Fix Inception model to match Tensorflow's FID Inception model #16
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This change adapts the weights used by the model to the ones in the
original Tensorflow implementation. The Inception weights available in
torchvision do not correspond to the ones used by Tensorflow's FID.
Furthermore, some subtle differences in the model implementation were
changed to now match the Tensorflow implementation.
Overall, I now verified that the two models give exactly the same results when inputting exactly the same input image. This leaves different image loaders and interpolation algorithms as a possible source of introducing error. I also have not tested how the behavior on GPU is.