diff --git a/examples/pgvector-vectorstore-example/README.md b/examples/pgvector-vectorstore-example/README.md new file mode 100644 index 000000000..75c55bfb9 --- /dev/null +++ b/examples/pgvector-vectorstore-example/README.md @@ -0,0 +1,20 @@ +# pgvector store with OpenAI embeddings + +Start Postgres: + +```shell +docker-compose up -d +``` + +`postgres.Dockerfile` extends the official Postgres image and installs the pgvector extension. + +`create_extension.sql` enables the pgvector extension and should run automatically when the container starts for the +first time. + +Run the example: + +```shell +export OPENAI_API_KEY= +go run pgvector_vectorstore_example.go +``` + diff --git a/examples/pgvector-vectorstore-example/create_extension.sql b/examples/pgvector-vectorstore-example/create_extension.sql new file mode 100644 index 000000000..4e49dea13 --- /dev/null +++ b/examples/pgvector-vectorstore-example/create_extension.sql @@ -0,0 +1 @@ +create extension if not exists vector; diff --git a/examples/pgvector-vectorstore-example/docker-compose.yml b/examples/pgvector-vectorstore-example/docker-compose.yml new file mode 100644 index 000000000..846b5cfca --- /dev/null +++ b/examples/pgvector-vectorstore-example/docker-compose.yml @@ -0,0 +1,12 @@ +version: "3.9" +services: + db: + build: + dockerfile: postgres.Dockerfile + restart: always + ports: + - "5432:5432" + environment: + POSTGRES_PASSWORD: testpass + POSTGRES_USER: testuser + POSTGRES_DB: testdb \ No newline at end of file diff --git a/examples/pgvector-vectorstore-example/go.mod b/examples/pgvector-vectorstore-example/go.mod new file mode 100644 index 000000000..c82847d26 --- /dev/null +++ b/examples/pgvector-vectorstore-example/go.mod @@ -0,0 +1,19 @@ +module github.com/tmc/langchaingo/examples/pgvector-vectorstore-example + +go 1.21 + +toolchain go1.21.4 + +require github.com/tmc/langchaingo v0.1.3 + +require ( + github.com/dlclark/regexp2 v1.8.1 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/jackc/pgpassfile v1.0.0 // indirect + github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect + github.com/jackc/pgx/v5 v5.4.1 // indirect + github.com/pgvector/pgvector-go v0.1.1 // indirect + github.com/pkoukk/tiktoken-go v0.1.2 // indirect + golang.org/x/crypto v0.17.0 // indirect + golang.org/x/text v0.14.0 // indirect +) diff --git a/examples/pgvector-vectorstore-example/go.sum b/examples/pgvector-vectorstore-example/go.sum new file mode 100644 index 000000000..0bace9fff --- /dev/null +++ b/examples/pgvector-vectorstore-example/go.sum @@ -0,0 +1,148 @@ +cloud.google.com/go v0.110.2 h1:sdFPBr6xG9/wkBbfhmUz/JmZC7X6LavQgcrVINrKiVA= +cloud.google.com/go v0.110.2/go.mod h1:k04UEeEtb6ZBRTv3dZz4CeJC3jKGxyhl0sAiVVquxiw= +cloud.google.com/go/aiplatform v1.42.0 h1:otuKi5bgONobl5+3bMSrapkTJGL8zNZqtr7M0tfXbt4= +cloud.google.com/go/aiplatform v1.42.0/go.mod h1:oLLeleZuSemfGDZqyX/Z2PXT5SBItSraRHqgYb2RgcI= +cloud.google.com/go/compute v1.20.1 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+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +mellium.im/sasl v0.3.1 h1:wE0LW6g7U83vhvxjC1IY8DnXM+EU095yeo8XClvCdfo= +mellium.im/sasl v0.3.1/go.mod h1:xm59PUYpZHhgQ9ZqoJ5QaCqzWMi8IeS49dhp6plPCzw= diff --git a/examples/pgvector-vectorstore-example/pgvector_vectorstore_example.go b/examples/pgvector-vectorstore-example/pgvector_vectorstore_example.go new file mode 100644 index 000000000..178e35f11 --- /dev/null +++ b/examples/pgvector-vectorstore-example/pgvector_vectorstore_example.go @@ -0,0 +1,112 @@ +package main + +import ( + "context" + "fmt" + "github.com/tmc/langchaingo/llms/openai" + "github.com/tmc/langchaingo/schema" + "github.com/tmc/langchaingo/vectorstores/pgvector" + "log" + + "github.com/tmc/langchaingo/embeddings" + "github.com/tmc/langchaingo/vectorstores" +) + +func main() { + // Create an embeddings client using the OpenAI API. Requires environment variable OPENAI_API_KEY to be set. + llm, err := openai.New() + if err != nil { + log.Fatal(err) + } + + e, err := embeddings.NewEmbedder(llm) + if err != nil { + log.Fatal(err) + } + + // Create a new pgvector store. + ctx := context.Background() + store, err := pgvector.New( + ctx, + pgvector.WithConnectionURL("postgres://testuser:testpass@localhost:5432/testdb?sslmode=disable"), + pgvector.WithEmbedder(e), + ) + if err != nil { + log.Fatal(err) + } + + //Add documents to the pgvector 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(err) + } + + // Search for similar documents. + docs, err := store.SimilaritySearch(ctx, "japan", 1) + fmt.Println(docs) + + // Search for similar documents using score threshold. + docs, err = store.SimilaritySearch(ctx, "only cities in south america", 10, vectorstores.WithScoreThreshold(0.80)) + fmt.Println(docs) + + // Search for similar documents using score threshold and metadata filter. + // Metadata filter for pgvector only supports key-value pairs for now. + filter := map[string]any{"area": "1523"} // Sao Paulo + + docs, err = store.SimilaritySearch(ctx, "only cities in south america", + 10, + vectorstores.WithScoreThreshold(0.80), + vectorstores.WithFilters(filter), + ) + fmt.Println(docs) +} diff --git a/examples/pgvector-vectorstore-example/postgres.Dockerfile b/examples/pgvector-vectorstore-example/postgres.Dockerfile new file mode 100644 index 000000000..cabf1583d --- /dev/null +++ b/examples/pgvector-vectorstore-example/postgres.Dockerfile @@ -0,0 +1,9 @@ +FROM postgres:16 + +RUN apt-get update && \ + apt-get install -y --no-install-recommends postgresql-16-pgvector && \ + apt-get clean && \ + rm -rf /var/lib/apt/lists/* + +RUN mkdir -p /docker-entrypoint-initdb.d +ADD create_extension.sql /docker-entrypoint-initdb.d \ No newline at end of file