Predicting car prices with Kfold cross validation

Hello everyone!

I have completed a guided project related to car prices prediction using k-neighbors regressor.

Link to the screen: Learn data science with Python and R projects

In my case the rmse error arose significantly when I used Kfold cross validation, I added my explanation why it can happen in the notebook. Do you think it can be a case or I made a mistake somewhere in the code/implementation since it is my first experience programming that kind of stuff? In addition, other feedback regarding the project is highly appreciated.

Thanks in advance! Peace.

Notebook: Predicting Car Prices.ipynb (657.9 KB)

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