openml / openml/openml.org

Downloads fetching incomplete files without reporting failure

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Dominant language
TypeScript
Stars
33
Forks
30
Avg merge
2d 21h
Merged PRs (30d)
6

Description

Some datasets, particularly this one:
https://openml.org/data/v1/download/16797613/CIFAR_10.arff

Have lately been yielding incomplete files when downloading them, whether through a web browser or through API using scikit-learn's fetch_openml.

For example, back a few months ago, this dataset was yielding a 600mb+ file like this:
Image

But if I download the same dataset through a web browser today, I get files of different sizes:
Image
Image

The download reports completing successfully on both web browsers and scikit-learn's fetch_openml, despite not fetching the full file.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the download from the linked OpenML URL and through scikit-learn's fetch_openml, then trace the download endpoint in the TypeScript application. Check how response completion and file size are validated; done means incomplete downloads are detected and reported as failures rather than successful fetches.

Written by the indexing model from the issue text.

Assessment

Tech stack
python, typescript
Domain
api, backend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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