Imbalanced data - testing

Hi. My dependent variable is imbalanced so I am doing an oversampling of the minority class. I will train my model on an oversampled training set. Do I test the model on the imbaanced data or the balanced data? Why

I say both.
because if you dont look at the imbalanced data, then you cant say anything about your models performance.
if you dont look at the balanced data you won't as easily diagnose problems if they crop up in the imbalanced data.

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