the original resources of the GP features sensitivity analysis

Hi, I am interested in the GP sensitivity analysis implemented in CatLearn and want to know the original formula of this method. https://github.com/SUNCAT-Center/CatLearn/blob/master/catlearn/regression/gpfunctions/sensitivity.py
Does it similar with the method described in https://munin.uit.no/bitstream/handle/10037/6784/thesis.pdf?sequence=2.  
Thank you very much.