Examples: can remove cross-validation from outlier detection

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
30/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Stale
Tech stack
jupyter-notebook

Research direction

Start with the outlier_detection_cifar10 example linked in the issue and inspect how its current train/test OOD settings use cross-validation. Add or evaluate the proposed training setting with outliers, compare whether cross-validation helps, and update the example based on that result.

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Description

good first issue help wanted

This example: https://github.com/cleanlab/examples/tree/master/outlier_detection_cifar10
could become much more straightforward without cross-validation now that we've seen it doesn't help too much in the train/test OOD settings.

But to truly assess the utility of cross-validation, we should first include an additional benchmark setting where we evaluate OOD detection on a training dataset with some outliers included (during training not just during testing). Cross-validation may still help in this setting.

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