def _results_for_user_denied(self, tracker: DialogueStateTracker,
domain: Domain) -> List[float]:
has_denied_before = tracker.last_executed_action_has(
ACTION_DEFAULT_ASK_REPHRASE_NAME, skip=1)
if has_denied_before:
return confidence_scores_for(self.fallback_nlu_action_name, 1.0,
domain)
else:
return confidence_scores_for(ACTION_DEFAULT_ASK_REPHRASE_NAME, 1.0,
domain)
def predict_action_probabilities(
self,
tracker: DialogueStateTracker,
domain: Domain,
interpreter: NaturalLanguageInterpreter,
**kwargs: Any,
) -> List[float]:
"""Predicts the next action if NLU confidence is low."""
nlu_data = tracker.latest_message.parse_data
last_intent_name = nlu_data["intent"].get(INTENT_NAME_KEY, None)
should_nlu_fallback = self.should_nlu_fallback(
nlu_data, tracker.latest_action.get(ACTION_NAME))
user_rephrased = has_user_rephrased(tracker)
if self._is_user_input_expected(tracker):
result = confidence_scores_for(ACTION_LISTEN_NAME, 1.0, domain)
elif self._has_user_denied(last_intent_name, tracker):
logger.debug(
f"User '{tracker.sender_id}' denied suggested intents.")
result = self._results_for_user_denied(tracker, domain)
elif user_rephrased and should_nlu_fallback:
logger.debug("Ambiguous rephrasing of user '{}' "
"for intent '{}'".format(tracker.sender_id,
last_intent_name))
result = confidence_scores_for(ACTION_DEFAULT_ASK_AFFIRMATION_NAME,
1.0, domain)
elif user_rephrased:
logger.debug(f"User '{tracker.sender_id}' rephrased intent")
result = confidence_scores_for(ACTION_REVERT_FALLBACK_EVENTS_NAME,
1.0, domain)
elif tracker.last_executed_action_has(
ACTION_DEFAULT_ASK_AFFIRMATION_NAME):
if not should_nlu_fallback:
logger.debug("User '{}' affirmed intent '{}'"
"".format(tracker.sender_id, last_intent_name))
result = confidence_scores_for(
ACTION_REVERT_FALLBACK_EVENTS_NAME, 1.0, domain)
else:
result = confidence_scores_for(self.fallback_nlu_action_name,
1.0, domain)
elif should_nlu_fallback:
logger.debug("User '{}' has to affirm intent '{}'.".format(
tracker.sender_id, last_intent_name))
result = confidence_scores_for(ACTION_DEFAULT_ASK_AFFIRMATION_NAME,
1.0, domain)
else:
logger.debug("NLU confidence threshold met, confidence of "
"fallback action set to core threshold ({}).".format(
self.core_threshold))
result = self.fallback_scores(domain, self.core_threshold)
return result
def has_user_rephrased(tracker: DialogueStateTracker) -> bool:
return tracker.last_executed_action_has(ACTION_DEFAULT_ASK_REPHRASE_NAME)
def _has_user_denied(self, last_intent: Text,
tracker: DialogueStateTracker) -> bool:
return (tracker.last_executed_action_has(
ACTION_DEFAULT_ASK_AFFIRMATION_NAME)
and last_intent == self.deny_suggestion_intent_name)
def _have_options_been_suggested(self,
tracker: DialogueStateTracker) -> bool:
return tracker.last_executed_action_has(self.disambiguation_action)
