Guidance around NLU Model Size

[nilimadesai]

As of NLU's September 2021 service update and as detailed in KB0953693, customers can use below guidance when building an NLU Model:    

• A model needs to have at least 2 intents with 5 utterances each 
• The number of utterances per intent is at least 15 and there is a limit of 200 utterances per intent 
• We currently support up to 300 intents or 4500 total utterances (whichever comes first) per NLU model 

Note: a previous limitation of 200 char and 25 words per utterance during prediction has been relaxed as of September 2021 NLU update. While this does not address scenarios where the user has typed a very long text with multiple intents, it removes the hard limitation. 

In general, it is recommended to leverage Virtual Agent's search capabilities to satisfy non-workflow related requests as much as possible. This helps to keep the number of intents within the model at check. The latest AI Search feature which is available as of Quebec release greatly helps in eliminating the need for having topics and intents that can otherwise be satisfied by knowledge articles, catalog items, and other search content.