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Memory chatbot

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The Chat memory component is also known as the Message history component.

This flow extends the basic prompting flow with a Message history component that stores previous chat messages and uses them to provide context for the current conversation.

Prerequisites​

Create the memory chatbot flow​

  1. From the Langflow dashboard, click New Flow.
  2. Select Memory Chatbot.
  3. The Memory Chatbot flow is created.

Memory chatbot flow

This flow adds a Message history component to the Basic Prompting flow. This component retrieves previous messages and sends them to the Prompt component to fill a part of the Template with context.

To examine the template, click the Template field in the Prompt component. The Prompt instructs the Language model component how to respond to input.


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You are a helpful assistant that answers questions.
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Use markdown to format your answer, properly embedding images and urls.
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History:
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{memory}

The {memory} code in the prompt creates a new input port in the component called memory. The Message history component is connected to this port to store chat messages from the Playground, and provide the Language model component with a memory of previous chat messages.

Run the memory chatbot flow​

  1. Open the Playground.
  2. Enter multiple questions. For example, try entering this conversation:

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Hi, my name is Luca.
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Please tell me about PostgreSQL.
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What is my name?
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What is the second subject I asked you about?

The chatbot remembers your name and previous questions.

  1. To view the Message Logs pane, in the Playground pane, click Options, and then click Message logs. The Message Logs pane displays all previous messages.

Message logs pane

Use Session ID with the memory chatbot flow​

session_id is a unique identifier in Langflow that stores conversation sessions between the AI and a user. A session_id is created when a conversation is initiated, and then associated with all subsequent messages during that session.

In the Memory Chatbot flow you created, the Message history component references past interactions by Session ID. You can demonstrate this by modifying the Session ID value to switch between conversation histories.

  1. In the Session ID field of the Message history and Chat Input components, add a Session ID value like MySessionID.
  2. Now, once you send a new message the Playground, you should have a new session created in the Message Logs pane.
  3. Note how your conversation is being stored in different memory sessions.

To learn more about memory in Langflow, see Memory.

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