This is documentation for Rasa Open Source Documentation v2.x, which is no longer actively maintained.
For up-to-date documentation, see the latest version (3.x).

Version: 2.x

Rasa Architecture

Message Handling

This diagram shows the basic steps of how an assistant built with Rasa responds to a message:

Rasa Open Source architecture

The steps are:

  1. The message is received and passed to an Interpreter, which converts it into a dictionary including the original text, the intent, and any entities that were found. This part is handled by NLU.

  2. The message is passed from the Interpreter to the Tracker. The Tracker is the object which keeps track of conversation state.

  3. The current state of the tracker is sent to each policy.

  4. Each policy chooses which action to take next.

  5. The chosen action is logged by the tracker.

  6. A response is sent to the user.