normExpl.getValue());
  +      if (queryExpl.getValue() == 1.0f)
  +        return fieldExpl;
   
         return result;
       }
  
  
  
  1.6       +2 -20     jakarta-lucene/src/java/org/apache/lucene/search/PhraseScorer.java
  
  Index: PhraseScorer.java
  ===================================================================
  RCS file: /home/cvs/jakarta-lucene/src/java/org/apache/lucene/search/PhraseScorer.java,v
  retrieving revision 1.5
  retrieving revision 1.6
  diff -u -r1.5 -r1.6
  --- PhraseScorer.java	13 Jan 2003 23:50:33 -0000	1.5
  +++ PhraseScorer.java	15 Jan 2003 19:25:04 -0000	1.6
  @@ -130,15 +130,8 @@
     }
   
     public Explanation explain(final int doc) throws IOException {
  -    Explanation result = new Explanation();
  -    PhraseQuery query = (PhraseQuery)weight.getQuery();
  -
  -    result.setDescription("phraseScore(" + query + "), product of:");
  -    
  -    Explanation weightExplanation = weight.explain();
  -    result.addDetail(weightExplanation);
  -
       Explanation tfExplanation = new Explanation();
  +
       score(new HitCollector() {
           public final void collect(int d, float score) {}
         }, doc+1);
  @@ -146,19 +139,8 @@
       float phraseFreq = (first.doc == doc) ? freq : 0.0f;
       tfExplanation.setValue(getSimilarity().tf(phraseFreq));
       tfExplanation.setDescription("tf(phraseFreq=" + phraseFreq + ")");
  -    result.addDetail(tfExplanation);
  -    
  -    Explanation normExplanation = new Explanation();
  -    normExplanation.setValue(Similarity.decodeNorm(norms[doc]));
  -    String field = query.getTerms()[0].field();
  -    normExplanation.setDescription("norm(field="+field + ", doc="+doc + ")");
  -    result.addDetail(normExplanation);
   
  -    result.setValue(weightExplanation.getValue() *
  -                    tfExplanation.getValue() *
  -                    normExplanation.getValue());
  -    
  -    return result;
  +    return tfExplanation;
     }
   
   }
  
  
  
  1.7       +53 -19    jakarta-lucene/src/java/org/apache/lucene/search/TermQuery.java
  
  Index: TermQuery.java
  ===================================================================
  RCS file: /home/cvs/jakarta-lucene/src/java/org/apache/lucene/search/TermQuery.java,v
  retrieving revision 1.6
  retrieving revision 1.7
  diff -u -r1.6 -r1.7
  --- TermQuery.java	14 Jan 2003 00:22:09 -0000	1.6
  +++ TermQuery.java	15 Jan 2003 19:25:04 -0000	1.7
  @@ -70,6 +70,7 @@
       private float value;
       private float idf;
       private float queryNorm;
  +    private float queryWeight;
   
       public TermWeight(Searcher searcher) {
         this.searcher = searcher;
  @@ -79,15 +80,15 @@
       public float getValue() { return value; }
   
       public float sumOfSquaredWeights() throws IOException {
  -      idf = searcher.getSimilarity().idf(term, searcher);
  -      value = idf * getBoost();
  -      return value * value;			  // square term weights
  +      idf = searcher.getSimilarity().idf(term, searcher); // compute idf
  +      queryWeight = idf * getBoost();             // compute query weight
  +      return queryWeight * queryWeight;           // square it
       }
   
  -    public void normalize(float norm) {
  -      queryNorm = norm;
  -      queryNorm *= idf;                           // factor from document
  -      value *= queryNorm;                         // normalize for query
  +    public void normalize(float queryNorm) {
  +      this.queryNorm = queryNorm;
  +      queryWeight *= queryNorm;                   // normalize query weight
  +      value = queryWeight * idf;                  // idf for document 
       }
   
       public Scorer scorer(IndexReader reader) throws IOException {
  @@ -100,26 +101,59 @@
                               reader.norms(term.field()));
       }
   
  -    public Explanation explain() throws IOException {
  -      Query q = getQuery();
  +    public Explanation explain(IndexReader reader, int doc)
  +      throws IOException {
   
         Explanation result = new Explanation();
  -      result.setDescription("weight(" + getQuery() + "), product of:");
  +      result.setDescription("weight("+getQuery()+" in "+doc+"), product of:");
  +
  +      Explanation idfExpl =
  +        new Explanation(idf, "idf(docFreq=" + searcher.docFreq(term) + ")");
  +
  +      // explain query weight
  +      Explanation queryExpl = new Explanation();
  +      queryExpl.setDescription("queryWeight(" + getQuery() + "), product of:");
   
         Explanation boostExpl = new Explanation(getBoost(), "boost");
         if (getBoost() != 1.0f)
  -        result.addDetail(boostExpl);
  +        queryExpl.addDetail(boostExpl);
  +      queryExpl.addDetail(idfExpl);
         
  -      Explanation idfExpl =
  -        new Explanation(idf, "idf(docFreq=" + searcher.docFreq(term) + ")");
  -      result.addDetail(idfExpl);
  +      Explanation queryNormExpl = new Explanation(queryNorm,"queryNorm");
  +      queryExpl.addDetail(queryNormExpl);
         
  -      Explanation normExpl = new Explanation(queryNorm,"queryNorm");
  -      result.addDetail(normExpl);
  +      queryExpl.setValue(boostExpl.getValue() *
  +                         idfExpl.getValue() *
  +                         queryNormExpl.getValue());
  +
  +      result.addDetail(queryExpl);
  +     
  +      // explain field weight
  +      String field = term.field();
  +      Explanation fieldExpl = new Explanation();
  +      fieldExpl.setDescription("fieldWeight("+term+" in "+doc+
  +                               "), product of:");
  +
  +      Explanation tfExpl = scorer(reader).explain(doc);
  +      fieldExpl.addDetail(tfExpl);
  +      fieldExpl.addDetail(idfExpl);
  +
  +      Explanation fieldNormExpl = new Explanation();
  +      fieldNormExpl.setValue(Similarity.decodeNorm(reader.norms(field)[doc]));
  +      fieldNormExpl.setDescription("fieldNorm(field="+field+", doc="+doc+")");
  +      fieldExpl.addDetail(fieldNormExpl);
  +
  +      fieldExpl.setValue(tfExpl.getValue() *
  +                         idfExpl.getValue() *
  +                         fieldNormExpl.getValue());
  +      
  +      result.addDetail(fieldExpl);
  +
  +      // combine them
  +      result.setValue(queryExpl.getValue() * fieldExpl.getValue());
   
  -      result.setValue(boostExpl.getValue() *
  -                      idfExpl.getValue() *
  -                      normExpl.getValue());
  +      if (queryExpl.getValue() == 1.0f)
  +        return fieldExpl;
   
         return result;
       }
  
  
  
  1.5       +1 -19     jakarta-lucene/src/java/org/apache/lucene/search/TermScorer.java
  
  Index: TermScorer.java
  ===================================================================
  RCS file: /home/cvs/jakarta-lucene/src/java/org/apache/lucene/search/TermScorer.java,v
  retrieving revision 1.4
  retrieving revision 1.5
  diff -u -r1.4 -r1.5
  --- TermScorer.java	13 Jan 2003 23:50:33 -0000	1.4
  +++ TermScorer.java	15 Jan 2003 19:25:04 -0000	1.5
  @@ -124,14 +124,7 @@
     }
   
     public Explanation explain(int doc) throws IOException {
  -    Explanation result = new Explanation();
       TermQuery query = (TermQuery)weight.getQuery();
  -
  -    result.setDescription("termScore(" + query + "), product of:");
  -    
  -    Explanation weightExplanation = weight.explain();
  -    result.addDetail(weightExplanation);
  -
       Explanation tfExplanation = new Explanation();
       int tf = 0;
       while (pointer < pointerMax) {
  @@ -149,18 +142,7 @@
       termDocs.close();
       tfExplanation.setValue(getSimilarity().tf(tf));
       tfExplanation.setDescription("tf(termFreq("+query.getTerm()+")="+tf+")");
  -    result.addDetail(tfExplanation);
  -    
  -    Explanation normExplanation = new Explanation();
  -    normExplanation.setValue(Similarity.decodeNorm(norms[doc]));
  -    String field = query.getTerm().field();
  -    normExplanation.setDescription("norm(field="+field + ", doc="+doc + ")");
  -    result.addDetail(normExplanation);
  -
  -    result.setValue(weightExplanation.getValue() *
  -                    tfExplanation.getValue() *
  -                    normExplanation.getValue());
       
  -    return result;
  +    return tfExplanation;
     }
   }
  
  
  
  1.2       +2 -2      jakarta-lucene/src/java/org/apache/lucene/search/Weight.java
  
  Index: Weight.java
  ===================================================================
  RCS file: /home/cvs/jakarta-lucene/src/java/org/apache/lucene/search/Weight.java,v
  retrieving revision 1.1
  retrieving revision 1.2
  diff -u -r1.1 -r1.2
  --- Weight.java	13 Jan 2003 23:50:33 -0000	1.1
  +++ Weight.java	15 Jan 2003 19:25:04 -0000	1.2
  @@ -83,6 +83,6 @@
     /** Constructs a scorer for this. */
     Scorer scorer(IndexReader reader) throws IOException;
   
  -  /** An explanation of this weight computation. */
  -  Explanation explain() throws IOException;
  +  /** An explanation of the score computation for the named document. */
  +  Explanation explain(IndexReader reader, int doc) throws IOException;
   }
  
  
  

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