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From "Edward J. Yoon" <edwardy...@apache.org>
Subject Re: DNN at Tencent
Date Wed, 27 May 2015 08:04:10 GMT
Oh wait. a DNN BSPJob partitions the input data (examples) into the
number of tasks, then each task executes SGD graph job using
LocalBSPRunner as a mini-batch, and uses external pm server to avoid
the heavy cost of synchronization of shared variables such as
gradients or parameters. Does it make sense?

On Wed, May 27, 2015 at 9:34 AM, Edward J. Yoon <edward.yoon@samsung.com> wrote:
> According to their architecture, DNN job is consist of multiple (mini-batch)
> SGD job groups and 'ParameterServer' is used for swapping parameters among
> them. Since these mini-batch jobs need to be work asynchronously, I guess we
> can't do this in single job of Hama BSP framework. Hama can be used as a sub
> component.
> --
> Best Regards, Edward J. Yoon
> -----Original Message-----
> From: Chia-Hung Lin [mailto:clin4j@googlemail.com]
> Sent: Tuesday, May 26, 2015 5:40 PM
> To: dev@hama.apache.org
> Subject: Re: DNN at Tencent
> That's why I am working on refactoring core module stuff : )
> BSP is suitable for iterative applications and is for general purpose
> parallelism. So as long as the application can be expressed as
> iterative algorithm, ideally our framework (in terms of higher
> abstraction level) should have no problem for such applications.
> On 26 May 2015 at 16:08, Edward J. Yoon <edwardyoon@apache.org> wrote:
>> Just FYI, http://www.vldb.org/pvldb/vol7/p1772-tencent.pdf
>> According to them, they used BSP model (and additional Parameter
>> server) like google's distbelief. Do you think we can do this?
>> --
>> Best Regards, Edward J. Yoon

Best Regards, Edward J. Yoon

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