Class VectorStoreRetrieverMemory

Class for managing long-term memory in Large Language Model (LLM) applications. It provides a way to persist and retrieve relevant documents from a vector store database, which can be useful for maintaining conversation history or other types of memory in an LLM application.

Example

const vectorStore = new MemoryVectorStore(new OpenAIEmbeddings());
const memory = new VectorStoreRetrieverMemory({
  vectorStoreRetriever: vectorStore.asRetriever(1),
  memoryKey: "history",
});

// Saving context to memory
await memory.saveContext(
  { input: "My favorite food is pizza" },
  { output: "thats good to know" },
);
await memory.saveContext(
  { input: "My favorite sport is soccer" },
  { output: "..." },
);
await memory.saveContext({ input: "I don't the Celtics" }, { output: "ok" });

// Loading memory variables
console.log(
  await memory.loadMemoryVariables({ prompt: "what sport should i watch?" }),
);

Hierarchy (view full)

Implements

Constructors

constructor

Properties

memoryKey returnDocs vectorStoreRetriever inputKey? metadata?

Accessors

memoryKeys

Methods

loadMemoryVariables saveContext

Constructors

constructor

Properties

memoryKey

memoryKey: string

returnDocs

returnDocs: boolean

vectorStoreRetriever

vectorStoreRetriever: VectorStoreRetrieverInterface

OptionalinputKey

inputKey?: string

Optionalmetadata

metadata?: Metadata | MetadataFunction

Metadata to be added to the document when saving context.

Accessors

memoryKeys

Methods

loadMemoryVariables

  • loadMemoryVariables(values): Promise<MemoryVariables>

  • Method to load memory variables. It uses the vectorStoreRetriever to get relevant documents based on the query obtained from the input values.

    Parameters

    • values: InputValues

      An InputValues object.

    Returns Promise<MemoryVariables>

    A Promise that resolves to a MemoryVariables object.

saveContext

  • saveContext(inputValues, outputValues): Promise<void>

  • Method to save context. It constructs a document from the input and output values (excluding the memory key) and adds it to the vector store database using the vectorStoreRetriever.

    Parameters

    • inputValues: InputValues

      An InputValues object.

    • outputValues: OutputValues

      An OutputValues object.

    Returns Promise<void>

    A Promise that resolves to void.

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