Conda installer should enforce Pillow 4.0.0.

[benlundell]

Installing PyTorch and torchvision via conda forces a downgrade from Python 3.6.1 to Python 3.6.0. But using Pillow 4.1.0 with Python 3.6.0 causes an error, as Pillow 4.1.0 was built with Python 3.6.1. The offending bug is in Python, not PyTorch, torchvision, or Pillow. However, the conda installer could be updated to require Pillow 4.0.0 if it requires Python 3.6.0.

[soumith]

i see. The offending bug is indeed in python (which is why I had to require python 3.6.0 and rebuild my binaries.)

The next pytorch release this week, I'll make it explicitly require 3.6.1

[hugovk]

By the way, there's a new Pillow 4.1.1 release due out soon that works around the Python 3.6.0/1 bug, and should be installable on both.

Keep an eye on: python-pillow/Pillow#2492

[hugovk]

Pillow 4.1.1 is now out python-pillow/Pillow#2492 with a fix python-pillow/Pillow#2493 for python-pillow/Pillow#2479.

[benlundell]

@hugovk thanks for keeping tabs on this. @soumith has the release happened? If so, then I'll test and close. If not, it sounds like another option would be to require Pillow 4.1.1.

[soumith]

the release has happened yesterday for pytorch. i haven't cut a new release for torchvision itself, I can enforce pillow >= 4.1.1