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RMRProp and use_locking = False #47

@MogicianWu

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@MogicianWu

In tensorflow document, it says:

use_locking: If True, updating of the var, ms, and mom tensors is protected by a lock; otherwise the behavior is undefined, but may exhibit less contention.

However in the code this flag is set to False. Could this cause a problem by the racing condition?

Also, I don't understand why the original paper states it's better to share g across different threads. Is there any reason to justify this other than empirical evidences?

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