Problem when filling slots with custom form (Failed to extract slot) - rasa-nlu

Question

I'm implementing an action form to collect all the required data for some processing but I got this error:
2020-04-09 09:19:13 ERROR rasa_sdk.endpoint - Failed to extract slot type with action places_form
2020-04-09 09:19:13 ERROR rasa.core.actions.action - Failed to extract slot type with action places_form
This custom form must collect two required slots: city and type. The first one is collected from an entity of an intent. For example: Give me all places for [Rennes](city). This works fine.
But the previous intent doesn't contain the type hint and the action form and I want an additional question to be triggered. For example: Which type of places?.
Here is the code of this action form:
class CustomFormAction(FormAction):
def name(self):
return ""
def request_next_slot(
self,
dispatcher: CollectingDispatcher,
tracker: Tracker,
domain: Dict[Text, Any],
) -> Optional[List[EventType]]:
"""Request the next slot and utter template if needed,
else return None"""
for slot in self.required_slots(tracker):
if self._should_request_slot(tracker, slot):
# logger.debug(f"Request next slot '{slot}'")
dispatcher.utter_message(
template=f"utter_ask_{self.name()}_{slot}", **tracker.slots
)
return [SlotSet(REQUESTED_SLOT, slot)]
return None
class PlacesForm(CustomFormAction):
def name(self) -> Text:
return "places_form"
#staticmethod
def required_slots(tracker: Tracker) -> List[Text]:
return ["city", "type"]
def submit(
self,
dispatcher: CollectingDispatcher,
tracker: Tracker,
domain: Dict[Text, Any],
) -> List[Dict]:
city = tracker.get_slot("city")
print("city : {}".format(city))
print("domain : {}".format(json.dumps(domain)))
elements = requests.get("http://...").json()
dispatcher.utter_message(template="utter_places")
dispatcher.utter_message(json.dumps(elements))
return []
Here is the way I defined the associated story:
## places
* places
- places_form
- form{"name": "places_form"}
And the places intent:
## intent:places
- Give me places around [Rennes](city)
- What are the places around [Rennes](city)
- I'm looking for places around [Rennes](city)
- Give me all places for [Rennes](city)
I have the FormPolicy in my config.yml file:
policies:
- name: FallbackPolicy
nlu_threshold: 0.75
- name: AugmentedMemoizationPolicy
- name: FormPolicy
- name: MappingPolicy
- name: TEDPolicy
epochs: 20
Here are the logs regarding the conversation:
Your input -> Give me all places for Rennes
2020-04-09 09:19:07 DEBUG rasa.core.tracker_store - Creating a new tracker for id '8fcaa471f975433ca5e4c1af83b8ca38'.
2020-04-09 09:19:07 DEBUG rasa.core.processor - Starting a new session for conversation ID '8fcaa471f975433ca5e4c1af83b8ca38'.
2020-04-09 09:19:07 DEBUG rasa.core.processor - Action 'action_session_start' ended with events '[<rasa.core.events.SessionStarted object at 0x7fb3d9ab0e48>, <rasa.core.events.ActionExecuted object at 0x7fb3d9ab0e10>]'.
2020-04-09 09:19:07 DEBUG rasa.core.processor - Current slot values:
city: None
requested_slot: None
type: None
2020-04-09 09:19:08 DEBUG rasa.nlu.classifiers.diet_classifier - There is no trained model: component is either not trained or didn't receive enough training data.
2020-04-09 09:19:08 DEBUG rasa.nlu.selectors.response_selector - Adding following selector key to message property: default
2020-04-09 09:19:08 DEBUG rasa.core.processor - Received user message 'Give me all places for Rennes' with intent '{'name': 'places', 'confidence': 0.9888553619384766}' and entities '[{'entity': 'city', 'start': 31, 'end': 38, 'extractor': 'DIETClassifier', 'value': 'Rennes'}]'
2020-04-09 09:19:08 DEBUG rasa.core.processor - Current slot values:
city: Rennes
requested_slot: None
type: None
2020-04-09 09:19:08 DEBUG rasa.core.processor - Logged UserUtterance - tracker now has 5 events.
2020-04-09 09:19:08 DEBUG rasa.core.policies.fallback - NLU confidence threshold met, confidence of fallback action set to core threshold (0.3).
2020-04-09 09:19:08 DEBUG rasa.core.policies.memoization - Current tracker state [None, None, None, {}, {'intent_places': 1.0, 'entity_city': 1.0, 'prev_action_listen': 1.0}]
2020-04-09 09:19:08 DEBUG rasa.core.policies.memoization - Launch DeLorean...
2020-04-09 09:19:08 DEBUG rasa.core.policies.memoization - Current tracker state [None, None, None, {}, {'intent_places': 1.0, 'entity_city': 1.0, 'prev_action_listen': 1.0}]
2020-04-09 09:19:08 DEBUG rasa.core.policies.memoization - There is no memorised next action
2020-04-09 09:19:08 DEBUG rasa.core.policies.form_policy - There is no active form
2020-04-09 09:19:08 DEBUG rasa.core.policies.ensemble - Predicted next action using policy_4_TEDPolicy
2020-04-09 09:19:08 DEBUG rasa.core.processor - Predicted next action 'places_form' with confidence 0.92.
2020-04-09 09:19:08 DEBUG rasa.core.actions.action - Calling action endpoint to run action 'places_form'.
2020-04-09 09:19:08 DEBUG rasa.core.processor - Action 'places_form' ended with events '[BotUttered('Quelle est la valeur du type?', {"elements": null, "quick_replies": null, "buttons": null, "attachment": null, "image": null, "custom": null}, {"city": "Rennes"}, 1586416748.2458563), <rasa.core.events.Form object at 0x7fb3d9a6bcc0>, <rasa.core.events.SlotSet object at 0x7fb3d9ab0da0>, <rasa.core.events.SlotSet object at 0x7fb429a027b8>, <rasa.core.events.SlotSet object at 0x7fb3d9dbb400>]'.
2020-04-09 09:19:08 DEBUG rasa.core.processor - Current slot values:
city: Rennes
requested_slot: type
type: None
2020-04-09 09:19:08 DEBUG rasa.core.policies.fallback - NLU confidence threshold met, confidence of fallback action set to core threshold (0.3).
2020-04-09 09:19:08 DEBUG rasa.core.policies.memoization - Current tracker state [None, None, None, {}, {'intent_places': 1.0, 'entity_city': 1.0, 'prev_action_listen': 1.0}]
2020-04-09 09:19:08 DEBUG rasa.core.policies.memoization - Launch DeLorean...
2020-04-09 09:19:08 DEBUG rasa.core.policies.memoization - Current tracker state [None, None, None, None, {}]
2020-04-09 09:19:08 DEBUG rasa.core.policies.memoization - There is a memorised next action 'action_listen'
2020-04-09 09:19:08 DEBUG rasa.core.policies.form_policy - There is an active form 'places_form'
2020-04-09 09:19:08 DEBUG rasa.core.policies.mapping_policy - There is no mapped action for the predicted intent, 'places'.
2020-04-09 09:19:08 DEBUG rasa.core.policies.ensemble - Predicted next action using policy_2_FormPolicy
2020-04-09 09:19:08 DEBUG rasa.core.processor - Predicted next action 'action_listen' with confidence 1.00.
2020-04-09 09:19:08 DEBUG rasa.core.processor - Action 'action_listen' ended with events '[]'.
2020-04-09 09:19:08 DEBUG rasa.core.lock_store - Deleted lock for conversation '8fcaa471f975433ca5e4c1af83b8ca38'.
Quelle est la valeur du type?
Your input -> tt
2020-04-09 09:19:13 DEBUG rasa.core.tracker_store - Recreating tracker for id '8fcaa471f975433ca5e4c1af83b8ca38'
2020-04-09 09:19:13 DEBUG rasa.nlu.classifiers.diet_classifier - There is no trained model: component is either not trained or didn't receive enough training data.
2020-04-09 09:19:13 DEBUG rasa.nlu.selectors.response_selector - Adding following selector key to message property: default
2020-04-09 09:19:13 DEBUG rasa.core.processor - Received user message 'tt' with intent '{'name': 'deny', 'confidence': 0.5609110593795776}' and entities '[]'
2020-04-09 09:19:13 DEBUG rasa.core.processor - Logged UserUtterance - tracker now has 13 events.
2020-04-09 09:19:13 DEBUG rasa.core.policies.fallback - NLU confidence 0.5609110593795776 is lower than NLU threshold 0.75.
2020-04-09 09:19:13 DEBUG rasa.core.policies.memoization - Current tracker state [None, {}, {'intent_places': 1.0, 'entity_city': 1.0, 'prev_action_listen': 1.0}, {'intent_places': 1.0, 'entity_city': 1.0, 'active_form_places_form': 1.0, 'prev_places_form': 1.0}, {'intent_deny': 1.0, 'prev_action_listen': 1.0, 'active_form_places_form': 1.0}]
2020-04-09 09:19:13 DEBUG rasa.core.policies.memoization - Launch DeLorean...
2020-04-09 09:19:13 DEBUG rasa.core.policies.memoization - Current tracker state [None, None, None, {}, {'intent_deny': 1.0, 'prev_action_listen': 1.0}]
2020-04-09 09:19:13 DEBUG rasa.core.policies.memoization - There is no memorised next action
2020-04-09 09:19:13 DEBUG rasa.core.policies.form_policy - There is an active form 'places_form'
2020-04-09 09:19:13 DEBUG rasa.core.policies.ensemble - Predicted next action using policy_2_FormPolicy
2020-04-09 09:19:13 DEBUG rasa.core.processor - Predicted next action 'places_form' with confidence 1.00.
2020-04-09 09:19:13 DEBUG rasa.core.actions.action - Calling action endpoint to run action 'places_form'.
2020-04-09 09:19:13 ERROR rasa_sdk.endpoint - Failed to extract slot type with action places_form
2020-04-09 09:19:13 ERROR rasa.core.actions.action - Failed to extract slot type with action places_form
2020-04-09 09:19:13 DEBUG rasa.core.policies.fallback - NLU confidence 0.5609110593795776 is lower than NLU threshold 0.75.
2020-04-09 09:19:13 DEBUG rasa.core.policies.memoization - Current tracker state [None, {}, {'intent_places': 1.0, 'entity_city': 1.0, 'prev_action_listen': 1.0}, {'intent_places': 1.0, 'entity_city': 1.0, 'active_form_places_form': 1.0, 'prev_places_form': 1.0}, {'intent_deny': 1.0, 'prev_action_listen': 1.0, 'active_form_places_form': 1.0}]
2020-04-09 09:19:13 DEBUG rasa.core.policies.memoization - Launch DeLorean...
2020-04-09 09:19:13 DEBUG rasa.core.policies.memoization - Current tracker state [None, None, None, {}, {'intent_deny': 1.0, 'prev_action_listen': 1.0}]
2020-04-09 09:19:13 DEBUG rasa.core.policies.memoization - There is no memorised next action
2020-04-09 09:19:13 DEBUG rasa.core.policies.form_policy - There is an active form 'places_form'
2020-04-09 09:19:13 DEBUG rasa.core.policies.ensemble - Execution of 'places_form' was rejected. Setting its confidence to 0.0 in all predictions.
2020-04-09 09:19:13 DEBUG rasa.core.policies.ensemble - Predicted next action using policy_0_FallbackPolicy
2020-04-09 09:19:13 DEBUG rasa.core.processor - Predicted next action 'action_default_fallback' with confidence 1.00.
2020-04-09 09:19:13 DEBUG rasa.core.processor - Action 'action_default_fallback' ended with events '[<rasa.core.events.UserUtteranceReverted object at 0x7fb3d99625c0>]'.
2020-04-09 09:19:13 DEBUG rasa.core.processor - Current slot values:
city: Rennes
requested_slot: type
type: None
2020-04-09 09:19:13 DEBUG rasa.core.policies.fallback - NLU confidence threshold met, confidence of fallback action set to core threshold (0.3).
2020-04-09 09:19:13 DEBUG rasa.core.policies.memoization - Current tracker state [None, None, None, {}, {'intent_places': 1.0, 'entity_city': 1.0, 'prev_action_listen': 1.0}]
2020-04-09 09:19:13 DEBUG rasa.core.policies.memoization - Launch DeLorean...
2020-04-09 09:19:13 DEBUG rasa.core.policies.memoization - Current tracker state [None, None, None, None, {}]
2020-04-09 09:19:13 DEBUG rasa.core.policies.memoization - There is a memorised next action 'action_listen'
2020-04-09 09:19:13 DEBUG rasa.core.policies.form_policy - There is an active form 'places_form'
2020-04-09 09:19:13 DEBUG rasa.core.policies.mapping_policy - There is no mapped action for the predicted intent, 'places'.
2020-04-09 09:19:13 DEBUG rasa.core.policies.ensemble - Predicted next action using policy_2_FormPolicy
2020-04-09 09:19:13 DEBUG rasa.core.processor - Predicted next action 'action_listen' with confidence 1.00.
2020-04-09 09:19:13 DEBUG rasa.core.processor - Action 'action_listen' ended with events '[]'.
2020-04-09 09:19:13 DEBUG rasa.core.lock_store - Deleted lock for conversation '8fcaa471f975433ca5e4c1af83b8ca38'.```
Thanks very much for your help!
Thierry

Answer 1

You don't define slot_mappings, so it's going to assume that it should set the slot from an entity of the same name. But it seems you don't have any annotated type entities, so it can't extract it, and can't set the slot. Either define slot_mappings or add examples of the type entity.