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fix explain to factor in outer boost 

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1180599 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Robert Muir 2011-10-09 12:50:06 +00:00
parent c45396602a
commit 1912c6c9c6
1 changed files with 5 additions and 2 deletions
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7
lucene/src/java/org/apache/lucene/search/similarities/BM25Similarity.java
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@ -277,6 +277,8 @@ public class BM25Similarity extends Similarity {
private final float avgdl; private final float avgdl;
/** query's inner boost */ /** query's inner boost */
private final float queryBoost; private final float queryBoost;
/** query's outer boost (only for explain) */
private float topLevelBoost;
/** weight (idf * boost) */ /** weight (idf * boost) */
private float weight; private float weight;
/** precomputed norm[256] with k1 * ((1 - b) + b * dl / avgdl) */ /** precomputed norm[256] with k1 * ((1 - b) + b * dl / avgdl) */
@ -299,6 +301,7 @@ public class BM25Similarity extends Similarity {
@Override @Override
public void normalize(float queryNorm, float topLevelBoost) { public void normalize(float queryNorm, float topLevelBoost) {
// we don't normalize with queryNorm at all, we just capture the top-level boost // we don't normalize with queryNorm at all, we just capture the top-level boost
this.topLevelBoost = topLevelBoost;
this.weight = idf.getValue() * queryBoost * topLevelBoost; this.weight = idf.getValue() * queryBoost * topLevelBoost;
} }
} }
@ -307,8 +310,8 @@ public class BM25Similarity extends Similarity {
Explanation result = new Explanation(); Explanation result = new Explanation();
result.setDescription("score(doc="+doc+",freq="+freq+"), product of:"); result.setDescription("score(doc="+doc+",freq="+freq+"), product of:");
Explanation boostExpl = new Explanation(stats.queryBoost, "boost"); Explanation boostExpl = new Explanation(stats.queryBoost * stats.topLevelBoost, "boost");
if (stats.queryBoost != 1.0f) if (boostExpl.getValue() != 1.0f)
result.addDetail(boostExpl); result.addDetail(boostExpl);
result.addDetail(stats.idf); result.addDetail(stats.idf);