fix _reset_eval_dataloader() for IterableDataset #1560

ybrovman · 2020-04-22T15:26:52Z

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What does this PR do?

I encountered the following error TypeError: object of type 'MyIterableDataset' has no len() from line 190 in _reset_eval_dataloader() in data_loading.py file when using an IterableDataset for the validation dataset.

The if dl caused the issue. if dl is equivalent to bool(dl) = dataloader.__bool__, but there is no dataloader.__bool__ so bool() uses dataloader.__len__ > 0. But... dataloader.__len__ uses IterableDataset.__len__ for IterableDatasets for which __len__ is undefined.

Resolving the issue by comparing to None, if dl is not None, in _reset_eval_dataloader().

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pytorch_lightning/trainer/data_loading.py

pep8speaks · 2020-04-23T00:00:46Z

Hello @ybrovman! Thanks for updating this PR.

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2020-05-05 15:48:37 UTC

awaelchli

Good catch, but I don't understand why the test test_inf_val_dataloader passes if this bug exists. How do I reproduce this actually? The description of this PR makes it look like this should fail with any IterableDataset, but I don't get this error.

ybrovman · 2020-04-27T18:57:21Z

Good catch, but I don't understand why the test test_inf_val_dataloader passes if this bug exists. How do I reproduce this actually? The description of this PR makes it look like this should fail with any IterableDataset, but I don't get this error.

I am not too familiar with the testing details here, however, I think the issue might be with the CustomInfDataloader. Perhaps since if dl = bool(dl) and CustomInfDataloader.__bool__ or CustomInfDataloader.__len__ does not exist, bool(CustomInfDataloader) is always True, so the test_inf_val_dataloader passes.

Borda

LGTM 🤖

Borda · 2020-05-05T15:33:26Z

@ybrovman mind add a test for this iter dataset?

codecov · 2020-05-05T16:04:09Z

Codecov Report

Merging #1560 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1560   +/-   ##
======================================
  Coverage      88%     88%           
======================================
  Files          69      69           
  Lines        4151    4151           
======================================
  Hits         3661    3661           
  Misses        490     490

awaelchli

In which case is dl actually None? Have you considered removing the if statement completely?

ybrovman · 2020-05-05T17:51:27Z

In which case is dl actually None? Have you considered removing the if statement completely?

@awaelchli I did remove the if statement in the original commit, however, added back the None check after @tullie 's comment.

tullie · 2020-05-05T18:07:26Z

I tried to look at cases where it could be None and it's hard to track down exactly. However, i'm fairly sure it's only None if the val_dataloader or test_dataloader returns None.

Borda · 2020-05-05T18:58:49Z

I tried to look at cases where it could be None and it's hard to track down exactly. However, i'm fairly sure it's only None if the val_dataloader or test_dataloader returns None.

shall we raise a warning if any dataloader is none or just skip it...

tullie · 2020-05-05T20:52:45Z

Yeah ideally we should raise a warning but not the biggest issue.

Borda · 2020-05-05T21:11:21Z

Yeah ideally we should raise a warning but not the biggest issue.

so just a warning to logging or standard Runtime warning... and just once and then remove the None dataloader from the list

@ybrovman mind send a followup PR?

ybrovman · 2020-05-05T23:34:34Z

@Borda I created PR #1745 to address your comment.

This function has the if statement `if (train_dataloader or val_dataloaders) and datamodule:`. The issue is similar to that in Lightning-AI#1560. The problem is that the `if(dl)` translates to `if(bool(dl))`, but there's no dataloader.__bool__ so bool() uses dataloader.__len__ > 0. But... dataloader.__len__ uses IterableDataset.__len__ for IterableDatasets for which __len__ is undefined. The fix is also the same, the `if dl` should be replaced by `if dl is not None`.

…2957) This function has the if statement `if (train_dataloader or val_dataloaders) and datamodule:`. The issue is similar to that in #1560. The problem is that the `if(dl)` translates to `if(bool(dl))`, but there's no dataloader.__bool__ so bool() uses dataloader.__len__ > 0. But... dataloader.__len__ uses IterableDataset.__len__ for IterableDatasets for which __len__ is undefined. The fix is also the same, the `if dl` should be replaced by `if dl is not None`. Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

…ightning-AI#2957) This function has the if statement `if (train_dataloader or val_dataloaders) and datamodule:`. The issue is similar to that in Lightning-AI#1560. The problem is that the `if(dl)` translates to `if(bool(dl))`, but there's no dataloader.__bool__ so bool() uses dataloader.__len__ > 0. But... dataloader.__len__ uses IterableDataset.__len__ for IterableDatasets for which __len__ is undefined. The fix is also the same, the `if dl` should be replaced by `if dl is not None`. Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

mergify bot requested a review from a team April 22, 2020 15:27

Borda assigned tullie Apr 22, 2020

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Borda added the bug Something isn't working label Apr 23, 2020

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Borda requested review from Borda, awaelchli and justusschock May 4, 2020 21:08

awaelchli mentioned this pull request May 5, 2020

IterableDataset does not work in validation #1731

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awaelchli linked an issue May 5, 2020 that may be closed by this pull request

IterableDataset does not work in validation #1731

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ybrovman added 2 commits May 5, 2020 17:48

removed if dl from _reset_eval_dataloader()

da7045b

changed to if dl != None to be more safe

b5ff528

hints from pep8speaks

6e805a0

Borda force-pushed the dataloader branch from b03a4a1 to 6e805a0 Compare May 5, 2020 15:48

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williamFalcon merged commit 35bbe17 into Lightning-AI:master May 5, 2020

ybrovman mentioned this pull request May 5, 2020

added warning for None dataloader #1745

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SiddhantRanade mentioned this pull request Aug 13, 2020

Using IterableDatasets without __len__ for Training #2955

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SiddhantRanade mentioned this pull request Aug 13, 2020

Fix enforce_datamodule_dataloader_override() for iterable datasets #2957

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fix _reset_eval_dataloader() for IterableDataset #1560

fix _reset_eval_dataloader() for IterableDataset #1560

ybrovman commented Apr 22, 2020 •

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fix _reset_eval_dataloader() for IterableDataset #1560

fix _reset_eval_dataloader() for IterableDataset #1560

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ybrovman commented Apr 22, 2020 • edited Loading

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