We also have to convert SymPy matrices to NumPy arrays prior to plotting. Therefore, we prefer to define vectors as NumPy arrays if we intend to just plot them. However, if we want to apply ...

Below code, when trax is dataframe, xgb.plot_importance will show feature name, but trax is np.array it will show f1, f2, f3... It is not convenience, could add a parameter in xgb.plot_importance c ...