Random seed is ignored in input_fn

As a solution we set the seed manually to 0 in image augmentation.

The following discussion from !57 (merged) should be addressed:

• @tiago.pereira started a discussion: (+1 comment)

  Well, I don't know what is going on here. It seems that the pseudo-random number generator from the model_fn and the input_fn are different.

  Shall we open another issue for this and move one?

  I will try to isolate the code and see if this is our problem or TF problem