Replaced deprecated scipy and torch functions.

[victor-psiori]

Thanks for the wonderful paper and repo. I have done following minor changes:

• minor formatting and cleaning up while reading through the code.
• formatting with python black formatter.
• replaced deprecated scipy resize function with cv resize api.
• replaced torch Variable instances with torch Tensor since Variable is no longer maintained by PyTorch.
• Scipy fixing was required to get the jupyter example notebook running.

Thanks again, victor