interface for asymmetric pipeline schedule

[erhoo82]

What does this PR do ?

Add the interface for the asymmetric pipeline schedule

Changelog

• Introduce account_for_embedding_in_pipeline_split and account_for_loss_in_pipeline_split args that consider input embedding and loss functions when splitting layers for pipeline schedule.

Usage

Set account_for_embedding_in_pipeline_split=True and account_for_loss_in_pipeline_split=True

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Additional Information

• Related to # (issue)