[EP] renaming uccl.ep to uccl_ep

[YangZhou1997]

Description

Please include a summary of the changes and the related issue.

Fixes # (issue)

Type of Change

• Bug fix
• New feature
• Documentation update

How Has This Been Tested?

Include any tests here.

• Unit tests
• Integration tests
• Manual testing

Checklist

• My code follows the style guidelines, e.g. format.sh.
• I have run build_and_install.sh to verify compilation.
• I have removed redundant variables and comments.
• I have updated the documentation.
• I have added tests.

[YangZhou1997]

This PR separate uccl_ep as a independent wheel (rather than uccl.ep) with its own pyproject.toml and build.sh, suitable for future wheel release via pypi

cc @zhenhuang12 , @praveingk

[MaoZiming]

@YangZhou1997 Could you remind me what do you mean by "uccl_ep as a independent wheel "?
are we thinking about an interface like from uccl import ep?

[YangZhou1997]

It is actually directly import uccl_ep instead of ep as part of uccl wheel, so ep and other parts can evolve independently.

[MaoZiming]

Shouldn't the entire uccl have one release?

[YangZhou1997]

I remember @praveingk once thinks better to have separate wheels?

[praveingk]

@YangZhou1997 I am not opposed to having the same wheel for ep and p2p . I think the separation was intended more for collectives. In fact, same wheel might be better since just one installation is required for inference builds.

[MaoZiming]

@YangZhou1997 @praveingk
I think having the same wheel version for the entire repo is more clear (many open-sourced projects have multiple libraries, but they have a single wheel). But I agree that there might be some coordination (e.g. making sure all libraries are stable before releasing a wheel)

[YangZhou1997]

Sounds good. Let's stick to a single wheel then!