[BUGFIX] Fix numpy pad operator

[barry-jin]

Description

Fix issue #19777

Checklist

Essentials

• PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage
• Code is well-documented

Changes

• Broadcast pad_width to (ndim, 2).

Comments

• If this change is a backward incompatible change, why must this change be made.
• Interesting edge cases to note here

[mxnet-bot]

Hey @barry-jin , Thanks for submitting the PR
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[barry-jin]

@mxnet-bot run ci [miscellaneous, windows-gpu]

[mxnet-bot]

Jenkins CI successfully triggered : [windows-gpu, miscellaneous]

[barry-jin]

@mxnet-bot run ci [miscellaneous, windows-gpu]

[mxnet-bot]

Jenkins CI successfully triggered : [miscellaneous, windows-gpu]

[szha]

@josephevans any idea about the docker build failure in the misc pipeline?

[leezu]

It's a legacy container build and I don't think anyone is maintaining it. It's failing now because Ubuntu 16.04 is no longer supported and it is based on 16.04. I'm not even sure it's still used, so I suggest to delete it to unblock the current PR #19801

[barry-jin]

@mxnet-bot run ci [windows-gpu]

[mxnet-bot]

Jenkins CI successfully triggered : [windows-gpu]

[szha]

@barry-jin thanks for the fix!