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 behaviour, check out the docs on Session configuration.

class rasa.core.trackers.DialogueStateTracker(sender_id, slots, max_event_history=None, sender_source=None)

Maintains the state of a conversation.

The field max_event_history will only give you these last events, it can be set in the tracker_store

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 serialised 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

current_slot_values()

Return the currently set values of the slots

Return type Dict[str, Any]

current_state(event_verbosity=<EventVerbosity.NONE: 1>)

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

Usage Examples

Example 1: Getting Last Event

last_event = tracker.get_last_event_for('user')

Example 2: Getting Current Slot Values

slot_values = tracker.current_slot_values()

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