A tiny python module for Quaternions. ... using a 4D array representing the elements of a quaternion q=[w,x,y,z]. Define the array using numpy's ndarray. q = Quaternion ... To perform this test, we ...

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 call ...