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UserWarning: Your validation_step returned None is issued when using DDP #6137

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dpieczynski opened this issue Feb 22, 2021 · 0 comments · Fixed by #6139
Closed

UserWarning: Your validation_step returned None is issued when using DDP #6137

dpieczynski opened this issue Feb 22, 2021 · 0 comments · Fixed by #6139
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@rohitgr7
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@dpieczynski
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🐛 Bug

When using DDP with the validation_step function that doesn't return anything the following warning is printed (Lightning 1.2.0):

pytorch_lightning/utilities/distributed.py:50: UserWarning: Your validation_step returned None. Did you forget to return an output?

This doesn't seem right, as documentation, as far as I'm aware, never mentions a need for doing so.

To Reproduce

Run .fit(...) on a Trainer created with accelerator='ddp'.

Environment

  • PyTorch Version (e.g., 1.0): 1.7.1
  • OS (e.g., Linux): Linux
  • How you installed PyTorch (conda, pip, source): pip
  • Python version: 3.8.6
@dpieczynski dpieczynski added bug Something isn't working help wanted Open to be worked on labels Feb 22, 2021
@rohitgr7 rohitgr7 mentioned this issue Feb 22, 2021
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Remove no return warning from val/test step Lightning-AI/pytorch-lightning
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@dpieczynski @rohitgr7