same situation of  standard_norm_pdf.
Let me know your suggestion so that I can make the change and continue to work on implementing the KL method.
BTW, it turns out I will implement the KL-method of Nickisch and Rasmussen 2008 for GPs using the piecewise bound provided by Emti during this week and next week, although I think this is beyond the entrance task.
Do u have any suggestion about my plan?