Functional to_tensor returns float tensor of default dtype

[vfdev-5]

Fixes #3393

Description:

• Functional to_tensor returns float tensor of default dtype

[datumbox]

The changes look good to me.

Does it make sense to also change the following?

vision/torchvision/transforms/_functional_video.py

Line 72 in fcf494f

return clip.float().permute(3, 0, 1, 2) / 255.0

[codecov]

Codecov Report

Merging #3398 (fcf494f) into master (f04e9cb) will increase coverage by 0.00%.
The diff coverage is 75.00%.

@@           Coverage Diff           @@
##           master    #3398   +/-   ##
=======================================
  Coverage   74.82%   74.82%           
=======================================
  Files         105      105           
  Lines        9719     9720    +1     
  Branches     1562     1562           
=======================================
+ Hits         7272     7273    +1     
  Misses       1960     1960           
  Partials      487      487           

Impacted Files	Coverage Δ
torchvision/transforms/functional.py	81.77% <75.00%> (+0.04%)	⬆️

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[vfdev-5]

Does it make sense to also change the following?
vision/torchvision/transforms/_functional_video.py

I think this private API to be removed ?