If a slot is not requested, slot mapping doesn't work

Rasa Open Source
1

Hi !

During some tests with Role Entities, I figure out my slot mapping doesn’t work like I tought. Currently, it work because my slots names and my entities names are the same.

But I tried to change one and it is not fill now.

My test is with the same intent, it trigger the FormAction action_get_top_users which the beginning is :

class ActionGetTopUsers(FormAction):

    def name(self) -> Text:
        return "action_get_top_users"

    @staticmethod
    def required_slots(tracker: Tracker) -> List[Text]:
        """A list of required slots that the form has to fill"""
        return ["moment", "application"]

    def slot_mappings(self) -> Dict[Text, Any]:
        return {"moment": self.from_entity(entity="moment",
                                                  intent=["moment_added",
                                                          "top_users"]),
                "application": self.from_entity(entity="application",
                                             intent=["application_added", 
                                                     "top_users"]),
                "site": self.from_entity(entity="city-site",
                                             intent=["city_added", "top_users"])}

If i had site to my requested slot (just by adding it in the list of required_slot), the debug is

2020-05-25 15:07:45 **DEBUG** rasa_sdk.forms - Activated the form 'action_get_top_users'
2020-05-25 15:07:45 **DEBUG** rasa_sdk.forms - Validating pre-filled required slots: {'moment': 'hier', 'application': 'skype'}
2020-05-25 15:07:45 **DEBUG** rasa_sdk.forms - Validating user input '{'intent': {'name': 'top_users', 'confidence': 0.9999955296516411}, 
'entities': [{'entity': 'application', 'start': 14, 'end': 19, 'value': 'skype', 'extractor': 'DIETClassifier'}, 
{'entity': 'moment', 'start': 20, 'end': 24, 'value': 'hier', 'extractor': 'DIETClassifier'}, 
{'entity': 'city-site', 'start': 27, 'end': 32, 'value': 'Porto', 'extractor': 'DIETClassifier'}], 
'intent_ranking': [{'name': 'top_users', 'confidence': 0.9999955296516411}, 
{'name': 'mood_unhappy_return_question', 'confidence': 2.146076894860016e-06}, 
{'name': 'goodbye', 'confidence': 5.99835573211749e-07}, 
{'name': 'temperature', 'confidence': 5.354330596674117e-07}, 
{'name': 'mood_great_return_question', 'confidence': 3.627311855325388e-07}, 
{'name': 'bot_challenge', 'confidence': 2.8670544338638143e-07}, 
{'name': 'greet', 'confidence': 1.801675466595043e-07}, 
{'name': 'deny', 'confidence': 1.6207697228765017e-07}, 
{'name': 'reseau_action', 'confidence': 1.442294745856998e-07}, 
{'name': 'weather', 'confidence': 8.303375409468572e-08}], 'text': 'qui a utilisé skype hier à Porto ?'}'
2020-05-25 15:07:45 **DEBUG** rasa_sdk.forms - Extracted 'hier' for extra slot 'moment'.
2020-05-25 15:07:45 **DEBUG** rasa_sdk.forms - Extracted 'skype' for extra slot 'application'.
2020-05-25 15:07:45 **DEBUG** rasa_sdk.forms - Extracted 'Porto' for extra slot 'site'.
2020-05-25 15:07:45 **DEBUG** rasa_sdk.forms - Validating extracted slots: {'moment': 'hier', 'application': 'skype', 'site': 'Porto'}
2020-05-25 15:07:45 **DEBUG** rasa_sdk.forms - No slots left to request, all required slots are filled:
moment: hier
application: skype
site: Porto
2020-05-25 15:07:45 **DEBUG** rasa_sdk.forms - Submitting the form 'action_get_top_users'

So we can see I have all my slot filled.

But if site is not required :

2020-05-25 15:12:41 **DEBUG** rasa_sdk.forms - Activated the form 'action_get_top_users'
2020-05-25 15:12:41 **DEBUG** rasa_sdk.forms - Validating pre-filled required slots: {'moment': 'hier', 'application': 'skype'}
2020-05-25 15:12:41 **DEBUG** rasa_sdk.forms - Validating user input '{'intent': {'name': 'top_users', 'confidence': 0.9999955296516411}, 
'entities': [{'entity': 'application', 'start': 14, 'end': 19, 'value': 'skype', 'extractor': 'DIETClassifier'}, 
{'entity': 'moment', 'start': 20, 'end': 24, 'value': 'hier', 'extractor': 'DIETClassifier'}, 
{'entity': 'city-site', 'start': 27, 'end': 32, 'value': 'Porto', 'extractor': 'DIETClassifier'}], 
'intent_ranking': [{'name': 'top_users', 'confidence': 0.9999955296516411}, 
{'name': 'mood_unhappy_return_question', 'confidence': 2.146076894860016e-06}, 
{'name': 'goodbye', 'confidence': 5.99835573211749e-07}, 
{'name': 'temperature', 'confidence': 5.354330596674117e-07}, 
{'name': 'mood_great_return_question', 'confidence': 3.627311855325388e-07}, 
{'name': 'bot_challenge', 'confidence': 2.8670544338638143e-07}, 
{'name': 'greet', 'confidence': 1.801675466595043e-07}, 
{'name': 'deny', 'confidence': 1.6207697228765017e-07}, 
{'name': 'reseau_action', 'confidence': 1.442294745856998e-07}, 
{'name': 'weather', 'confidence': 8.303375409468572e-08}], 'text': 'qui a utilisé skype hier à Porto ?'}'
2020-05-25 15:12:41 **DEBUG** rasa_sdk.forms - Extracted 'hier' for extra slot 'moment'.
2020-05-25 15:12:41 **DEBUG** rasa_sdk.forms - Extracted 'skype' for extra slot 'application'.
2020-05-25 15:12:41 **DEBUG** rasa_sdk.forms - Validating extracted slots: {'moment': 'hier', 'application': 'skype'}
2020-05-25 15:12:41 **DEBUG** rasa_sdk.forms - No slots left to request, all required slots are filled:
moment: hier
application: skype
2020-05-25 15:12:41 **DEBUG** rasa_sdk.forms - Submitting the form 'action_get_top_users'

The Validating Input User part is exactly the same in both cases, but it doesn’t extract the same information and I don’t understand why ?

I thought that slot_mapping in a FormAction work even if the slot is not requested.

Can you help me please ?

Thank you

2

The custom slot mappings only work for requested slots, see the example in de docs. If you want to see how this is implemented you can also check the get_mappings_for_slot function.

3

Okay thank you, but in fact I don’t see in the documentation that Slot Mapping only works for requested Slot, I think it should be interesting to precise it. So now, I only need to find how to set not requested slot !

4

I agree that it is somewhat unclear but the first sentence of the comment in the code example states: “A dictionary to map required slots to…”

5

ow I’m sorry, this is true ^^" Read better would avoid me some trouble

6

To set a slot that has not been requested you could try to hook into the request_next_slot:

def request_next_slot(self, dispatcher, tracker, domain):
        next_slot = super().request_next_slot(dispatcher, tracker, domain)

        # All required slots have been filled
        if not next_slot:
            # Check whether the 'site' slot has been filled
            if not tracker.get_slot('site'):
                # Set the slot
                return [SlotSet('site', 'foobar')]

        return next_slot

My use of the function is a little different so I’m not 100% sure if the code above will work directly for your usecase.

7

Okay thank you, I’ll watch to this, thank you for your time !

8

@flythe globally, your code is good, i can have optional slot, but when I have one, I need to do an other input to launch my action.

Thank you, I keep looking for a solution.