Update CopySlices to not internal assert when grad_output is undefined

[soulitzer]

Stack from ghstack (oldest at bottom):

• -> Update CopySlices to not internal assert when grad_output is undefined #108353
• Fix inference_mode decorator pass mode as kwarg #107349
• Improve activation checkpoint docs wording #107296

Fixes #107928

cc @ezyang @albanD @zou3519 @gqchen @pearu @nikitaved @lezcano @Varal7

[pytorch-bot]

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❗ 1 Merge Blocking SEVs

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• (merge blocking) Networking issue preventing multiple CI jobs to access GH API

If you must merge, use @pytorchbot merge -f.

❌ 1 New Failure, 1 Unrelated Failure

As of commit 249b01b with merge base 2c87ef3 ():

NEW FAILURE - The following job has failed:

• linux-focal-rocm5.6-py3.8 / test (default, 1, 3, linux.rocm.gpu) (gh)

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• linux-focal-rocm5.6-py3.8 / test (default, 2, 3, linux.rocm.gpu) (gh)

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[albanD]

Thanks!

[soulitzer]

@pytorchbot merge

[pytorchmergebot]

Merge failed

Reason: Not merging any PRs at the moment because there is a merge blocking https://github.com/pytorch/pytorch/labels/ci:%20sev issue open at:
#108524

Details for Dev Infra team

Raised by workflow job

[soulitzer]

@pytorchbot merge

[pytorchmergebot]

Merge failed

Reason: Not merging any PRs at the moment because there is a merge blocking https://github.com/pytorch/pytorch/labels/ci:%20sev issue open at:
#108524

Details for Dev Infra team

Raised by workflow job

[soulitzer]

@pytorchbot merge -f "Unrelated failures"

[pytorchmergebot]

Merge started

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