Dialogflow

Entity for number of ingredients and number of recipe steps

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In a similar vein, you should add phrases about the number of recipe instruction steps such as “I’m looking for a recipe with less than 8 steps”, and the number of servings of a recipe. Use as parameter names nrOfSteps nrSteps and servings. This will make sure the MARBEL agent will receive filters of the form nrSteps=8 and servings=4 and store that in its conversational memory. Finally, also annotate for recipe duration for a parameter called duration but instead of @sys.number use the @sys.duration system entity of Dialogflow.

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Another way to improve your Dialogflow agent is to enable a user to include multiple requests in a single user expression. You can achieve this simply by including many more phrases such as “I’d like a Chinese recipe with less than 8 ingredients”. This will ensure that your conversational agent can recognize multiple filter requests.

Prolog and Patterns

Retrieving the (number of) ingredients and recipe steps

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• Now add a similar rule that applies a filter for the nrSteps feature; your Training phrases should dictate how to read the constraint. I.e., if your phrase says “less than N recipe steps” than you should write code that implements the filter to mean exactly that.

• Add a similar rule that applies a filter for the servings feature. You probably want to make sure that a recipe has exactly the right number of servings that the user asked for.

• Finally, add a rule that applies a filter for the duration feature. This feature is a bit more tricky and you should take the warning above about data types to heart. However, most of the work has already been done for you in the dialog_update.mod2g file in a step called Pre-process parameters of intent. In this step, the duration values received from Dialogflow are transformed to minutes (numbers) using the duration_to_min predicate defined in the utils.pl file. This means that to define the rule for filtering, you simply need to look up the time it takes to cook a recipe in the database (specified in minutes), and compare that value with the maximum duration that the user specified.

Visuals

Extend the recipe confirmation page

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