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MongoDB Vector Search

在本指南中,您可以学习;了解如何使用Java Reactive Streams驾驶员中的MongoDB Vector Search功能。Aggregates 构建者类提供了可用于创建vectorSearch() $vectorSearch管道阶段的 辅助方法。此管道阶段允许您对文档执行语义搜索。语义搜索是一种搜索,可查找与您提供的搜索术语或短语含义相似但不一定相同的信息。

重要

功能兼容性

MongoDB Vector Search 支持在运行MongoDB v6.0.11 、v 或更高版本的Atlas集群上进行近似最近邻7.0.2 (ANN)搜索,并在运行MongoDB v6.0.16 、v 的集群上支持精确最近邻 (ENN)搜索。.7 01073、v..2 或更高版本。您还可以将MongoDB Vector Search 与使用Atlas CLI创建的自管理或本地Atlas部署结合使用。

本指南中的示例使用来自 Atlas 示例数据集sample_mflix 数据库中的 embedded_movies 集合。要学习;了解如何创建免费的MongoDB Atlas 群集并加载示例数据集,请参阅入门教程。

要运行向量搜索查询,您必须创建向量搜索索引并为向量嵌入索引。要学习;了解如何以编程方式创建向量搜索索引,请参阅索引指南中的MongoDB搜索索引管理部分。要学习;了解有关向量嵌入的更多信息,请参阅Atlas文档中的如何为向量搜索编制向量嵌入索引。

在向量嵌入上创建向量搜索索引后,您可以在管道阶段引用此索引,如下节所示。

此示例构建了一个执行以下操作的聚合管道:

  • plot_embedding字段运行 ENN搜索

  • 将结果限制为 1文档

  • 匹配 year 值大于或等于 2016 的文档

  • 将向量搜索分数投影到字段 vectorSearchScore

// Create an instance of the BinaryVector class as the query vector
float[] rawVector = new float[]{ -0.0016261312f, -0.028070757f, -0.011342932f, -0.012775794f, -0.0027440966f, 0.008683807f, -0.02575152f, -0.02020668f, -0.010283281f, -0.0041719596f, 0.021392956f, 0.028657231f, -0.006634482f, 0.007490867f, 0.018593878f, 0.0038187427f, 0.029590257f, -0.01451522f, 0.016061379f, 0.00008528442f, -0.008943722f, 0.01627464f, 0.024311995f, -0.025911469f, 0.00022596726f, -0.008863748f, 0.008823762f, -0.034921836f, 0.007910728f, -0.01515501f, 0.035801545f, -0.0035688248f, -0.020299982f, -0.03145631f, -0.032256044f, -0.028763862f, -0.0071576433f, -0.012769129f, 0.012322609f, -0.006621153f, 0.010583182f, 0.024085402f, -0.001623632f, 0.007864078f, -0.021406285f, 0.002554159f, 0.012229307f, -0.011762793f, 0.0051682983f, 0.0048484034f, 0.018087378f, 0.024325324f, -0.037694257f, -0.026537929f, -0.008803768f, -0.017767483f, -0.012642504f, -0.0062712682f, 0.0009771782f, -0.010409906f, 0.017754154f, -0.004671795f, -0.030469967f, 0.008477209f, -0.005218282f, 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BinaryVector queryVector = BinaryVector.floatVector(rawVector);
// Specify the index name for the vector embedding index
String indexName = "vector_index";
// Specify the path of the field to search on
FieldSearchPath fieldSearchPath = SearchPath.fieldPath("plot_embedding");
// Limit the number of matches to 1
long limit = 1;
// Create a pre-filter to only search within a subset of documents
VectorSearchOptions options = VectorSearchOptions.exactVectorSearchOptions()
.filter(Filters.gte("year", 2016));
// Create the vectorSearch pipeline stage
Publisher<Document> publisher = collection.aggregate(
Arrays.asList(
Aggregates.vectorSearch(
fieldSearchPath,
queryVector,
indexName,
limit,
options),
Aggregates.project(
Projections.metaVectorSearchScore("vectorSearchScore"))
)
);

提示

查询向量类型

前面的示例创建了一个 BinaryVector实例提供服务查询向量,但您也可以创建 Double 实例的 List。 但是,我们建议您使用 BinaryVector 类型以提高存储效率。

以下示例展示了如何运行聚合并从上述聚合管道的结果中打印向量搜索分数:

Document found = Flux.from(publisher).blockFirst();
if (found != null) {
double score = found.getDouble("vectorSearchScore");
System.out.println("vectorSearch score: " + score);
}
vectorSearch score: 0.8821365833282471

要进一步了解本指南所提及的方法和类型,请参阅以下 API 文档: