LUCENE-10063: Fix score calculation in SimpleTextKnnVectorsFormat

The method VectorSimilarityFunction#convertToScore already reverses the similarity, so we shouldn't reverse it again.
apache · Nov 11, 2021 · 2a9adb8 · 2a9adb8
1 parent f725b27
commit 2a9adb8
Showing 1 changed file with 0 additions and 3 deletions.
diff --git a/lucene/codecs/src/java/org/apache/lucene/codecs/simpletext/SimpleTextKnnVectorsReader.java b/lucene/codecs/src/java/org/apache/lucene/codecs/simpletext/SimpleTextKnnVectorsReader.java
@@ -160,9 +160,6 @@ public TopDocs search(String field, float[] target, int k, Bits acceptDocs) thro
       }
       float[] vector = values.vectorValue();
       float score = vectorSimilarity.convertToScore(vectorSimilarity.compare(vector, target));
-      if (vectorSimilarity.reversed) {
-        score = 1 / (score + 1);
-      }
       topK.insertWithOverflow(new ScoreDoc(doc, score));
     }
     ScoreDoc[] topScoreDocs = new ScoreDoc[topK.size()];