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Bucket/coalesced tensor broadcast in non-colocated refit #1286

@guyueh1

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@guyueh1

Is your feature request related to a problem? Please describe.
For MoE models like qwen 30B or deepseek, need coalesced/bucketized tensor broadcast in non-colocated refit to boost the broadcast effective bandwidth.

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PerformanceRelated to improving performanceasyncRLdeepseekRelated to deepseek 671benhancementNew feature or request

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