You all apply them before to use any machine learning algorithm. They are preprocessing methods. 

Sent from my phone - sorry to be brief and potential misspell.

From: hemanth.ge...@gmail.com
Sent: 8 October 2019 14:49
To: scikit-learn@python.org
Reply to: scikit-learn@python.org
Subject: [scikit-learn] Regarding design decision for putting Data Scaler and Feature Transformers under same module

Hi Team, 

I'm beginner in using sklearn library. I have doubt regarding reason for putting Data scalers like StandardScaler, RobustScaler etc and feature transformers like QuantileTransformer, PolynomialFeatures in preprocessing module ? What relationship made to put them together?

Thanks 
Hemanth 

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