[Distributed] fix TypeError of multi learning_rate input.#984

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Mesilenceki wants to merge 3 commits intoDeepRec-AI:mainfrom

Mesilenceki:bugs/fix-typeerror_of_hvdoptimizer

Commits on Apr 3, 2024

Commits on Apr 7, 2024

[Distributed] Allow additional horovod DistributedOptimizer args.
Mesilenceki
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