[Add Hyperparameter Tuning and the Usage of R2 Score as a Metric for Stock Price Prediction Models] <Usage of GridSearchCV/RandomSearchCV to find optimum model hyperparameters>

[Add Hyperparameter Tuning and the Usage of R2 Score as a Metric for Stock Price Prediction Models] <Usage of GridSearchCV/RandomSearchCV to find optimum model hyperparameters> #5