These docs are for version 1.x of Rasa Open Source.

---

# User Guide

- [Installation](https://legacy-docs-v1.rasa.com/1.10.22/user-guide/installation/)
- [Tutorial: Rasa Basics](https://legacy-docs-v1.rasa.com/1.10.22/user-guide/rasa-tutorial/)
- [Tutorial: Building Assistants](https://legacy-docs-v1.rasa.com/1.10.22/user-guide/building-assistants/)
- [Command Line Interface](https://legacy-docs-v1.rasa.com/1.10.22/user-guide/command-line-interface/)
- [Architecture](https://legacy-docs-v1.rasa.com/1.10.22/user-guide/architecture/)
- [Messaging and Voice Channels](https://legacy-docs-v1.rasa.com/1.10.22/user-guide/messaging-and-voice-channels/)
- [Testing Your Assistant](https://legacy-docs-v1.rasa.com/1.10.22/user-guide/testing-your-assistant/)
- [Setting up CI/CD](https://legacy-docs-v1.rasa.com/1.10.22/user-guide/setting-up-ci-cd/)
- [Validate Data](https://legacy-docs-v1.rasa.com/1.10.22/user-guide/validate-files/)
- [Configuring the HTTP API](https://legacy-docs-v1.rasa.com/1.10.22/user-guide/configuring-http-api/)
- [Deploying Your Rasa Assistant](https://legacy-docs-v1.rasa.com/1.10.22/user-guide/how-to-deploy/)
- [Cloud Storage](https://legacy-docs-v1.rasa.com/1.10.22/user-guide/cloud-storage/)

# NLU

- [About](https://legacy-docs-v1.rasa.com/1.10.22/nlu/about/)
- [Using NLU Only](https://legacy-docs-v1.rasa.com/1.10.22/nlu/using-nlu-only/)
- [Training Data Format](https://legacy-docs-v1.rasa.com/1.10.22/nlu/training-data-format/)
- [Language Support](https://legacy-docs-v1.rasa.com/1.10.22/nlu/language-support/)
- [Choosing a Pipeline](https://legacy-docs-v1.rasa.com/1.10.22/nlu/choosing-a-pipeline/)
- [Components](https://legacy-docs-v1.rasa.com/1.10.22/nlu/components/)
- [Entity Extraction](https://legacy-docs-v1.rasa.com/1.10.22/nlu/entity-extraction/)

# Core

- [About](https://legacy-docs-v1.rasa.com/1.10.22/core/about/)
- [Stories](https://legacy-docs-v1.rasa.com/1.10.22/core/stories/)
- [Domains](https://legacy-docs-v1.rasa.com/1.10.22/core/domains/)
- [Responses](https://legacy-docs-v1.rasa.com/1.10.22/core/responses/)
- [Actions](https://legacy-docs-v1.rasa.com/1.10.22/core/actions/)
- [Reminders and External Events](https://legacy-docs-v1.rasa.com/1.10.22/core/reminders-and-external-events/)
- [Policies](https://legacy-docs-v1.rasa.com/1.10.22/core/policies/)
- [Slots](https://legacy-docs-v1.rasa.com/1.10.22/core/slots/)
- [Forms](https://legacy-docs-v1.rasa.com/1.10.22/core/forms/)
- [Retrieval Actions](https://legacy-docs-v1.rasa.com/1.10.22/core/retrieval-actions/)
- [Interactive Learning](https://legacy-docs-v1.rasa.com/1.10.22/core/interactive-learning/)
- [Fallback Actions](https://legacy-docs-v1.rasa.com/1.10.22/core/fallback-actions/)
- [Knowledge Base Actions](https://legacy-docs-v1.rasa.com/1.10.22/core/knowledge-bases/)

# Conversation Design

- [Dialogue Elements](https://legacy-docs-v1.rasa.com/1.10.22/dialogue-elements/dialogue-elements/)
- [Small Talk](https://legacy-docs-v1.rasa.com/1.10.22/dialogue-elements/small-talk/)
- [Completing Tasks](https://legacy-docs-v1.rasa.com/1.10.22/dialogue-elements/completing-tasks/)
- [Guiding Users](https://legacy-docs-v1.rasa.com/1.10.22/dialogue-elements/guiding-users/)

# API Reference

- [Action Server](https://legacy-docs-v1.rasa.com/1.10.22/api/action-server/)
- [HTTP API](https://legacy-docs-v1.rasa.com/1.10.22/api/http-api/)
- [Jupyter Notebooks](https://legacy-docs-v1.rasa.com/1.10.22/api/jupyter-notebooks/)
- [Agent](https://legacy-docs-v1.rasa.com/1.10.22/api/agent/)
- [Custom NLU Components](https://legacy-docs-v1.rasa.com/1.10.22/api/custom-nlu-components/)
- [Rasa SDK](https://legacy-docs-v1.rasa.com/1.10.22/api/rasa-sdk/)
- [Events](https://legacy-docs-v1.rasa.com/1.10.22/api/events/)
- [Tracker](https://legacy-docs-v1.rasa.com/1.10.22/api/tracker/#)
- [Tracker Stores](https://legacy-docs-v1.rasa.com/1.10.22/api/tracker-stores/)
- [Event Brokers](https://legacy-docs-v1.rasa.com/1.10.22/api/event-brokers/)
- [Lock Stores](https://legacy-docs-v1.rasa.com/1.10.22/api/lock-stores/)
- [Training Data Importers](https://legacy-docs-v1.rasa.com/1.10.22/api/training-data-importers/)
- [Featurization of Conversations](https://legacy-docs-v1.rasa.com/1.10.22/api/core-featurization/)
- [TensorFlow Configuration](https://legacy-docs-v1.rasa.com/1.10.22/api/tensorflow_usage/)
- [Migration Guide](https://legacy-docs-v1.rasa.com/1.10.22/migration-guide/)
- [Rasa Open Source Change Log](https://legacy-docs-v1.rasa.com/1.10.22/changelog/)

# Migrate from (beta)

- [Dialogflow](https://legacy-docs-v1.rasa.com/1.10.22/migrate-from/google-dialogflow-to-rasa/)
- [Wit.ai](https://legacy-docs-v1.rasa.com/1.10.22/migrate-from/facebook-wit-ai-to-rasa/)
- [LUIS](https://legacy-docs-v1.rasa.com/1.10.22/migrate-from/microsoft-luis-to-rasa/)
- [IBM Watson](https://legacy-docs-v1.rasa.com/1.10.22/migrate-from/ibm-watson-to-rasa/)

# Reference

- [Glossary](https://legacy-docs-v1.rasa.com/1.10.22/glossary/)

# Versions

viewing: 1.10.22

**Warning:** This document is for an old version of Rasa. The latest version is 1.10.26.

# Tracker

Trackers maintain the state of a dialogue between the assistant and the user in the form of conversation sessions. To learn more about how to configure the session behavior, check out the docs on [Session configuration](https://legacy-docs-v1.rasa.com/1.10.22/core/domains/#session-config).

_class_`rasa.core.trackers.``DialogueStateTracker`( _sender_id_, _slots_, _max_event_history=None_, _sender_source=None_)  
Maintains the state of a conversation.

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