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Machine Learning
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NhatHoang
by • Valued Contributor II
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Resolved! Do One-Hot-Encoding (OHE) before or after split data to train and test dataframe

Hi,I wonder that I should do OHE before or after I split data to build up a ML model.Please give some advise.

Machine Learning
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  • 5937 Views
  • 3 replies
  • 15 kudos
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LandanG
Databricks Employee
  • 15 kudos

Hi @Nhat Hoang​ ,While not Databricks-specific, here's a good answer:"If you perform the encoding before the split, it will lead to data leakage (train-test contamination). In this sense, you will introduce new data (integers of Label Encoders) and u...

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