emmanuel

Could you please explain why you would want a positive logdet? I don't see why you would want this, negative nll can very well be positive in the case where...

the logdet has no reason to be positive ... depends if the function is contractive or expanding

I now use pytorch's official STN implementation! https://github.com/pytorch/pytorch/blob/master/torch/nn/_functions/vision.py

You are right again ! Don't hesitate if you want to send in a PR to correct this. Cheers