Problem with Bilinear Interpolation

[jenabbhatia]

Hello, I have tried your code for an image of size 48*48, i want to use the _transform function whose definition is like: _transform(self,X,affine_transformation,output_size) of class Bi-linear interpolation but i am not getting what should be the value of affine_transformation, as in the code of STN.py file Bilinear interpolation is just initialized i was unable to find the _transform function call. Please help me to understand the code.