Unable to import pytorch_lightning on google colab

Question

I have done the following:

!pip install pytorch_lightning -qqq
import pytorch_lightning

But get the following error:

ImportError                               Traceback (most recent call last)
<ipython-input-7-d883b15aac58> in <module>()
----> 1 import pytorch_lightning

----------------------------------9 frames------------------------------------------------
/usr/local/lib/python3.7/dist-packages/pytorch_lightning/utilities/apply_func.py in <module>()
     26 
     27 if _TORCHTEXT_AVAILABLE:
---> 28     from torchtext.data import Batch
     29 else:
     30     Batch = type(None)

ImportError: cannot import name 'Batch' from 'torchtext.data' (/usr/local/lib/python3.7/dist-packages/torchtext/data/__init__.py)

What could the issue be?

Answer 1

As said in Issue #6415 on Github, try installing from the GitHub.
It worked for me.

!pip install git+https://github.com/PyTorchLightning/pytorch-lightning
import pytorch_lightning as pl
print(pl.__version__)

Output:

1.3.0dev

It seems that the error is coming from Issue #6210 and they say it was fixed. I guess it wasn't uploaded to PyPi.

Answer 2

Example working env: https://colab.research.google.com/drive/1GSCd3Gz3EOQIln3v065VKWKbB3_F8xqK?usp=sharing

Can you try after restarting your env.

!pip install torchtext==0.8.0 torch==1.7.1 pytorch-lightning==1.2.2

import pytorch_lightning as pl
print(pl.__version__)
...

There appears to be a bug that has not hit pip yet with pytorch lightning not referencing the newest torchtext.

Answer 3

You can try this command, I encountered the same problem and was able to fix the problem.

!pip install --upgrade pytorch-lightning