Using YOLOv5 with Pillow-SIMD

[glenn-jocher]

Discussed in #7472

^{Originally posted by jkocherhans April 18, 2022}
Hello! I’d like to use Pillow-SIMD (a drop-in replacement for Pillow) along with YOLOv5, but as soon as I import my model with torch.hub.load, check_requirements notices that Pillow isn’t installed and installs it automatically over the top of Pillow-SIMD. I can think of a few possible ways around this, but they all involve changing YOLOv5’s code.

1. Stop installing dependencies and print out a warning instead. Basically this would change the install=True default in check_requirements to False. In a production environment, it’s surprising to me that importing code would cause a package to be installed, but I definitely see how the current behavior is helpful for most folks.
2. Allow users to pass install=False into torch.hub.load, and pass that down to the call to check_requirements.
3. Special case check_requirements to check for Pillow-SIMD as a fallback for Pillow.

If any combination of those options sound like a good idea to the maintainers, I’m happy to put together a PR.

Thank you!

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