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Here is the full list of slot types defined by Rasa Core.
Slots are your bot’s memory. They act as a key-value storewhich can be used to store information the user provided (e.g their home city)as well as information gathered about the outside world (e.g. the result of adatabase query).
Most of the time, you want slots to influence how the dialogue progresses.There are different slot types for different behaviors.
For example, if your user has provided their home city, you mighthave a text slot called home_city. If the user asks for theweather, and you don’t know their home city, you will have to askthem for it. A text slot only tells Rasa Core whether the slothas a value. The specific value of a text slot (e.g. Bangaloreor New York or Hong Kong) doesn’t make any difference.
If the value itself is important, use a categorical or a bool slot.There are also float, and list slots.If you just want to store some data, but don’t want it to affect the flowof the conversation, use an unfeaturized slot.
How Rasa Uses Slots¶
The rasa_core.policies.Policy doesn’t have access to thevalue of your slots. It receives a featurized representation.As mentioned above, for a text slot the value is irrelevant.The policy just sees a 1 or 0 depending on whether it is set.
You should choose your slot types carefully!
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How Slots Get Set¶
You can provide an initial value for a slot in your domain file:
There are multiple ways that slots are set during a conversation:
Slots Set from NLU¶
If your NLU model picks up an entity, and your domain contains aslot with the same name, the slot will be set automatically. For example:
In this case, you don’t have to include the -slot{} part in thestory, because it is automatically picked up.
Slots Set By Clicking Buttons¶
You can use buttons as a shortcut.Rasa Core will send messages starting with a / to theRegexInterpreter, which expects NLU input in the same formatas in story files, e.g. /intent{entities}. For example, if you letusers choose a color by clicking a button, the button payloads mightbe /choose{'color':'blue'} and /choose{'color':'red'}.
You can specify this in your domain file like this:(see details in Domain Format)
Slots Set by Actions¶
The second option is to set slots by returning events in Actions.In this case, your stories need to include the slots.For example, you have a custom action to fetch a user’s profile, andyou have a categorical slot called account_type.When the fetch_profile action is run, it returns arasa_core.events.SlotSet event:
In this case you do have to include the -slot{} part in your stories.Rasa Core will learn to use this information to decide on the correct action totake (in this case, utter_welcome_premuim or utter_welcome_basic).
Note
It is very easy to forget about slots if you are writingstories by hand. We strongly recommend that you build up thesestories using Interactive Learning rather than writing them.
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Custom Slot Types¶
Maybe your restaurant booking system can only handle bookingsfor up to 6 people. In this case you want the value of theslot to influence the next selected action (and not just whetherit’s been specified). You can do this by defining a custom slot class.
In the code below, we define a slot class called NumberOfPeopleSlot.The featurization defines how the value of this slot gets converted to a vectorto our machine learning model can deal with.Our slot has three possible “values”, which we can represent witha vector of length 2.
(0,0) | not yet set |
(1,0) | between 1 and 6 |
(0,1) | more than 6 |
Now we also need some training stories, so that Rasa Corecan learn from these how to handle the different situations:
Have questions or feedback?¶
We have a very active support community on Rasa Community Forumthat is happy to help you with your questions. If you have any feedback for us or a specificsuggestion for improving the docs, feel free to share it by creating an issue on Rasa CoreGitHub repository.