Fix torchtext data to gpu

[jungwhank]

What does this PR do?

Fixes #4782

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[awaelchli]

Note: #3529

[tchaton]

Great catch !

[codecov]

Codecov Report

Merging #4785 (f8fb92d) into master (7d96fd1) will decrease coverage by 0%.
The diff coverage is 67%.

@@          Coverage Diff           @@
##           master   #4785   +/-   ##
======================================
- Coverage      93%     93%   -0%     
======================================
  Files         118     118           
  Lines        9030    9032    +2     
======================================
+ Hits         8403    8404    +1     
- Misses        627     628    +1