Overview
En esta guía, aprenderá a realizar búsquedas en sus documentos mediante la función MongoDB Vector Search. El controlador de Rust le permite realizar consultas MongoDB Vector Search mediante el marco de agregación. Para obtener más información sobre cómo realizar agregaciones, consulte Guíade agregación.
Nota
Compatibilidad de implementación
Solo puede usar la función de búsqueda vectorial de MongoDB al conectarse a clústeres de MongoDB Atlas. Esta función no está disponible para implementaciones autogestionadas.
Para obtener más información sobre MongoDB Vector Search, consulte Descripción general de la búsqueda vectorial de MongoDB.
Nota
MongoDB búsqueda
Para realizar búsquedas avanzadas de texto completo en sus documentos, puede usar la función de búsqueda de MongoDB. Para obtener más información sobre esta función, consulte la descripción general de la búsqueda de MongoDB.
Índice de búsqueda vectorial de MongoDB
Antes de poder realizar consultas de búsqueda vectorial de MongoDB, debe crear un índice de búsqueda vectorial de MongoDB en su colección. Para obtener más información sobre cómo crear este índice, consulte la guía de búsquedas de MongoDB e índices de búsqueda vectorial.
Etapa de agregación de búsqueda vectorial de MongoDB
Para crear una $vectorSearch En esta etapa de su canalización de agregación, realice las siguientes acciones:
Crea un vector para almacenar las etapas del pipeline.
Especifique el operador
$vectorSearchy proporcione detalles sobre la consulta de búsqueda vectorial.
Debes definir los siguientes campos en tu etapa $vectorSearch:
Parameter | Tipo | Descripción |
|---|---|---|
| string | Nombre del índice de búsqueda vectorial |
| string | Campo que contiene incrustaciones vectoriales |
| arreglo de números | Representación vectorial de su consulta |
| Número | Número de resultados a retornar |
Ejemplos de consultas de búsqueda vectorial de MongoDB
En esta sección, aprenderá a realizar consultas de búsqueda vectorial de MongoDB. Los ejemplos de esta sección utilizan datos de muestra de la sample_mflix.embedded_movies colección. Para aprender a cargar estos datos de muestra, consulte el tutorial "Cargar datos en Atlas" en la documentación de Atlas.
Consulta básica de búsqueda vectorial de MongoDB
El siguiente código realiza una consulta de búsqueda vectorial de MongoDB en el plot_embedding campo vectorial utilizando un vector de consulta que representa el término viaje en el tiempo:
let query_vector = Vector::Float32(vec![-0.0016261312, -0.028070757, -0.011342932, -0.012775794, -0.0027440966, 0.008683807, -0.02575152, -0.02020668, -0.010283281, -0.0041719596, 0.021392956, 0.028657231, -0.006634482, 0.007490867, 0.018593878, 0.0038187427, 0.029590257, -0.01451522, 0.016061379, 0.00008528442, -0.008943722, 0.01627464, 0.024311995, -0.025911469, 0.00022596726, -0.008863748, 0.008823762, -0.034921836, 0.007910728, -0.01515501, 0.035801545, -0.0035688248, -0.020299982, -0.03145631, -0.032256044, -0.028763862, -0.0071576433, -0.012769129, 0.012322609, -0.006621153, 0.010583182, 0.024085402, -0.001623632, 0.007864078, -0.021406285, 0.002554159, 0.012229307, -0.011762793, 0.0051682983, 0.0048484034, 0.018087378, 0.024325324, -0.037694257, -0.026537929, -0.008803768, -0.017767483, -0.012642504, -0.0062712682, 0.0009771782, -0.010409906, 0.017754154, -0.004671795, -0.030469967, 0.008477209, -0.005218282, -0.0058480743, -0.020153364, -0.0032805866, 0.004248601, 0.0051449724, 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0.02071318, -0.03156294, -0.030869836, -0.006324584, 0.013795458, -0.00047151142, 0.016874444, 0.00947688, 0.00985009, -0.029883493, 0.024205362, -0.013522214, -0.015075036, -0.030603256, 0.029270362, 0.010503208, 0.021539574, 0.01743426, -0.023898797, 0.022019416, -0.0068777353, 0.027857494, -0.021259667, 0.0025758184, 0.006197959, 0.006447877, -0.00025200035, -0.004941706, -0.021246338, -0.005504854, -0.008390571, -0.0097301295, 0.027244363, -0.04446536, 0.05216949, 0.010243294, -0.016008062, 0.0122493, -0.0199401, 0.009077012, 0.019753495, 0.006431216, -0.037960835, -0.027377652, 0.016381273, -0.0038620618, 0.022512587, -0.010996379, -0.0015211658, -0.0102233, 0.007071005, 0.008230623, -0.009490209, -0.010083347, 0.024431955, 0.002427534, 0.02828402, 0.0035721571, -0.022192692, -0.011882754, 0.010056688, 0.0011904413, -0.01426197, -0.017500903, -0.00010985966, 0.005591492, -0.0077707744, -0.012049366, 0.011869425, 0.00858384, -0.024698535, -0.030283362, 0.020140035, 0.011949399, -0.013968734, 0.042732596, -0.011649498, -0.011982721, -0.016967745, -0.0060913274, -0.007130985, -0.013109017, -0.009710136]); let pipeline = vec![ doc! { "$vectorSearch": doc! { "queryVector": &query_vector, "path": "plot_embedding", "numCandidates": 150, "index": "vector_index", "limit": 5 } }, doc! { "$project": doc! { "_id": 0, "title": 1, "plot": 1, } }, ]; let mut results = my_coll.aggregate(pipeline).await?; while let Some(result) = results.try_next().await? { println!("{}", result); }
{ "plot": "A reporter, learning of time travelers visiting 20th century disasters, tries to change the history they know by averting upcoming disasters.", "title": "Thrill Seekers" } { "plot": "At the age of 21, Tim discovers he can travel in time and change what happens and has happened in his own life. His decision to make his world a better place by getting a girlfriend turns out not to be as easy as you might think.", "title": "About Time" } { "plot": "Hoping to alter the events of the past, a 19th century inventor instead travels 800,000 years into the future, where he finds humankind divided into two warring races.", "title": "The Time Machine" } { "plot": "After using his mother's newly built time machine, Dolf gets stuck involuntary in the year 1212. He ends up in a children's crusade where he confronts his new friends with modern techniques...", "title": "Crusade in Jeans" } { "plot": "An officer for a security agency that regulates time travel, must fend for his life against a shady politician who has a tie to his past.", "title": "Timecop" }
Tip
Tipo de vector de consulta
El ejemplo anterior crea una instancia de bson::binary::Vector, introducida en bson v2.14, que sirve como vector de consulta. También puede usar un vec de números como vector de consulta, pero recomendamos usar el tipo Vector para optimizar el almacenamiento.
Puntuación de búsqueda vectorial de MongoDB
El siguiente código realiza la misma consulta que en el ejemplo anterior, pero genera solo el campo title y el metacampo vectorSearchScore, que describe qué tan bien coincide el documento con el vector de consulta:
let pipeline = vec![ doc! { "$vectorSearch": doc! { "queryVector": &query_vector, "path": "plot_embedding", "numCandidates": 150, "index": "vector_index", "limit": 5 } }, doc! { "$project": doc! { "_id": 0, "title": 1, "score": doc! { "$meta": "vectorSearchScore" }, } }, ]; let mut results = my_coll.aggregate(pipeline).await?; while let Some(result) = results.try_next().await? { println!("{}", result); }
{ "title": "Thrill Seekers", "score": 0.9332504272460938 } { "title": "About Time", "score": 0.9312690496444702 } { "title": "The Time Machine", "score": 0.9295310378074646 } { "title": "Crusade in Jeans", "score": 0.9290415048599243 } { "title": "Timecop", "score": 0.9283164739608765 }
Opciones de búsqueda de vectores de MongoDB
Puede utilizar una etapa $vectorSearch para realizar muchos tipos de consultas de Búsqueda Vectorial de MongoDB. Dependiendo de su query deseada, puede especificar las siguientes opciones en la definición de etapa:
Parámetro opcional | Tipo | Descripción | Valor por defecto |
|---|---|---|---|
| booleano | Especifica si se debe ejecutar una búsqueda de vecino más cercano exacto ( |
|
| Documento | Especifica un pre-filtro para los documentos a buscar. | Sin filtrado |
| Número | Especifica el número de vecinos más cercanos a utilizar durante la búsqueda | No limit |
Para obtener más información sobre estas opciones, consulte la sección Campos de la $vectorSearch referencia del operador en la documentación de Atlas.
Información Adicional
Para aprender más sobre los conceptos mencionados en esta guía, consulta las siguientes entradas del manual del servidor:
Para obtener más información sobre el comportamiento del aggregate() método, consulte la sección Operaciones de agregación de la guía Recuperar datos.
Documentación de la API
Para obtener más información sobre los métodos y tipos mencionados en esta guía, consulte la siguiente documentación de API: