Pass kwargs from make_private to _prepare_optimizer

[eigengravy]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Docs change / refactoring / dependency upgrade

Motivation and Context / Related issue

Pass kwargs from make_private to _prepare_optimizer to allow extra arguments to the optimizer.
Closes #559

How Has This Been Tested (if it applies)

Tested and confirmed the colab notebook in the attached issue works.

Checklist

• The documentation is up-to-date with the changes I made.
• I have read the CONTRIBUTING document and completed the CLA (see CONTRIBUTING).
• All tests passed, and additional code has been covered with new tests.

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[HuanyuZhang]

Thanks for contribution! Let me take a look and let you know.

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@HuanyuZhang has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@HuanyuZhang has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@HuanyuZhang merged this pull request in 3619619.