Mrbean/codegen onnx

[sam-h-bean]

What does this PR do?

Codegen was added with an ONNX config but not with the model added to the features manager so trying to actually export an ONNX config is failing.

11497 ± RUN_SLOW=1 pytest tests/onnx/test_onnx_v2.py -k "codegen" -v
===================================================================================== test session starts ======================================================================================
platform darwin -- Python 3.9.10, pytest-7.1.2, pluggy-1.0.0 -- /Users/marklar/workspace/transformers/venv/bin/python3
cachedir: .pytest_cache
hypothesis profile 'default' -> database=DirectoryBasedExampleDatabase('/Users/marklar/workspace/transformers/.hypothesis/examples')
rootdir: /Users/marklar/workspace/transformers, configfile: setup.cfg
plugins: xdist-2.5.0, forked-1.4.0, timeout-2.1.0, hypothesis-6.47.0, dash-2.5.0
collected 371 items / 367 deselected / 4 selected                                                                                                                                              

tests/onnx/test_onnx_v2.py::OnnxExportTestCaseV2::test_pytorch_export_029_codegen_causal_lm PASSED                                                                                       [ 25%]
tests/onnx/test_onnx_v2.py::OnnxExportTestCaseV2::test_pytorch_export_030_codegen_default PASSED                                                                                         [ 50%]
tests/onnx/test_onnx_v2.py::OnnxExportTestCaseV2::test_pytorch_export_on_cuda_029_codegen_causal_lm PASSED                                                                               [ 75%]
tests/onnx/test_onnx_v2.py::OnnxExportTestCaseV2::test_pytorch_export_on_cuda_030_codegen_default PASSED                                                                                 [100%]

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• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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@patil-suraj @JingyaHuang

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[eshaanpathak]

small detail but this line should be in between camembert and convbert similar to how it is in the src/transformers/onnx/features.py file

[NouamaneTazi]

I think that this line should go to PYTORCH_EXPORT_WITH_PAST_MODELS with gpt2 and gpt-neo. Since it's a OnnxConfigWithPast config
@sam-h-bean

[JingyaHuang]

Thanks for noticing @NouamaneTazi, to make the test more organised, it would be better to place it in with_past model list.

[JingyaHuang]

Looks good to me, thanks for adding the feature!

[sgugger]

LGTM, @lewtun you can merge if you're happy with the changes.

Thanks for the fix!

[lewtun]

Thanks a lot for the fix and checking the slow tests pass @sam-h-bean 🚀 !!

This LGTM, so will go ahead with the merge