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Error on zero length dataloaders #1280

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SkafteNicki
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@SkafteNicki SkafteNicki commented Mar 29, 2020

Before submitting

  • Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
  • Did you read the contributor guideline, Pull Request section?
  • Did you make sure to update the docs?
  • Did you write any new necessary tests?
  • If you made a notable change (that affects users), did you update the CHANGELOG?

What does this PR do?

Fixes #1131.
Return a ValueError if user specified dataloaders has zero length (no batches). Current error returned are non-informative.

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Anyone in the community is free to review the PR once the tests have passed.
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Make sure you had fun coding 🙃

@ethanwharris
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This looks nice :) could you add a test to make sure that the error is raised?

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codecov bot commented Mar 29, 2020

Codecov Report

Merging #1280 into master will increase coverage by <1%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #1280    +/-   ##
=======================================
+ Coverage      92%     92%   +<1%     
=======================================
  Files          62      62            
  Lines        3188    3190     +2     
=======================================
+ Hits         2920    2922     +2     
  Misses        268     268

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@ethanwharris ethanwharris left a comment

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Awesome - LGTM :)

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mergify bot commented Mar 29, 2020

This pull request is now in conflict... :(

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@Borda Borda left a comment

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LGTM 🚀

pytorch_lightning/trainer/data_loading.py Outdated Show resolved Hide resolved
@Borda Borda added bug Something isn't working ready PRs ready to be merged labels Mar 30, 2020
@Borda Borda added this to the 0.7.2 milestone Mar 30, 2020
@Borda Borda requested a review from a team March 30, 2020 16:52
@williamFalcon williamFalcon merged commit 2ccc745 into Lightning-AI:master Mar 30, 2020
alexeykarnachev pushed a commit to alexeykarnachev/pytorch-lightning that referenced this pull request Apr 3, 2020
* error_on_zero_length

* update CHANGELOG.md

* added test

* Update pytorch_lightning/trainer/data_loading.py

Co-authored-by: Nicki Skafte <nugginea@gmail.com>
Co-authored-by: Jirka Borovec <Borda@users.noreply.github.com>
@SkafteNicki SkafteNicki deleted the error_on_zero_len_dataloader branch April 21, 2020 13:51
@Borda Borda modified the milestones: v0.7., v0.7.x Apr 18, 2021
@carmocca carmocca mentioned this pull request Feb 25, 2022
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Better message when DataLoader is wrong
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