# How to chose Tracker Featurizers

**URL:** <https://forum.rasa.com/t/how-to-chose-tracker-featurizers/2635>\
**Category:** Rasa Open Source\
**Created:** [November 13, 2018, 3:24pm UTC](https://forum.rasa.com/t/how-to-chose-tracker-featurizers/2635 "2018-11-13T15:24:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![eef](https://avatars.discourse-cdn.com/v4/letter/e/c2a13f/32.png) [@eef](https://forum.rasa.com/u/eef)\
**Post date:** [November 13, 2018, 3:24pm UTC](https://forum.rasa.com/t/how-to-chose-tracker-featurizers/2635/1 "2018-11-13T15:24:57Z")

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Hi,

I saw on the [documentation page about Featurizer](https://www.rasa.com/docs/core/api/featurizer/) that two featurizers exist :

1. FullDialogueTrackerFeaturizer
2. MaxHistoryTrackerFeaturizer

I have two questions :

- Which one is the default one ?
- How to change the Rasa Core configuration to select one of them ?

Thanks !