diff --git a/examples/mongovector-vectorstore-example/README.md b/examples/mongovector-vectorstore-example/README.md new file mode 100644 index 000000000..d26aef370 --- /dev/null +++ b/examples/mongovector-vectorstore-example/README.md @@ -0,0 +1,40 @@ +# Using MongoDB Atlas as a Vector Store with OpenAI Embeddings + +This project illustrates how to leverage MongoDB as a vector store for performing similarity searches, utilizing OpenAI embeddings within a Go application. It integrates the LangChainGo library, OpenAI's API, and MongoDB to create an efficient vector database for semantic search. + + +For more information on getting started with MongoDB Atlas, visit the [MongoDB Atlas Getting Started Guide](https://www.mongodb.com/products/platform/atlas-database). You can also use the following Docker image to containerize a free (M0) tier: [MongoDB Atlas Local](https://hub.docker.com/r/mongodb/mongodb-atlas-local). + +## What This Tutorial Covers + +1. **MongoDB Setup:** + - Connects to a MongoDB Atlas instance using a specified connection string. + - Automatically checks for and creates a vector search index on the collection if it is not already present, ensuring compatibility with OpenAI's embedding model. + +2. **OpenAI Embeddings Initialization:** + - Establishes an embeddings client through the OpenAI API. + - Requires the OpenAI API key to be set as an environment variable for authentication. + +3. **Creating the Vector Store:** + - Connects to the MongoDB database and sets up a vector store that utilizes OpenAI embeddings for document representation. + +4. **Inserting Sample Data:** + - Adds a collection of documents (cities) along with their metadata into the vector store. + - Each document contains information such as the city name, population, and area. + +5. **Executing Similarity Searches:** + - Demonstrates various types of similarity searches, including: + a. A basic search for documents related to "japan". + b. A search for cities in South America that meet a specified score threshold. + c. A search that combines score thresholds with metadata filtering. + +## Running the Example + +1. Configure your environment by setting the MongoDB URI and OpenAI API key: + ```bash + export MONGODB_URI= + export OPENAI_API_KEY= + +2. If you want to run this using docker-compose.yml, `MONGODB_URI` should be `localhost:27017`: `docker-compose up -d` + +3. Run the program: `go run main.go` diff --git a/examples/mongovector-vectorstore-example/docker-compose.yml b/examples/mongovector-vectorstore-example/docker-compose.yml new file mode 100644 index 000000000..4cf39afca --- /dev/null +++ b/examples/mongovector-vectorstore-example/docker-compose.yml @@ -0,0 +1,19 @@ +version: '3.8' + +services: + mongodb-atlas-local: + image: mongodb/mongodb-atlas-local:latest + container_name: mongodb-atlas-local + ports: + - "27017:27017" + environment: + DO_NOT_TRACK: 1 # Set to 1 to opt out of telemetry + volumes: + - ./init-scripts:/docker-entrypoint-initdb.d # Directory for initialization scripts + - ./logs:/var/log/mongodb # Directory for logs (optional) + logging: + driver: "json-file" + options: + max-size: "10m" + max-file: "3" + diff --git a/examples/mongovector-vectorstore-example/go.mod b/examples/mongovector-vectorstore-example/go.mod new file mode 100644 index 000000000..ecfebcf5b --- /dev/null +++ b/examples/mongovector-vectorstore-example/go.mod @@ -0,0 +1,23 @@ +module github.com/tmc/langchaingo/examples/mongovector-vectorstore-example + +go 1.23.1 + +require ( + github.com/tmc/langchaingo v0.1.13-pre.0 + go.mongodb.org/mongo-driver/v2 v2.0.0-beta1 +) + +require ( + github.com/dlclark/regexp2 v1.10.0 // indirect + github.com/golang/snappy v0.0.4 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/klauspost/compress v1.17.6 // indirect + github.com/pkoukk/tiktoken-go v0.1.6 // indirect + github.com/xdg-go/pbkdf2 v1.0.0 // indirect + github.com/xdg-go/scram v1.1.2 // indirect + github.com/xdg-go/stringprep v1.0.4 // indirect + github.com/youmark/pkcs8 v0.0.0-20181117223130-1be2e3e5546d // indirect + golang.org/x/crypto v0.23.0 // indirect + golang.org/x/sync v0.7.0 // indirect + golang.org/x/text v0.15.0 // indirect +) diff --git a/examples/mongovector-vectorstore-example/go.sum b/examples/mongovector-vectorstore-example/go.sum new file mode 100644 index 000000000..09c036566 --- /dev/null +++ b/examples/mongovector-vectorstore-example/go.sum @@ -0,0 +1,128 @@ +cloud.google.com/go v0.114.0 h1:OIPFAdfrFDFO2ve2U7r/H5SwSbBzEdrBdE7xkgwc+kY= +cloud.google.com/go v0.114.0/go.mod h1:ZV9La5YYxctro1HTPug5lXH/GefROyW8PPD4T8n9J8E= +cloud.google.com/go/aiplatform v1.68.0 h1:EPPqgHDJpBZKRvv+OsB3cr0jYz3EL2pZ+802rBPcG8U= +cloud.google.com/go/aiplatform v1.68.0/go.mod h1:105MFA3svHjC3Oazl7yjXAmIR89LKhRAeNdnDKJczME= +cloud.google.com/go/auth v0.5.1 h1:0QNO7VThG54LUzKiQxv8C6x1YX7lUrzlAa1nVLF8CIw= +cloud.google.com/go/auth v0.5.1/go.mod h1:vbZT8GjzDf3AVqCcQmqeeM32U9HBFc32vVVAbwDsa6s= +cloud.google.com/go/auth/oauth2adapt v0.2.2 h1:+TTV8aXpjeChS9M+aTtN/TjdQnzJvmzKFt//oWu7HX4= +cloud.google.com/go/auth/oauth2adapt v0.2.2/go.mod h1:wcYjgpZI9+Yu7LyYBg4pqSiaRkfEK3GQcpb7C/uyF1Q= +cloud.google.com/go/compute/metadata v0.3.0 h1:Tz+eQXMEqDIKRsmY3cHTL6FVaynIjX2QxYC4trgAKZc= +cloud.google.com/go/compute/metadata v0.3.0/go.mod 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h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +sigs.k8s.io/yaml v1.3.0 h1:a2VclLzOGrwOHDiV8EfBGhvjHvP46CtW5j6POvhYGGo= +sigs.k8s.io/yaml v1.3.0/go.mod h1:GeOyir5tyXNByN85N/dRIT9es5UQNerPYEKK56eTBm8= diff --git a/examples/mongovector-vectorstore-example/mongovector_vectorstore_example.go b/examples/mongovector-vectorstore-example/mongovector_vectorstore_example.go new file mode 100644 index 000000000..dbf3af67e --- /dev/null +++ b/examples/mongovector-vectorstore-example/mongovector_vectorstore_example.go @@ -0,0 +1,242 @@ +package main + +import ( + "context" + "fmt" + "log" + "os" + "time" + + "github.com/tmc/langchaingo/embeddings" + "github.com/tmc/langchaingo/llms/openai" + "github.com/tmc/langchaingo/schema" + "github.com/tmc/langchaingo/vectorstores" + "github.com/tmc/langchaingo/vectorstores/mongovector" + "go.mongodb.org/mongo-driver/v2/bson" + "go.mongodb.org/mongo-driver/v2/mongo" + "go.mongodb.org/mongo-driver/v2/mongo/options" +) + +func main() { + const ( + openAIEmbeddingModel = "text-embedding-3-small" + openAIEmbeddingDim = 1536 + similarityAlgorithm = "dotProduct" + indexDP1536 = "vector_index_dotProduct_1536" + databaseName = "langchaingo-test" + collectionName = "vstore" + ) + + if os.Getenv("OPENAI_API_KEY") == "" { + log.Fatalf("OPENAI_API_KEY required for this tutorial") + } + + // First create a client and ensure that a vector search index that supports + // OpenAI's embedding model exists on the example collection. + uri := os.Getenv("MONGODB_URI") + if uri == "" { + log.Fatal("MONGODB_URI required and must point to an MongoDB Atlas Database") + } + + client, err := mongo.Connect(options.Client().ApplyURI(uri)) + if err != nil { + log.Fatalf("failed to connect to server: %w", err) + } + + defer func() { + if err := client.Disconnect(context.Background()); err != nil { + log.Fatalf("error disconnecting the client: %v", err) + } + }() + + coll := client.Database(databaseName).Collection(collectionName) + + if ok, _ := searchIndexExists(context.Background(), coll, indexDP1536); !ok { + fields := []vectorField{} + + fields = append(fields, vectorField{ + Type: "vector", + Path: "plot_embedding", // Default path + NumDimensions: openAIEmbeddingDim, + Similarity: similarityAlgorithm, + }) + + _, err = createVectorSearchIndex(context.Background(), coll, indexDP1536, fields...) + if err != nil { + log.Fatalf("faield to create index: %v", err) + } + } + + // Create an embeddings client using the OpenAI API. Requires environment + // variable OPENAI_API_KEY to be set. + llm, err := openai.New(openai.WithEmbeddingModel(openAIEmbeddingModel)) + if err != nil { + log.Fatalf("failed to create an embedings client: %v", err) + } + + embedder, err := embeddings.NewEmbedder(llm) + if err != nil { + log.Fatal("failed to create an embedder: %v", err) + } + + // A Store is a wrapper for mongo.Collection, since adding and searching + // vectors is collection-specific. + store := mongovector.New(coll, embedder, mongovector.WithIndex(indexDP1536)) + + // Add documents to the MongoDB Atlas Database vector store. + _, err = store.AddDocuments(context.Background(), []schema.Document{ + { + PageContent: "Tokyo", + Metadata: map[string]any{ + "population": 38, + "area": 2190, + }, + }, + { + PageContent: "Paris", + Metadata: map[string]any{ + "population": 11, + "area": 105, + }, + }, + { + PageContent: "London", + Metadata: map[string]any{ + "population": 9.5, + "area": 1572, + }, + }, + { + PageContent: "Santiago", + Metadata: map[string]any{ + "population": 6.9, + "area": 641, + }, + }, + { + PageContent: "Buenos Aires", + Metadata: map[string]any{ + "population": 15.5, + "area": 203, + }, + }, + { + PageContent: "Rio de Janeiro", + Metadata: map[string]any{ + "population": 13.7, + "area": 1200, + }, + }, + { + PageContent: "Sao Paulo", + Metadata: map[string]any{ + "population": 22.6, + "area": 1523, + }, + }, + }) + if err != nil { + log.Fatal("error adding documents: %v", err) + } + + // Search for similar documents. + docs, err := store.SimilaritySearch(context.Background(), "japan", 1) + fmt.Println(docs) + + // Search for similar documents using score threshold. + docs, err = store.SimilaritySearch(context.Background(), "only cities in south america", 10, + vectorstores.WithScoreThreshold(0.80)) + fmt.Println(docs) + + // Search for similar documents using score threshold and metadata filter. + filter := map[string]interface{}{ + "$and": []map[string]interface{}{ + { + "area": map[string]interface{}{ + "$gte": 1000, + }, + }, + { + "population": map[string]interface{}{ + "$gte": 15.5, + }, + }, + }, + } + + docs, err = store.SimilaritySearch(context.Background(), "only cities in south america", 10, + vectorstores.WithScoreThreshold(0.80), + vectorstores.WithFilters(filter)) + fmt.Println(docs) +} + +// vectorField defines the fields of an index used for vector search. +type vectorField struct { + Type string `bson:"type,omitempty"` + Path string `bson:"path,omityempty"` + NumDimensions int `bson:"numDimensions,omitempty"` + Similarity string `bson:"similarity,omitempty"` +} + +// createVectorSearchIndex will create a vector search index on the "db.vstore" +// collection named "vector_index" with the provided field. This function blocks +// until the index has been created. +func createVectorSearchIndex( + ctx context.Context, + coll *mongo.Collection, + idxName string, + fields ...vectorField, +) (string, error) { + def := struct { + Fields []vectorField `bson:"fields"` + }{ + Fields: fields, + } + + view := coll.SearchIndexes() + + siOpts := options.SearchIndexes().SetName(idxName).SetType("vectorSearch") + searchName, err := view.CreateOne(ctx, mongo.SearchIndexModel{Definition: def, Options: siOpts}) + if err != nil { + return "", fmt.Errorf("failed to create the search index: %w", err) + } + + // Await the creation of the index. + var doc bson.Raw + for doc == nil { + cursor, err := view.List(ctx, options.SearchIndexes().SetName(searchName)) + if err != nil { + return "", fmt.Errorf("failed to list search indexes: %w", err) + } + + if !cursor.Next(ctx) { + break + } + + name := cursor.Current.Lookup("name").StringValue() + queryable := cursor.Current.Lookup("queryable").Boolean() + if name == searchName && queryable { + doc = cursor.Current + } else { + time.Sleep(5 * time.Second) + } + } + + return searchName, nil +} + +// Check if the search index exists. +func searchIndexExists(ctx context.Context, coll *mongo.Collection, idx string) (bool, error) { + view := coll.SearchIndexes() + + siOpts := options.SearchIndexes().SetName(idx).SetType("vectorSearch") + cursor, err := view.List(ctx, siOpts) + if err != nil { + return false, fmt.Errorf("failed to list search indexes: %w", err) + } + + name := cursor.Current.Lookup("name").StringValue() + queryable := cursor.Current.Lookup("queryable").Boolean() + + return name == idx && queryable, nil +} diff --git a/vectorstores/mongovector/README.md b/vectorstores/mongovector/README.md new file mode 100644 index 000000000..ca1a3496d --- /dev/null +++ b/vectorstores/mongovector/README.md @@ -0,0 +1,26 @@ +# MongoVector: MongoDB Vector Store for Embeddings + +`mongovector` provide a way for users to read and write to a [MongoDB Atlas Database](https://www.mongodb.com/products/platform/atlas-database) as a vector store using the [MongoDB Go Driver](https://github.com/mongodb/mongo-go-driver) and a supported embedding service. + +## Project Goals +The goal of this project is to enable users to interact with an Atlas cluster as a vector database. The `mongovector` package is designed to meet the following requirements: +- **Embedding-Agnostic**: The package allows users to embed data using various services, including OpenAI, Ollama, Mistral, and others. +- **VectorStore Interface Implementation**: The package implements the `VectorStore` interface, providing methods to add documents and perform similarity searches. + +## Features + +- **Document Storage**: Easily add documents to the MongoDB vector store with their embeddings. +- **Similarity Search**: Perform similarity searches based on user-defined queries and retrieve relevant documents. +- **Customizable Options**: Configure various options for embedding and searching, including score thresholds and filters. + +## Installation + +To use the `mongovector` package, ensure you have Go installed on your machine. You can then install the package using the following command: + +```bash +go get github.com/tmc/langchaingo/vectorstores/mongovector@v0.1.13-pre.0 +``` + +## Docker + +You can also use the following Docker image to containerize a free (M0) tier: [MongoDB Atlas Local](https://hub.docker.com/r/mongodb/mongodb-atlas-local).