# Some questions about lookup table in NLU

**URL:** <https://forum.rasa.com/t/some-questions-about-lookup-table-in-nlu/33331>\
**Category:** Rasa Open Source\
**Created:** [September 3, 2020, 8:15am UTC](https://forum.rasa.com/t/some-questions-about-lookup-table-in-nlu/33331 "2020-09-03T08:15:05Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![TristanAppDev](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.rasa.com/tristanappdev/32/10645_2.png) [@TristanAppDev](https://forum.rasa.com/u/TristanAppDev)\
**Post date:** [September 3, 2020, 10:11am UTC](https://forum.rasa.com/t/some-questions-about-lookup-table-in-nlu/33331/2 "2020-09-03T10:11:13Z")

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Hey there,

maybe these two links can help you clarify some questions:

[NLU Training Data Format](https://rasa.com/docs/rasa/nlu/training-data-format/#id10)

[10 Best Practices for Designing NLU Training Data](https://blog.rasa.com/10-best-practices-for-designing-nlu-training-data/)

Question 1: According to my first link huge and noisy lookup tables can hurt performance.

Question 2: I don’t think there is a total number for how many lookup table entries should be in your training data examples. I think it’s always good practice to have a balanced amount of examples.

I hope this helps you a little bit.

Regards, Tristan

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