fix: replace torch.functional import with preferred torch.nn.functional

[vinayaksodar]

Fixes #3755

Description

replace invalid torch.functional import with torch.nn.functionalv

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

cc @zou3519 @albanD @jbschlosser

[pytorch-bot]

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[zou3519]

@svekars is there CI on this? I would have expected that we caught this before. If the answer is that there is no CI on this, then I would check this out locally and see if it actually runs. NB: I'm going to be sporadic for a couple of days

[zou3519]

if it works both ways then nn.functional as F is preferred