Guided Project Predicting Bike Rentals with Linear Regression, Decision tress and Random forest

Hi guys
I just finished this project, it took me a while because i have some confusion on how to know if a model is overfit or underfit. Here in this project i found that some RMSE values tells me that the model is overffited but if i check the R2 Score then i found that they are not so if someone can explain to me a little bit more about it i would appreciate that

Thank you guys!

Predicting Bike Rentals.ipynb (373.1 KB)

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