memory#

Memory maintains Chain state, incorporating context from past runs.

Class hierarchy for Memory:

BaseMemory --> BaseChatMemory --> <name>Memory  # Examples: ZepMemory, MotorheadMemory

Main helpers:

BaseChatMessageHistory

Chat Message History stores the chat message history in different stores.

Class hierarchy for ChatMessageHistory:

BaseChatMessageHistory --> <name>ChatMessageHistory  # Example: ZepChatMessageHistory

Main helpers:

AIMessage, BaseMessage, HumanMessage

Classes

memory.buffer.ConversationBufferMemory

Buffer for storing conversation memory.

memory.buffer.ConversationStringBufferMemory

Buffer for storing conversation memory.

memory.buffer_window.ConversationBufferWindowMemory

Buffer for storing conversation memory inside a limited size window.

memory.chat_memory.BaseChatMemory

Abstract base class for chat memory.

memory.combined.CombinedMemory

Combining multiple memories' data together.

memory.entity.BaseEntityStore

Abstract base class for Entity store.

memory.entity.ConversationEntityMemory

Entity extractor & summarizer memory.

memory.entity.InMemoryEntityStore

In-memory Entity store.

memory.entity.RedisEntityStore

Redis-backed Entity store.

memory.entity.SQLiteEntityStore

SQLite-backed Entity store

memory.entity.UpstashRedisEntityStore

Upstash Redis backed Entity store.

memory.readonly.ReadOnlySharedMemory

Memory wrapper that is read-only and cannot be changed.

memory.simple.SimpleMemory

Simple memory for storing context or other information that shouldn't ever change between prompts.

memory.summary.ConversationSummaryMemory

Conversation summarizer to chat memory.

memory.summary_buffer.ConversationSummaryBufferMemory

Buffer with summarizer for storing conversation memory.

memory.token_buffer.ConversationTokenBufferMemory

Conversation chat memory with token limit.

memory.vectorstore.VectorStoreRetrieverMemory

VectorStoreRetriever-backed memory.

memory.vectorstore_token_buffer_memory.ConversationVectorStoreTokenBufferMemory

Conversation chat memory with token limit and vectordb backing.

Functions

memory.utils.get_prompt_input_key(inputs, ...)

Get the prompt input key.

Deprecated classes

memory.summary.SummarizerMixin

Deprecated since version 0.2.12: Refer here for how to incorporate summaries of conversation history: https://langchain-ai.github.io/langgraph/how-tos/memory/add-summary-conversation-history/