3D image rotation Ref. Figure 5-12, p. 165 (add %matplotlib notebook)

Chapter 5 Support Vector Machins has a 3D Figure 5-12 on page 165 (2nd Ed.).
Matplotlib allows rotation of 3D figures with the mouse, however, this functionality is only available if the cell creating the surface includes a line
%matplotlib notebook
Ref:
https://stackoverflow.com/questions/33436221/displaying-rotatable-3d-plots-in-ipython-or-jupyter-notebook