Fix torch version check

[muellerzr]

What does this PR do?

The current version check doesn't actually do what it's meant to, as 2.1.0a gets parsed as LT for 2.1.0, making it impossible to do FSDP properly for MS-AMP rn.

Technically this is true, but it works so we can adjust this.

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@BenjaminBossan

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[BenjaminBossan]

I did not quite understand the issue yet. To me, it looks like the two are equivalent:

>>> from accelerate.utils import compare_versions
>>> from packaging.version import Version
>>> compare_versions(Version("2.1.0"), "<", "2.1.0a")
False
>>> not compare_versions(Version("2.1.0"), ">=", "2.1.0a")
False
>>> compare_versions(Version("2.1.0a"), "<", "2.1.0")
True
>>> not compare_versions(Version("2.1.0a"), ">=", "2.1.0")
True

In what situation do you see the discrepancy?

[BenjaminBossan]

LGTM