LPIPS metric. pip install lpips
https://pypi.org/project/lpips/0.1.4/ Fixed return all layers bug: https://github.com/richzhang/PerceptualSimilarity/blob/master/lpips/lpips.py#L137
https://pypi.org/project/lpips/0.1.3/
Removed from IPython import embed
statements
Versioning this before merging in refactoring