Installation fails with setuptools >=82 due to runtime import of pkg_resources

[Tripton]

Hi, thanks a lot for maintaining AlphaCLIP 🙂

We recently ran into an installation issue when AlphaCLIP is used as a dependency with modern Python packaging environments.

AlphaCLIP currently imports pkg_resources at runtime:

from pkg_resources import packaging

Unfortunately, `pkg_resources has been deprecated as an API for some time and has now been removed in setuptools 82.0.0 (2026-02-08 - https://setuptools.pypa.io/en/latest/history.html#v82-0-0).

As a result, installing projects that depend on AlphaCLIP fails with:

ModuleNotFoundError: No module named 'pkg_resources'

when using setuptools ≥82.

Maybe this could be fixed by replacing:

from pkg_resources import packaging

with:

from packaging.version import parse as parse_version

and update usages accordingly, e.g.:

if parse_version(torch.__version__) < parse_version("1.7.1"):

Also packaging should be added as an explicit dependency.

This removes the runtime dependency on setuptools internals and restores compatibility with modern setuptools versions.
Happy to open a PR if that helps 🙂