Update L1-norm logic for foreseeable PyTorch update

[namgyu-youn]

What does this PR do?

Type of change: Refactor

Overview: Based on PyTorch - docs, torch.norm() will be removed in the foreseeable version. Therefore, this update replaces torch.norm() with torch.linalg.vector_norm()

Usage

# Old (current) version
torch.norm()

# New (updated) version
torch.linalg.vector_norm()

Testing

Not planned

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• Is this change backward compatible?: Yes
• Did you write any new necessary tests?: Yes
• Did you add or update any necessary documentation?: No
• Did you update Changelog?: No

Additional Information

[namgyu-youn]

cc. @kevalmorabia97 @meenchen