Set a default value when getting rampup_batch_size

[yaox12]

What does this PR do ?

Set a default value when getting rampup_batch_size. Otherwise, configs without setting the value would result in errors.

Collection: [Note which collection this PR will affect]

[NLP]

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[github-actions]

This PR is stale because it has been open for 14 days with no activity. Remove stale label or comment or update or this will be closed in 7 days.

[github-actions]

This PR is stale because it has been open for 14 days with no activity. Remove stale label or comment or update or this will be closed in 7 days.