fix importing torchtext batch

[Borda]

What does this PR do?

we need to reduce dependency, but still, we want to give full credit to torchtext
also as it was moved to legacy, it seems to be on a deprecation curve and we need it...
Resolves #6362
Already discussed and pre-agreed with @SeanNaren and @tchaton

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[pep8speaks]

Hello @Borda! Thanks for updating this PR.

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2021-03-05 19:43:54 UTC

[codecov]

Codecov Report

Merging #6365 (19de065) into master (e848542) will decrease coverage by 2%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #6365    +/-   ##
=======================================
- Coverage      93%     91%    -2%     
=======================================
  Files         161     161            
  Lines       11457   11347   -110     
=======================================
- Hits        10692   10372   -320     
- Misses        765     975   +210