Thank you for the implementation. How to handle if we have categorical data or mixed data in our dataset?

Hello
I was testing the code, a first view works fine. But then I realized that the testing rmse calculates it based on the difference of the normalized values. So since the values ​​are small, the sum of differences of small things gives a small sum.
I modified the code so that it calculates it with the real values ​​(denormalized) and the rmse gives me quite a bad result.