Import Error: cannot import name 'Mapping' from 'collections'

[dobrik4ever]

🐛 Bug

On python 3.10.4 got a following error:

To Reproduce

Python 3.10.4 | packaged by conda-forge | (main, Mar 30 2022, 08:38:02) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import pytorch_lightning as pl
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\ProgramData\Anaconda3\envs\dl\lib\site-packages\pytorch_lightning\__init__.py", line 53, in <module>    
    from pytorch_lightning.core import LightningModule, data_loader
  File "C:\ProgramData\Anaconda3\envs\dl\lib\site-packages\pytorch_lightning\core\__init__.py", line 339, in <module>
    from pytorch_lightning.core.decorators import data_loader
  File "C:\ProgramData\Anaconda3\envs\dl\lib\site-packages\pytorch_lightning\core\decorators.py", line 6, in <module>
    from pytorch_lightning.core.lightning import LightningModule
  File "C:\ProgramData\Anaconda3\envs\dl\lib\site-packages\pytorch_lightning\core\lightning.py", line 19, in <module>
    from pytorch_lightning.core.hooks import ModelHooks
  File "C:\ProgramData\Anaconda3\envs\dl\lib\site-packages\pytorch_lightning\core\hooks.py", line 7, in <module>   
    from pytorch_lightning.utilities import move_data_to_device, NATIVE_AMP_AVALAIBLE
  File "C:\ProgramData\Anaconda3\envs\dl\lib\site-packages\pytorch_lightning\utilities\__init__.py", line 7, in <module>
    from pytorch_lightning.utilities.apply_func import move_data_to_device
  File "C:\ProgramData\Anaconda3\envs\dl\lib\site-packages\pytorch_lightning\utilities\apply_func.py", line 2, in <module>
    from collections import Mapping, Sequence
ImportError: cannot import name 'Mapping' from 'collections' (C:\ProgramData\Anaconda3\envs\dl\lib\collections\__init__.py)

Expected behavior

When importing pl the ImportError raised

• PyTorch Lightning Version: 0.8.5
• Python version: 3.10.4
• OS: Windows 10

[akihironitta]

@dobrik4ever The version of PyTorch Lightning you're using seems very old. Would you mind updating to the stable release by running pip install pytorch-lightning -U and trying it again? Let me know if it resolves this issue.

Please note that, as of now, we are not testing PyTorch Lightning with Python 3.10, but if the problem still persists, it'll be addressed via #9980.

[awaelchli]

We no longer have this import statement in the code base. It was changed in #2746 so this should be resolved. As @akihironitta said, the solution is to update lightning to a recent version or to downgrade Python to an older version. I don't see any direct relationship to Python 3.10 incompatibility otherwise.