[Paddle] Fix forward and backward logic of te.Linear(parallel_mode='column') to adapt DiT of PaddleMIX

[yumin066]

Description

In the DiT of PaddleMIX, the Linear(parallel_mode='column') is not used in pairs with Linear(parallel_mode='row'). In order to use transformer engine backend in DiT, the output of te.Linear(parallel_mode='column') should to be all-gathered when forward and reduce-scattered when backward.

Fixes # (issue)

Type of change

• [ ] Documentation change (change only to the documentation, either a fix or a new content)
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Infra/Build change
• [ ] Code refractor

Changes

Please list the changes introduced in this PR:

• Add all-gather and reduce-scatter to the forward and backward logic of te.Linear(parallel_mode='column')

Checklist:

• [x] I have read and followed the contributing guidelines
• [x] The functionality is complete
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes

[yumin066]

/te-ci paddle

[zlsh80826]

/te-ci paddle

[jeng1220]

LGTM