LI Guobao created SYSTEMML-2324:
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Summary: Synchronization
Key: SYSTEMML-2324
URL: https://issues.apache.org/jira/browse/SYSTEMML-2324
Project: SystemML
Issue Type: Sub-task
Reporter: LI Guobao
Assignee: LI Guobao
We also need to implement the synchronization between workers and parameter
server to be able to bring more parameter update strategies, e.g., the
stale-synchronous strategy needs a hyperparameter "staleness" to define the
waiting interval. The idea is to maintain a vector clock recording all workers'
clock in the server. Each time when an iteration in side of worker finishes, it
waits server to give a signal, i.e., to send a request for calculating the
staleness according to the vector clock. And when the server receives the
gradients from certain worker, it will increment the vector clock for this
worker. So we could define BSP as "staleness==0", ASP as "staleness==-1" and
SSP as "staleness==N".
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