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209 changes: 209 additions & 0 deletions
209
server/src/main/java/org/elasticsearch/search/vectors/DenseVectorQuery.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,209 @@ | ||
| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the Elastic License | ||
| * 2.0 and the Server Side Public License, v 1; you may not use this file except | ||
| * in compliance with, at your election, the Elastic License 2.0 or the Server | ||
| * Side Public License, v 1. | ||
| */ | ||
|
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| package org.elasticsearch.search.vectors; | ||
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| import org.apache.lucene.index.ByteVectorValues; | ||
| import org.apache.lucene.index.FloatVectorValues; | ||
| import org.apache.lucene.index.LeafReaderContext; | ||
| import org.apache.lucene.search.DocIdSetIterator; | ||
| import org.apache.lucene.search.Explanation; | ||
| import org.apache.lucene.search.IndexSearcher; | ||
| import org.apache.lucene.search.Query; | ||
| import org.apache.lucene.search.QueryVisitor; | ||
| import org.apache.lucene.search.ScoreMode; | ||
| import org.apache.lucene.search.Scorer; | ||
| import org.apache.lucene.search.VectorScorer; | ||
| import org.apache.lucene.search.Weight; | ||
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| import java.io.IOException; | ||
| import java.util.Arrays; | ||
| import java.util.Objects; | ||
|
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| /** | ||
| * Exact knn query. Will iterate and score all documents that have the provided dense vector field in the index. | ||
| */ | ||
| public abstract class DenseVectorQuery extends Query { | ||
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| protected final String field; | ||
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| public DenseVectorQuery(String field) { | ||
| this.field = field; | ||
| } | ||
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| @Override | ||
| public void visit(QueryVisitor queryVisitor) { | ||
| queryVisitor.visitLeaf(this); | ||
| } | ||
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| abstract static class DenseVectorWeight extends Weight { | ||
| private final String field; | ||
| private final float boost; | ||
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| protected DenseVectorWeight(DenseVectorQuery query, float boost) { | ||
| super(query); | ||
| this.field = query.field; | ||
| this.boost = boost; | ||
| } | ||
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| abstract VectorScorer vectorScorer(LeafReaderContext leafReaderContext) throws IOException; | ||
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| @Override | ||
| public Explanation explain(LeafReaderContext leafReaderContext, int i) throws IOException { | ||
| VectorScorer vectorScorer = vectorScorer(leafReaderContext); | ||
| if (vectorScorer == null) { | ||
| return Explanation.noMatch("No vector values found for field: " + field); | ||
| } | ||
| DocIdSetIterator iterator = vectorScorer.iterator(); | ||
| iterator.advance(i); | ||
| if (iterator.docID() == i) { | ||
| float score = vectorScorer.score(); | ||
| return Explanation.match(vectorScorer.score() * boost, "found vector with calculated similarity: " + score); | ||
| } | ||
| return Explanation.noMatch("Document not found in vector values for field: " + field); | ||
| } | ||
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| @Override | ||
| public Scorer scorer(LeafReaderContext leafReaderContext) throws IOException { | ||
| VectorScorer vectorScorer = vectorScorer(leafReaderContext); | ||
| if (vectorScorer == null) { | ||
| return null; | ||
| } | ||
| return new DenseVectorScorer(this, vectorScorer); | ||
| } | ||
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| @Override | ||
| public boolean isCacheable(LeafReaderContext leafReaderContext) { | ||
| return true; | ||
| } | ||
| } | ||
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| public static class Floats extends DenseVectorQuery { | ||
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| private final float[] query; | ||
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| public Floats(float[] query, String field) { | ||
| super(field); | ||
| this.query = query; | ||
| } | ||
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| public float[] getQuery() { | ||
| return query; | ||
| } | ||
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| @Override | ||
| public String toString(String field) { | ||
| return "DenseVectorQuery.Floats"; | ||
| } | ||
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| @Override | ||
| public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) throws IOException { | ||
| return new DenseVectorWeight(Floats.this, boost) { | ||
| @Override | ||
| VectorScorer vectorScorer(LeafReaderContext leafReaderContext) throws IOException { | ||
| FloatVectorValues vectorValues = leafReaderContext.reader().getFloatVectorValues(field); | ||
| if (vectorValues == null) { | ||
| return null; | ||
| } | ||
| return vectorValues.scorer(query); | ||
| } | ||
| }; | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) return true; | ||
| if (o == null || getClass() != o.getClass()) return false; | ||
| Floats floats = (Floats) o; | ||
| return Objects.equals(field, floats.field) && Objects.deepEquals(query, floats.query); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(field, Arrays.hashCode(query)); | ||
| } | ||
| } | ||
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| public static class Bytes extends DenseVectorQuery { | ||
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| private final byte[] query; | ||
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| public Bytes(byte[] query, String field) { | ||
| super(field); | ||
| this.query = query; | ||
| } | ||
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| @Override | ||
| public String toString(String field) { | ||
| return "DenseVectorQuery.Bytes"; | ||
| } | ||
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| @Override | ||
| public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) throws IOException { | ||
| return new DenseVectorWeight(Bytes.this, boost) { | ||
| @Override | ||
| VectorScorer vectorScorer(LeafReaderContext leafReaderContext) throws IOException { | ||
| ByteVectorValues vectorValues = leafReaderContext.reader().getByteVectorValues(field); | ||
| if (vectorValues == null) { | ||
| return null; | ||
| } | ||
| return vectorValues.scorer(query); | ||
| } | ||
| }; | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) return true; | ||
| if (o == null || getClass() != o.getClass()) return false; | ||
| Bytes bytes = (Bytes) o; | ||
| return Objects.equals(field, bytes.field) && Objects.deepEquals(query, bytes.query); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(field, Arrays.hashCode(query)); | ||
| } | ||
| } | ||
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| static class DenseVectorScorer extends Scorer { | ||
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| private final VectorScorer vectorScorer; | ||
| private final DocIdSetIterator iterator; | ||
| private final float boost; | ||
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| DenseVectorScorer(DenseVectorWeight weight, VectorScorer vectorScorer) { | ||
| super(weight); | ||
| this.vectorScorer = vectorScorer; | ||
| this.iterator = vectorScorer.iterator(); | ||
| this.boost = weight.boost; | ||
| } | ||
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| @Override | ||
| public DocIdSetIterator iterator() { | ||
| return vectorScorer.iterator(); | ||
| } | ||
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| @Override | ||
| public float getMaxScore(int i) throws IOException { | ||
| // TODO: can we optimize this at all? | ||
| return Float.POSITIVE_INFINITY; | ||
| } | ||
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| @Override | ||
| public float score() throws IOException { | ||
| assert iterator.docID() != -1; | ||
| return vectorScorer.score() * boost; | ||
| } | ||
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| @Override | ||
| public int docID() { | ||
| return iterator.docID(); | ||
| } | ||
| } | ||
| } |
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