Fig. 21

Comparison of actual vs. predicted hardness using machine learning models: (a) linear regression; (b) support vector regression (SVR); (c) random forest; (d) gradient boosting; (e) XG-Boost.

Comparison of actual vs. predicted hardness using machine learning models: (a) linear regression; (b) support vector regression (SVR); (c) random forest; (d) gradient boosting; (e) XG-Boost.