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Summary:
The `examples/source_separation` scripts use inconsistent keyword to indicate the WSJ0_2mix dataset. This PR does the following.

1. Use `wsj0mix` consistently as keyword indicating the WSJ0_2mix dataset
2. Corrects `args.data_dir` to `args.root_dir` in eval.py
3. Modify the parameters of `pytorch_lightning.Trainer` according to latest version (use `accelerator="gpu"` and `devices=args.num_devices`, instead of just `gpus=args.num_devices`)

Pull Request resolved: https://github.com/pytorch/audio/pull/2987

Reviewed By: xiaohui-zhang

Differential Revision: D42536992

Pulled By: nateanl

fbshipit-source-id: 10a80263ad7054b1629d8fa023676b607e633d76

Summary:
Applies new import merging and sorting from µsort v1.0.

When merging imports, µsort will make a best-effort to move associated
comments to match merged elements, but there are known limitations due to
the diynamic nature of Python and developer tooling. These changes should
not produce any dangerous runtime changes, but may require touch-ups to
satisfy linters and other tooling.

Note that µsort uses case-insensitive, lexicographical sorting, which
results in a different ordering compared to isort. This provides a more
consistent sorting order, matching the case-insensitive order used when
sorting import statements by module name, and ensures that "frog", "FROG",
and "Frog" always sort next to each other.

For details on µsort's sorting and merging semantics, see the user guide:
https://usort.readthedocs.io/en/stable/guide.html#sorting

Reviewed By: lisroach

Differential Revision: D36402214

fbshipit-source-id: b641bfa9d46242188524d4ae2c44998922a62b4c

Summary:
Pull Request resolved: https://github.com/pytorch/audio/pull/2096

run: `arc lint --apply-patches --paths-cmd 'hg files -I "./**/*.py"'`

Reviewed By: mthrok

Differential Revision: D33297351

fbshipit-source-id: 7bf5956edf0717c5ca90219f72414ff4eeaf5aa8