`norm()` -> `linalg.norm()` in `lennard_jones` (#1898)
Summary:
`torch.norm()` is deprecated, so this PR updates `lennard_jones` model to use `torch.linalg.norm()` instead
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1898
Reviewed By: msaroufim
Differential Revision: D49285603
Pulled By: xuzhao9
fbshipit-source-id: 476932958b19513e3f486358092ad0d616e4ab48
