dungba88 commented on code in PR #14009: URL: https://github.com/apache/lucene/pull/14009#discussion_r2103857961
########## lucene/core/src/java/org/apache/lucene/search/RerankFloatVectorQuery.java: ########## @@ -0,0 +1,116 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.lucene.search; + +import java.io.IOException; +import java.util.Arrays; +import java.util.Objects; +import org.apache.lucene.index.FieldInfo; +import org.apache.lucene.index.FloatVectorValues; +import org.apache.lucene.index.IndexReader; +import org.apache.lucene.index.VectorSimilarityFunction; + +/** + * A wrapper of Query which does full-precision reranking based on a vector field. + * + * @lucene.experimental + */ +public class RerankFloatVectorQuery extends Query { + + private final int k; + private final float[] target; + private final Query query; + private final String field; + + /** + * Execute the inner Query and re-rank using full-precision vectors + * + * @param query the query to execute as initial phase + * @param field the vector field to use for re-ranking + * @param target the target of the search + * @param k the number of documents to find + * @throws IllegalArgumentException if <code>k</code> is less than 1 + */ + public RerankFloatVectorQuery(Query query, String field, float[] target, int k) { + this.query = query; + this.field = field; + this.target = target; + this.k = k; + } + + @Override + public Query rewrite(IndexSearcher indexSearcher) throws IOException { + IndexReader reader = indexSearcher.getIndexReader(); + Query rewritten = indexSearcher.rewrite(query); + Weight weight = indexSearcher.createWeight(rewritten, ScoreMode.COMPLETE_NO_SCORES, 1.0f); + HitQueue queue = new HitQueue(k, false); + for (var leaf : reader.leaves()) { + Scorer scorer = weight.scorer(leaf); + if (scorer == null) { + continue; + } + FloatVectorValues floatVectorValues = leaf.reader().getFloatVectorValues(field); + if (floatVectorValues == null) { + continue; + } + FieldInfo fi = leaf.reader().getFieldInfos().fieldInfo(field); + if (fi == null) { + continue; + } + VectorSimilarityFunction comparer = fi.getVectorSimilarityFunction(); + DocIdSetIterator iterator = scorer.iterator(); + while (iterator.nextDoc() != DocIdSetIterator.NO_MORE_DOCS) { + int docId = iterator.docID(); + float[] vectorValue = floatVectorValues.vectorValue(docId); Review Comment: Thanks for the pointer. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org
