These docs are for version 1.x of Rasa Open Source. - [Docs for the new version 2.0 can be found here.](/content/docs/rasa/index.html) ## User Guide - [Installation](https://legacy-docs-v1.rasa.com/1.10.21/user-guide/installation/) - [Tutorial: Rasa Basics](https://legacy-docs-v1.rasa.com/1.10.21/user-guide/rasa-tutorial/) - [Tutorial: Building Assistants](https://legacy-docs-v1.rasa.com/1.10.21/user-guide/building-assistants/) - [Command Line Interface](https://legacy-docs-v1.rasa.com/1.10.21/user-guide/command-line-interface/) - [Architecture](https://legacy-docs-v1.rasa.com/1.10.21/user-guide/architecture/) - [Messaging and Voice Channels](https://legacy-docs-v1.rasa.com/1.10.21/user-guide/messaging-and-voice-channels/) - [Testing Your Assistant](https://legacy-docs-v1.rasa.com/1.10.21/user-guide/testing-your-assistant/) - [Setting up CI/CD](https://legacy-docs-v1.rasa.com/1.10.21/user-guide/setting-up-ci-cd/) - [Validate Data](https://legacy-docs-v1.rasa.com/1.10.21/user-guide/validate-files/) - [Configuring the HTTP API](https://legacy-docs-v1.rasa.com/1.10.21/user-guide/configuring-http-api/) - [Deploying Your Rasa Assistant](https://legacy-docs-v1.rasa.com/1.10.21/user-guide/how-to-deploy/) - [Cloud Storage](https://legacy-docs-v1.rasa.com/1.10.21/user-guide/cloud-storage/) ## NLU - [About](https://legacy-docs-v1.rasa.com/1.10.21/nlu/about/) - [Using NLU Only](https://legacy-docs-v1.rasa.com/1.10.21/nlu/using-nlu-only/) - [Training Data Format](https://legacy-docs-v1.rasa.com/1.10.21/nlu/training-data-format/) - [Language Support](https://legacy-docs-v1.rasa.com/1.10.21/nlu/language-support/) - [Choosing a Pipeline](https://legacy-docs-v1.rasa.com/1.10.21/nlu/choosing-a-pipeline/) - [Components](https://legacy-docs-v1.rasa.com/1.10.21/nlu/components/) - [Entity Extraction](https://legacy-docs-v1.rasa.com/1.10.21/nlu/entity-extraction/) ## Core - [About](https://legacy-docs-v1.rasa.com/1.10.21/core/about/) - [Stories](https://legacy-docs-v1.rasa.com/1.10.21/core/stories/) - [Domains](https://legacy-docs-v1.rasa.com/1.10.21/core/domains/) - [Responses](https://legacy-docs-v1.rasa.com/1.10.21/core/responses/) - [Actions](https://legacy-docs-v1.rasa.com/1.10.21/core/actions/) - [Reminders and External Events](https://legacy-docs-v1.rasa.com/1.10.21/core/reminders-and-external-events/) - [Policies](https://legacy-docs-v1.rasa.com/1.10.21/core/policies/) - [Slots](https://legacy-docs-v1.rasa.com/1.10.21/core/slots/) - [Forms](https://legacy-docs-v1.rasa.com/1.10.21/core/forms/) - [Retrieval Actions](https://legacy-docs-v1.rasa.com/1.10.21/core/retrieval-actions/) - [Interactive Learning](https://legacy-docs-v1.rasa.com/1.10.21/core/interactive-learning/) - [Fallback Actions](https://legacy-docs-v1.rasa.com/1.10.21/core/fallback-actions/) - [Knowledge Base Actions](https://legacy-docs-v1.rasa.com/1.10.21/core/knowledge-bases/) ## Conversation Design - [Dialogue Elements](https://legacy-docs-v1.rasa.com/1.10.21/dialogue-elements/dialogue-elements/) - [Small Talk](https://legacy-docs-v1.rasa.com/1.10.21/dialogue-elements/small-talk/) - [Completing Tasks](https://legacy-docs-v1.rasa.com/1.10.21/dialogue-elements/completing-tasks/) - [Guiding Users](https://legacy-docs-v1.rasa.com/1.10.21/dialogue-elements/guiding-users/) ## API Reference - [Action Server](https://legacy-docs-v1.rasa.com/1.10.21/api/action-server/) - [HTTP API](https://legacy-docs-v1.rasa.com/1.10.21/api/http-api/) - [Jupyter Notebooks](https://legacy-docs-v1.rasa.com/1.10.21/api/jupyter-notebooks/) - [Agent](https://legacy-docs-v1.rasa.com/1.10.21/api/agent/) - [Custom NLU Components](https://legacy-docs-v1.rasa.com/1.10.21/api/custom-nlu-components/) - [Rasa SDK](https://legacy-docs-v1.rasa.com/1.10.21/api/rasa-sdk/) - [Events](https://legacy-docs-v1.rasa.com/1.10.21/api/events/) - [Tracker](https://legacy-docs-v1.rasa.com/1.10.21/api/tracker/#) - [Tracker Stores](https://legacy-docs-v1.rasa.com/1.10.21/api/tracker-stores/) - [Event Brokers](https://legacy-docs-v1.rasa.com/1.10.21/api/event-brokers/) - [Lock Stores](https://legacy-docs-v1.rasa.com/1.10.21/api/lock-stores/) - [Training Data Importers](https://legacy-docs-v1.rasa.com/1.10.21/api/training-data-importers/) - [Featurization of Conversations](https://legacy-docs-v1.rasa.com/1.10.21/api/core-featurization/) - [TensorFlow Configuration](https://legacy-docs-v1.rasa.com/1.10.21/api/tensorflow_usage/) - [Migration Guide](https://legacy-docs-v1.rasa.com/1.10.21/migration-guide/) - [Rasa Open Source Change Log](https://legacy-docs-v1.rasa.com/1.10.21/changelog/) ## Migrate from (beta) - [Dialogflow](https://legacy-docs-v1.rasa.com/1.10.21/migrate-from/google-dialogflow-to-rasa/) - [Wit.ai](https://legacy-docs-v1.rasa.com/1.10.21/migrate-from/facebook-wit-ai-to-rasa/) - [LUIS](https://legacy-docs-v1.rasa.com/1.10.21/migrate-from/microsoft-luis-to-rasa/) - [IBM Watson](https://legacy-docs-v1.rasa.com/1.10.21/migrate-from/ibm-watson-to-rasa/) ## Reference - [Glossary](https://legacy-docs-v1.rasa.com/1.10.21/glossary/) ## Versions viewing: 1.10.21 [**Warning:** This document is for an old version of Rasa. The latest version is 1.10.26.](https://legacy-docs-v1.rasa.com/1.10.26/api/tracker/) # 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/1.10.21/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. ### `applied_events()` Returns all actions that should be applied - w/o reverted events. Return type: `List[Event]` ### `as_dialogue()` Return a `Dialogue` object containing all of the turns. This can be serialized and later used to recover the state of this tracker exactly. Return type: `Dialogue` ### `change_form_to(form_name)` Activate or deactivate a form. Return type: `None` ### `clear_followup_action()` Clears follow-up action when it was executed. Return type: `None` ### `copy()` Creates a duplicate of this tracker. Return type: [`DialogueStateTracker`](https://legacy-docs-v1.rasa.com/1.10.21/api/tracker/#rasa.core.trackers.DialogueStateTracker) ### `current_slot_values()` Return the currently set values of the slots. Return type: `Dict[str, Any]` ### `current_state(event_verbosity=)` Return the current tracker state as an object. Return type: `Dict[str, Any]` ### `events_after_latest_restart()` Return a list of events after the most recent restart. Return type: `List[Event]` ### `export_stories(e2e=False, include_source=False)` Dump the tracker as a story in the Rasa Core story format. Returns the dumped tracker as a string. Return type: `str` ### `export_stories_to_file(export_path='debug.md')` Dump the tracker as a story to a file. Return type: `None` ### `classmethod from_dict(sender_id, events_as_dict, slots=None, max_event_history=None)` Create a tracker from dump. The dump should be an array of dumped events. When restoring the tracker, these events will be replayed to recreate the state. Return type: [`DialogueStateTracker`](https://legacy-docs-v1.rasa.com/1.10.21/api/tracker/#rasa.core.trackers.DialogueStateTracker) ### `generate_all_prior_trackers()` Returns a generator of the previous trackers of this tracker. Return type: `Generator[DialogueStateTracker, None, None]` ### `get_last_event_for(event_type, action_names_to_exclude=None, skip=0)` Gets the last event of a given type which was actually applied. Return type: `Optional[Event]` ### `get_latest_entity_values(entity_type, entity_role=None, entity_group=None)` Get entity values found for the passed entity type and optional role and group in the latest message. Return type: `Iterator[str]` ### `get_latest_input_channel()` Get the name of the input_channel of the latest UserUttered event. Return type: `Optional[str]` ### `get_slot(key)` Retrieves the value of a slot. Return type: `Optional[Any]` ### `idx_after_latest_restart()` Return the idx of the most recent restart in the list of events. Return type: `int` ### `init_copy()` Creates a new state tracker with the same initial values. Return type: [`DialogueStateTracker`](https://legacy-docs-v1.rasa.com/1.10.21/api/tracker/#rasa.core.trackers.DialogueStateTracker) ### `is_paused()` State whether the tracker is currently paused. Return type: `bool` ### `last_executed_action_has(name, skip=0)` Returns whether last ActionExecuted event had a specific name. Return type: `bool` ### `past_states(domain)` Generate the past states of this tracker based on the history. Return type: `deque` ### `recreate_from_dialogue(dialogue)` Use a serialized Dialogue to update the tracker's state. Return type: `None` ### `reject_action(action_name)` Notify active form that it was rejected. Return type: `None` ### `replay_events()` Update the tracker based on a list of events. Return type: `None` ### `set_form_validation(validate)` Toggle form validation. Return type: `None` ### `set_latest_action_name(action_name)` Set latest action name and reset form validation and rejection parameters. Return type: `None` ### `travel_back_in_time(target_time)` Creates a new tracker with a state at a specific timestamp. Return type: [`DialogueStateTracker`](https://legacy-docs-v1.rasa.com/1.10.21/api/tracker/#rasa.core.trackers.DialogueStateTracker) ### `trigger_followup_action(action)` Triggers another action following the execution of the current. Return type: `None` ### `update(event, domain=None)` Modify the state of the tracker according to an `Event`. Return type: `None` 👋 I can help you get started with Rasa and answer your technical questions.