zep
Zep | The Memory Foundation For Your AI Stack
Stars: 2446
Zep is a long-term memory service for AI Assistant apps. With Zep, you can provide AI assistants with the ability to recall past conversations, no matter how distant, while also reducing hallucinations, latency, and cost. Zep persists and recalls chat histories, and automatically generates summaries and other artifacts from these chat histories. It also embeds messages and summaries, enabling you to search Zep for relevant context from past conversations. Zep does all of this asyncronously, ensuring these operations don't impact your user's chat experience. Data is persisted to database, allowing you to scale out when growth demands. Zep also provides a simple, easy to use abstraction for document vector search called Document Collections. This is designed to complement Zep's core memory features, but is not designed to be a general purpose vector database. Zep allows you to be more intentional about constructing your prompt: 1. automatically adding a few recent messages, with the number customized for your app; 2. a summary of recent conversations prior to the messages above; 3. and/or contextually relevant summaries or messages surfaced from the entire chat session. 4. and/or relevant Business data from Zep Document Collections.
README:
Quick Start | Documentation | Zep Cloud Docs
Zep continually learns from user interactions, improving your AI agent's knowledge over time. With Zep, you can personalize user experiences and significantly improve agent accuracy.
Zep is powered by a temporal Knowledge Graph. As your user's conversation with an agent progresses, new facts are added to the graph. Zep maintains historical context, helping your agent reason with state change and offering data provenance insights.
Retrieving facts is simple and very fast. Both semantic and graph search are used to ensure facts are relevant to the current conversation. Fact retrieval does not require LLM inference; the slowest activity is embedding the search query.
Zep supports:
- Adding chat history messages.
- Ingestion of JSON and unstructured text.
- Session, user, and group-level graphs. Group graphs allow for capturing organizational knowledge.
Please see the Zep Quick Start Guide for important configuration information.
./zep pull
./zep up[!NOTE] Make sure to set the
secretvalue in thezep.yamlconfiguration file.Additionally, make sure that you expose an
OPENAI_API_KEYenvironment variable either in a local .env file or by runningexport OPENAI_API_KEY=your_openai_api_key
pip install zep-pythonor
npm i @getzep/zep-jsPersisting chat history memory is simple and fast.
result = await client.memory.add(session_id, messages=messages)Zep's high-level memory API offers an opinionated retrieval API, which uses BM25, semantic, and graph search to retrieve facts relevant to the current conversation. Results are reranked by distance from the user node, further improving relevance.
memory = client.memory.get(session_id="session_id")Lower-level APIs for search and CRUD are also available.
A Knowledge Graph is a network of interconnected facts, such as “Kendra loves Adidas shoes.” Each fact is a “triplet” represented by two entities, or nodes (”Kendra”, “Adidas shoes”), and their relationship, or edge (”loves”).
Knowledge Graphs allow us to model an agent's complex world and offer a superior retrieval approach than semantic search alone, which is commonly used in RAG. Most approaches to building Knowledge Graphs don't reason well with state changes. Facts inevitably change over time as users provide new information or business data changes.
Most graph-building tools don't reason well with state changes. Zep incorporates a temporal Knowledge Graph library, Graphiti, which we developed to address this challenge. What makes Graphiti unique is its ability to autonomously build a Knowledge Graph while handling changing relationships and maintaining historical context.
Graphiti also offers Zep the ability to ingest chat history, JSON business data, and unstructured text.
Zep is framework agnostic. It can be used with LangChain, LangGraph, Chainlit, Microsoft Autogen, and more.
Zep Community Edition is an open-source Zep distribution. It shares APIs with Zep Cloud and has comprehensive documentation available.
Zep Cloud is a managed service with Zep Community Edition at its core. In addition to Zep Community Edition's memory layer, Zep Cloud offers:
- Low Latency, Scalability, High Availability: Our cloud is designed to scale to the needs of customers with millions of DAUs and is SOC II Type 2 certified. Zep utilizes self-hosted LLMs and embedding models, offering customers very low-latency memory retrieval and graph-building.
- Dialog Classification: Instantly and accurately classify chat dialog. Understand user intent and emotion, segment users, and more. Route chains based on semantic context, and trigger events.
- Structured Data Extraction: Quickly extract business data from chat conversations using a schema you define. Understand what your assistant should ask for next to complete the task.
With increased LLM context lengths, including the entire chat history, RAG results, and other instructions in a prompt may be tempting. Unfortunately, this has resulted in poor temporal reasoning, poor recall, hallucinations, and slow and expensive inference.
As discussed above, providing just the chat history to an LLM can often result in poor temporal reasoning.
Users, Sessions, and Chat Messages are first-class abstractions in Zep. This allows simple and flexible management of chat memory, including the execution of Right To Be Forgetten requests and other privacy compliance-related tasks with single-API call.
Yes - Zep offers Python & TypeScript/JS SDKs for easy integration with your Assistant app. We also have examples of using Zep with popular frameworks - see below.
Yes - the Zep team and community contributors have built integrations with Zep, making it simple to, for example, drop Zep's memory components into a LangChain app. Please see the Zep Documentation and your favorite framework's documentation.
Zep Community Edition relies on an external LLM API service to function. Any OpenAI-compatible LLM API is supported. Providers such as Anthropic can be used via a proxy such as LiteLLM. You will also need to configure LiteLLM with an embedding service.
import uuid
from zep_python.client import AsyncZep
from zep_python.types import Message
client = AsyncZep(
api_key=API_KEY,
base_url=BASE_URL,
)
user_id = uuid.uuid4().hex # A new user identifier
new_user = await client.user.add(
user_id=user_id,
email="[email protected]",
first_name="Jane",
last_name="Smith",
metadata={"foo": "bar"},
)
# create a chat session
session_id = uuid.uuid4().hex # A new session identifier
session = await client.memory.add_session(
session_id=session_id,
user_id=user_id,
metadata={"foo" : "bar"}
)
# Add a memory to the session
await client.memory.add_memory(
session_id=session_id,
messages=[
Message(
role_type = "user", # One of ("system", "assistant", "user", "function", "tool")
role = "Researcher", # Optional, a use case specific string representing the role of the user
content = "Who was Octavia Butler?", # The message content
)
],
)
# Get session memory
memory = await client.memory.get(session_id=session_id)
messages = memory.messages # List of messages in the session (quantity determined by optional lastn parameter in memory.get)
relevant_facts = memory.relevant_facts # List of facts relevant to the recent messages in the session
# Search user facts across all sessions
search_response = await client.memory.search_sessions(
user_id=user_id,
search_scope="facts",
text="What science fiction books did I recently read?",
)
facts = [r.fact for r in search_response.results]import { v4 as uuidv4 } from 'uuid';
import { ZepClient } from '@getzep/zep-js';
import type { CreateUserRequest, CreateSessionRequest, SessionSearchQuery } from '@getzep/zep-js/api';
const client = new ZepClient({
apiKey: API_KEY,
baseUrl: BASE_URL,
});
// A new user identifier
const userId = uuidv4();
const userRequest: CreateUserRequest = {
userId: userId,
email: "[email protected]",
firstName: "Jane",
lastName: "Smith",
metadata: { foo: "bar" },
};
const newUser = await client.user.add(userRequest);
// Create a chat session
const sessionId = uuidv4();
const sessionRequest: CreateSessionRequest = {
sessionId: sessionId,
userId: userId,
metadata: { foo: "bar" },
};
// A new session identifier
const session = await client.memory.addSession(sessionRequest);
// Add a memory to the session
await client.memory.add(sessionId, {
messages: [
{
role: "Researcher",
roleType: "user",
content: "Who was Octavia Butler?",
},
],
});
// Get session memory
const memory = await client.memory.get(sessionId);
const messages = memory.messages; // List of messages in the session (quantity determined by optional lastN parameter in memory.get)
const relevantFacts = memory.relevantFacts; // List of facts relevant to the recent messages in the session
// Search user facts across all sessions
const searchQuery: SessionSearchQuery = {
userId: userId,
searchScope: "facts",
text: "What science fiction books did I recently read?",
};
const searchResponse = await client.memory.searchSessions(searchQuery);
const facts = searchResponse.results?.map(result => result.fact);Zep Open Source is an older version of Zep that did not use a Knowledge Graph to persist and recall memory.
Some additional changes:
- The Zep OSS web UI has been deprecated in favor of significantly expanded SDK support.
- Zep CE supports many LLM services and local servers that offer OpenAI-compatible APIs. Other services may be used with an LLM proxy.
- Zep CE no longer ships with a local embedding service and named entity extractor.
Significant changes have been made to Zep, and unfortunately, we have not been able to devise a migration path from Zep OSS to Zep CE.
Zep OSS will remain available in our container repo, but we will not see future enhancements or bug fixes. The code is available in the legacy branch in this repo.
We welcome contributions. For more, see the CONTRIBUTING file in this repo.
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