[JAX] Fixed the shape miss-matching issue in MLP.

[mingxu1067]

Description

Please include a brief summary of the changes, relevant motivation and context. This PR is to fix shaping miss-matching issues inbetween activations and its corresponding sharding contraints in MLP/FF1 when using unfused activation functions.

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)

Changes

Please list the changes introduced in this PR:

• Squeeze output tensors of intermediate acitivations.

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

[mingxu1067]

/te-ci jax

[mingxu1067]

/te-ci jax