Newer torchtext (>= nightly 2021-02-19) breaks PyTorch Lightning

[thiagocrepaldi]

🐛 Bug

import pytorch_lightning as pl
  File "/../python3.7/site-packages/pytorch_lightning/utilities/apply_func.py", line 28, in <module>
    from torchtext.data import Batch
ImportError: cannot import name 'Batch' from 'torchtext.data' (/.../python3.7/site-packages/torchtext/data/__init__.py)

To Reproduce

Install nightly torchtext after 02/19/2021 and install pytorch Lightning and try to import lightning on python interpreter

Expected behavior

Latest pytorch lightning should be compatible with nightly torchtext or at lest a nightly ightning should be made available with such fix

[soyoung97]

For my case, torchtext version of 0.9.0 got this issue, so downgrading to pip install torchtext==0.8.1 solved the version conflict.