notice

This is documentation for Rasa Open Source Documentation v2.1.x, which is no longer actively maintained.
For up-to-date documentation, see the latest version (2.5.x).

Version: 2.1.x

rasa.core.featurizers.tracker_featurizers

InvalidStory Objects

class InvalidStory(RasaException)

Exception that can be raised if story cannot be featurized.

TrackerFeaturizer Objects

class TrackerFeaturizer()

Base class for actual tracker featurizers.

__init__

| __init__(state_featurizer: Optional[SingleStateFeaturizer] = None) -> None

Initialize the tracker featurizer.

Arguments:

  • state_featurizer - The state featurizer used to encode the states.

training_states_and_actions

| training_states_and_actions(trackers: List[DialogueStateTracker], domain: Domain) -> Tuple[List[List[State]], List[List[Text]]]

Transforms list of trackers to lists of states and actions.

Arguments:

  • trackers - The trackers to transform
  • domain - The domain

Returns:

A tuple of list of states and list of actions.

featurize_trackers

| featurize_trackers(trackers: List[DialogueStateTracker], domain: Domain, interpreter: NaturalLanguageInterpreter) -> Tuple[List[List[Dict[Text, List["Features"]]]], np.ndarray]

Featurize the training trackers.

Arguments:

  • trackers - list of training trackers
  • domain - the domain
  • interpreter - the interpreter

Returns:

  • a dictionary of state types (INTENT, TEXT, ACTION_NAME, ACTION_TEXT, ENTITIES, SLOTS, ACTIVE_LOOP) to a list of features for all dialogue turns in all training trackers
  • the label ids (e.g. action ids) for every dialuge turn in all training trackers

prediction_states

| prediction_states(trackers: List[DialogueStateTracker], domain: Domain) -> List[List[State]]

Transforms list of trackers to lists of states for prediction.

Arguments:

  • trackers - The trackers to transform
  • domain - The domain

Returns:

A list of states.

create_state_features

| create_state_features(trackers: List[DialogueStateTracker], domain: Domain, interpreter: NaturalLanguageInterpreter) -> List[List[Dict[Text, List["Features"]]]]

Create state features for prediction.

Arguments:

  • trackers - A list of state trackers
  • domain - The domain
  • interpreter - The interpreter

Returns:

A dictionary of state type (INTENT, TEXT, ACTION_NAME, ACTION_TEXT, ENTITIES, SLOTS, ACTIVE_LOOP) to a list of features for all dialogue turns in all trackers.

persist

| persist(path: Union[Text, Path]) -> None

Persist the tracker featurizer to the given path.

Arguments:

  • path - The path to persist the tracker featurizer to.

load

| @staticmethod
| load(path: Text) -> Optional["TrackerFeaturizer"]

Load the featurizer from file.

Arguments:

  • path - The path to load the tracker featurizer from.

Returns:

The loaded tracker featurizer.

FullDialogueTrackerFeaturizer Objects

class FullDialogueTrackerFeaturizer(TrackerFeaturizer)

Creates full dialogue training data for time distributed architectures.

Creates training data that uses each time output for prediction. Training data is padded up to the length of the longest dialogue with -1.

training_states_and_actions

| training_states_and_actions(trackers: List[DialogueStateTracker], domain: Domain) -> Tuple[List[List[State]], List[List[Text]]]

Transforms list of trackers to lists of states and actions.

Training data is padded up to the length of the longest dialogue with -1.

Arguments:

  • trackers - The trackers to transform
  • domain - The domain

Returns:

A tuple of list of states and list of actions.

prediction_states

| prediction_states(trackers: List[DialogueStateTracker], domain: Domain) -> List[List[State]]

Transforms list of trackers to lists of states for prediction.

Arguments:

  • trackers - The trackers to transform
  • domain - The domain

Returns:

A list of states.

MaxHistoryTrackerFeaturizer Objects

class MaxHistoryTrackerFeaturizer(TrackerFeaturizer)

Slices the tracker history into max_history batches.

Creates training data that uses last output for prediction. Training data is padded up to the max_history with -1.

slice_state_history

| @staticmethod
| slice_state_history(states: List[State], slice_length: Optional[int]) -> List[State]

Slice states from the trackers history.

If the slice is at the array borders, padding will be added to ensure the slice length.

Arguments:

  • states - The states
  • slice_length - The slice length

Returns:

The sliced states.

training_states_and_actions

| training_states_and_actions(trackers: List[DialogueStateTracker], domain: Domain) -> Tuple[List[List[State]], List[List[Text]]]

Transforms list of trackers to lists of states and actions.

Training data is padded up to the length of the longest dialogue with -1.

Arguments:

  • trackers - The trackers to transform
  • domain - The domain

Returns:

A tuple of list of states and list of actions.

prediction_states

| prediction_states(trackers: List[DialogueStateTracker], domain: Domain) -> List[List[State]]

Transforms list of trackers to lists of states for prediction.

Arguments:

  • trackers - The trackers to transform
  • domain - The domain

Returns:

A list of states.