jtibshirani commented on code in PR #11756: URL: https://github.com/apache/lucene/pull/11756#discussion_r966310331
########## lucene/core/src/java/org/apache/lucene/search/VectorScorer.java: ########## @@ -0,0 +1,104 @@ +/* + * 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 org.apache.lucene.index.FieldInfo; +import org.apache.lucene.index.LeafReaderContext; +import org.apache.lucene.index.VectorSimilarityFunction; +import org.apache.lucene.index.VectorValues; +import org.apache.lucene.util.BytesRef; +import org.apache.lucene.util.VectorUtil; + +/** + * Computes the similarity score between a given query vector and different document vectors. This + * is primarily used by {@link org.apache.lucene.search.KnnVectorQuery} to run an exact, exhaustive + * search over the vectors. + */ +abstract class VectorScorer { + protected final VectorValues values; + + /** + * Create a new vector scorer instance. + * + * @param context the reader context + * @param fi the FieldInfo for the field containing document vectors + * @param query the query vector to compute the similarity for + */ + static VectorScorer create(LeafReaderContext context, FieldInfo fi, float[] query) + throws IOException { + VectorValues values = context.reader().getVectorValues(fi.name); + VectorSimilarityFunction similarity = fi.getVectorSimilarityFunction(); + return switch (fi.getVectorEncoding()) { + case BYTE -> new ByteVectorScorer(values, query, similarity); + case FLOAT32 -> new FloatVectorScorer(values, query, similarity); + }; + } + + VectorScorer(VectorValues values) { + this.values = values; + } + + /** + * Advance the instance to the given document ID and return true if there is a value for that + * document. + */ + public boolean advanceExact(int doc) throws IOException { + int vectorDoc = values.docID(); + if (vectorDoc < doc) { + vectorDoc = values.advance(doc); + } + return vectorDoc == doc; + } + + /** Compute the similarity score for the current document. */ + abstract float score() throws IOException; + + private static class ByteVectorScorer extends VectorScorer { + private final BytesRef query; + private final VectorSimilarityFunction similarity; Review Comment: 👍 -- 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
