PR: Read JPEG images directly

[andfoy]

No description provided.

[codecov]

Codecov Report

Merging #2388 into master will increase coverage by 1.10%.
The diff coverage is 73.33%.

@@            Coverage Diff             @@
##           master    #2388      +/-   ##
==========================================
+ Coverage   70.68%   71.79%   +1.10%     
==========================================
  Files          94       94              
  Lines        7905     8254     +349     
  Branches     1245     1371     +126     
==========================================
+ Hits         5588     5926     +338     
+ Misses       1932     1931       -1     
- Partials      385      397      +12     

Impacted Files	Coverage Δ
torchvision/io/__init__.py	100.00% <ø> (ø)
torchvision/io/image.py	71.73% <73.33%> (+0.77%)	⬆️
torchvision/transforms/functional.py	83.18% <0.00%> (+2.26%)	⬆️
torchvision/transforms/transforms.py	83.02% <0.00%> (+6.98%)	⬆️

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[fmassa]

Thanks a lot for the PR!

I think this is good to merge, I only have a couple of comments (tests and .accessor.

Also, I wonder if we could in a follow-up PR maybe look into some small optimizations / improvements that I pointed out?

[fmassa]

for a next PR: it would be great if there was a way of avoiding having those globals.

[fmassa]

Thanks a lot!