Parallel SGD: When does averaging help?

23 Jun 2016Jian ZhangChristopher De SaIoannis MitliagkasChristopher Ré

Consider a number of workers running SGD independently on the same pool of data and averaging the models every once in a while -- a common but not well understood practice. We study model averaging as a variance-reducing mechanism and describe two ways in which the frequency of averaging affects convergence... (read more)

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