Reset AG_pipeline bucket status after validation step.

[vasunvidia]

What does this PR do ?

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flowchart LR
    A[Pre-checks] --> B[PR Tests]
    subgraph Code Review/Approval
        C1[Expert Review] --> C2[Final Review]
    end
    B --> C1
    C2 --> D[Merge]

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[shjwudp]

Can start_param_sync(sync_and_return=True) be replaced with synchronize_param_gather here?

[vasunvidia]

No I tried that. But it is not possible because it's not part of FullyShardedDataParallel class. We need to call synchronize_param_gather within start_param_sync

[shjwudp]

I see, could you try putting the synchronize_param_gather function on FullyShardedDataParallel(example)? The goal is to help keep the start_param_sync function simple, thank you.

[dimapihtar]

/ok to test 1be259b