Add documentation for ImageNet dataset

[pmeier]

No description provided.

[codecov-io]

Codecov Report

Merging #859 into master will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #859     +/-   ##
=========================================
- Coverage   54.49%   54.39%   -0.1%     
=========================================
  Files          36       36             
  Lines        3307     3307             
  Branches      542      542             
=========================================
- Hits         1802     1799      -3     
- Misses       1372     1374      +2     
- Partials      133      134      +1

Impacted Files	Coverage Δ
torchvision/transforms/transforms.py	82% <0%> (-0.69%)	⬇️

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[soumith]

thanks!