**Q31. Assume that I standardized my data, my question is, at what point of time should we re-scale standardized values to normal?**

**Is it after model completes its learning (i.e. after invocation of .fit(****X_train, y_train****)) ?**

** (or)**

**Is it after predicting values from the standardized data (i.e. after invocation of .pred(X_test)) ?**

** (or)**

**Is it after calculating RMSE with X_test & y_pred_test ?**

We need to do an inverse transformation after predicting the X_test.

Do inverse transformation on both y_preds and y_test and then you can calculate RMSE.

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