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This is documentation for Rasa Open Source Documentation v2.1.x, which is no longer actively maintained.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 (2.2.x).

Version: 2.1.x

rasa.core.actions.action

default_actions

default_actions(action_endpoint: Optional[EndpointConfig] = None) -> List["Action"]

List default actions.

action_for_index

action_for_index(index: int, domain: Domain, action_endpoint: Optional[EndpointConfig]) -> "Action"

Get an action based on its index in the list of available actions.

Arguments:

  • index - The index of the action. This is usually used by Policys as they predict the action index instead of the name.
  • domain - The Domain of the current model. The domain contains the actions provided by the user + the default actions.
  • action_endpoint - Can be used to run custom_actions (e.g. using the rasa-sdk).

Returns:

The instantiated Action or None if no Action was found for the given index.

action_for_name

action_for_name(action_name: Text, domain: Domain, action_endpoint: Optional[EndpointConfig]) -> "Action"

Create an Action object based on the name of the Action.

Arguments:

  • action_name - The name of the Action.
  • domain - The Domain of the current model. The domain contains the actions provided by the user + the default actions.
  • action_endpoint - Can be used to run custom_actions (e.g. using the rasa-sdk).

Returns:

The instantiated Action or None if no Action was found for the given index.

is_retrieval_action

is_retrieval_action(action_name: Text, retrieval_intents: List[Text]) -> bool

Check if an action name is a retrieval action.

The name for a retrieval action has an extra utter_ prefix added to the corresponding retrieval intent name.

Arguments:

  • action_name - Name of the action.
  • retrieval_intents - List of retrieval intents defined in the NLU training data.

Returns:

True if the resolved intent name is present in the list of retrieval intents, False otherwise.

action_from_name

action_from_name(name: Text, domain: Domain, action_endpoint: Optional[EndpointConfig]) -> "Action"

Retrieves an action by its name.

Arguments:

  • name - The name of the action.
  • domain - The current model domain.
  • action_endpoint - The endpoint to execute custom actions.

Returns:

The instantiated action.

create_bot_utterance

create_bot_utterance(message: Dict[Text, Any]) -> BotUttered

Create BotUttered event from message.

Action Objects

class Action()

Next action to be taken in response to a dialogue state.

name

| name() -> Text

Unique identifier of this simple action.

run

| async run(output_channel: "OutputChannel", nlg: "NaturalLanguageGenerator", tracker: "DialogueStateTracker", domain: "Domain") -> List[Event]

Execute the side effects of this action.

Arguments:

  • nlg - which nlg to use for response generation
  • output_channel - output_channel to which to send the resulting message.
  • tracker DialogueStateTracker - the state tracker for the current user. You can access slot values using tracker.get_slot(slot_name) and the most recent user message is tracker.latest_message.text.
  • domain Domain - the bot's domain
  • metadata - dictionary that can be sent to action server with custom data.

Returns:

  • List[Event] - A list of :class:rasa.core.events.Event instances

ActionUtterTemplate Objects

class ActionUtterTemplate(Action)

An action which only effect is to utter a template when it is run.

Both, name and utter template, need to be specified using the name method.

run

| async run(output_channel: "OutputChannel", nlg: "NaturalLanguageGenerator", tracker: "DialogueStateTracker", domain: "Domain") -> List[Event]

Simple run implementation uttering a (hopefully defined) template.

ActionRetrieveResponse Objects

class ActionRetrieveResponse(ActionUtterTemplate)

An action which queries the Response Selector for the appropriate response.

intent_name_from_action

| @staticmethod
| intent_name_from_action(action_name: Text) -> Text

Resolve the name of the intent from the action name.

action_name_from_intent

| @staticmethod
| action_name_from_intent(intent_name: Text) -> Text

Resolve the action name from the name of the intent.

run

| async run(output_channel: "OutputChannel", nlg: "NaturalLanguageGenerator", tracker: "DialogueStateTracker", domain: "Domain") -> List[Event]

Query the appropriate response and create a bot utterance with that.

ActionBack Objects

class ActionBack(ActionUtterTemplate)

Revert the tracker state by two user utterances.

ActionListen Objects

class ActionListen(Action)

The first action in any turn - bot waits for a user message.

The bot should stop taking further actions and wait for the user to say something.

ActionRestart Objects

class ActionRestart(ActionUtterTemplate)

Resets the tracker to its initial state.

Utters the restart response if available.

ActionSessionStart Objects

class ActionSessionStart(Action)

Applies a conversation session start.

Takes all SlotSet events from the previous session and applies them to the new session.

ActionDefaultFallback Objects

class ActionDefaultFallback(ActionUtterTemplate)

Executes the fallback action and goes back to the previous state of the dialogue

ActionDeactivateLoop Objects

class ActionDeactivateLoop(Action)

Deactivates an active loop.

RemoteAction Objects

class RemoteAction(Action)

action_response_format_spec

| @staticmethod
| action_response_format_spec() -> Dict[Text, Any]

Expected response schema for an Action endpoint.

Used for validation of the response returned from the Action endpoint.

ActionExecutionRejection Objects

class ActionExecutionRejection(RasaException)

Raising this exception will allow other policies to predict a different action

ActionRevertFallbackEvents Objects

class ActionRevertFallbackEvents(Action)

Reverts events which were done during the TwoStageFallbackPolicy.

This reverts user messages and bot utterances done during a fallback of the TwoStageFallbackPolicy. By doing so it is not necessary to write custom stories for the different paths, but only of the happy path. This is deprecated and can be removed once the TwoStageFallbackPolicy is removed.

ActionDefaultAskAffirmation Objects

class ActionDefaultAskAffirmation(Action)

Default implementation which asks the user to affirm his intent.

It is suggested to overwrite this default action with a custom action to have more meaningful prompts for the affirmations. E.g. have a description of the intent instead of its identifier name.

ActionDefaultAskRephrase Objects

class ActionDefaultAskRephrase(ActionUtterTemplate)

Default implementation which asks the user to rephrase his intent.