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Interpolation refactoring

Stephan Seitz requested to merge seitz/pystencils:interpolation-refactoring into master

This is among other small things a refactoring of the interpolation

  • Make textures less special (now subclasses of interpolator)
  • Remove TextureCache
  • (Ab-) use finite differences to enable spatial derivatives of interpolators
  • enable code to use https://github.com/theHamsta/CubicInterpolationCUDA (not included into pystencils, not even as a submodule)

I can use it to transform Lenna and get gradients with Torch wrt. to image content, x-translation, y-translation Screenshot_20200115_182600

Also a nice image lenna transformed

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