Object detection pipeline

[mishig25]

What does this PR do?

• Object detection pipeline
• Give an image or list of images, outputs obj det annotations in form:

[
    [
        {'score': 0.9..., 'label': 'remote', 'box': [{'x': 66, 'y': 118}, ...},
    ],
    ...
]

• See colab for more details

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline,
  Pull Request section?
• Was this discussed/approved via a Github issue or the forum? Please add a link
  to it if that's the case. huggingface_hub#74
• Did you make sure to update the documentation with your changes? Here are the
  documentation guidelines, and
  here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.
@NielsRogge

[Narsil]

LGTM.

Thanks !

[mishig25]

@LysandreJik I think its ready to be merged. Please let me know if you there's anything else I need to take care of :)

[Narsil]

Hi @mishig25 ,

I think you need to fix all the tests.

import torch need to be protected behind is_torch_available for instance.
For code quality you can pip install -e .[dev] and then make fixup.
The PT tests also seem to require timm which are not available in the tests. So you need a @require_timm decorator.

[mishig25]

@Narsil I'm confused about the tf tests failing.
For example, in this failed test, I see the test failing for pipelines I haven't made any changes (also, I made sure my branch is up-to-date with the master):
here is an example for test_pipelines_translation
_____________ ERROR collecting tests/test_pipelines_translation.py _____________ImportError while importing test module '/home/circleci/transformers/tests/test_pipelines_translation.py'....E ModuleNotFoundError: No module named 'torch'
Please let me know what step I'm missing

[mishig25]

Since the PR was approved by two HF members and tests passed, I've merged it when the merge option became available. Please let me know if it is a correct procedure (i.e. should I have waited until a transfomers maintainer merged it?)

[sgugger]

That's correct: as long as you have approval of one core maintainer (more for big PRs), addressed all comments, and all tests pass, you can merge your PR. :-)