text: Title: Training with various input sizes?
  Body: I have various photographs of different sizes that I am trying to train and I keep getting errors similar to `RuntimeError: invalid argument 0: Sizes of tensors must match except in dimension 1. Got 16 and 17 in dimension 3`
  
  I've tried setting `--preprocess` to either `none` or `scale_width` and I have tried setting the `batch_size` to 1. Is it possible to input images of different rectangular sizes for training and testing?