[Horovod][12. Overall architecture of elastic training] Questions

[Horovod][13. Driver of elastic training][ElasticDriver] Questions

[Horovod][14. Elastic Training Discovery Node & State] Questions

[Horovod] 15. Broadcast & notification

[Horovod] 17. Fault tolerance of elastic training

[Horovod] 21. How to resume training

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