What is the use of **Memoization policy**?..and another , In a formfilling how is the bot knows what to ask next?

Rasa Open Source
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What is the use of Memoization policy??..and another , In a formfilling how is the bot knows what to ask next?

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You can read more about it in the docs and there’s a discussion in this blog post.

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@stephens…thanks…i have another question…i see that rasa nlu uses bag of words for finding the intent and CRF(conditional random field ) model or algorithm for extracting the entities…i guss its diet classfier that do that and holds these two algorithms if am not wrong…so for predicting next actions those policies what kind of algorithms or model they use to do those tasks like predicting next action or bots response?