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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SYSTEMML-2083) Language and runtime for parameter servers
Date Sun, 18 Mar 2018 00:15:00 GMT

    [ https://issues.apache.org/jira/browse/SYSTEMML-2083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16403804#comment-16403804
] 

Matthias Boehm commented on SYSTEMML-2083:
------------------------------------------

For all students working on proposals, please don't share them here but go through the official
channel of the GSoC website - we'll provide comments and feedback there.

> Language and runtime for parameter servers
> ------------------------------------------
>
>                 Key: SYSTEMML-2083
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2083
>             Project: SystemML
>          Issue Type: Epic
>            Reporter: Matthias Boehm
>            Priority: Major
>              Labels: gsoc2018
>         Attachments: image-2018-02-14-12-18-48-932.png, image-2018-02-14-12-21-00-932.png,
image-2018-02-14-12-31-37-563.png
>
>
> SystemML already provides a rich set of execution strategies ranging from local operations
to large-scale computation on MapReduce or Spark. In this context, we support both data-parallel
(multi-threaded or distributed operations) as well as task-parallel computation (multi-threaded
or distributed parfor loops). This epic aims to complement the existing execution strategies
by language and runtime primitives for parameter servers, i.e., model-parallel execution.
We use the terminology of model-parallel execution with distributed data and distributed model
to differentiate them from the existing data-parallel operations. Target applications are
distributed deep learning and mini-batch algorithms in general. These new abstractions will
help making SystemML a unified framework for small- and large-scale machine learning that
supports all three major execution strategies in a single framework.
>  
> A major challenge is the integration of stateful parameter servers and their common push/pull
primitives into an otherwise functional (and thus, stateless) language. We will approach this
challenge via a new builtin function {{paramserv}} which internally maintains state but at
the same time fits into the runtime framework of stateless operations.
> Furthermore, we are interested in providing (1) different runtime backends (local and
distributed), (2) different parameter server modes (synchronous, asynchronous, hogwild!, stale-synchronous),
(3) different update frequencies (batch, multi-batch, epoch), as well as (4) different architectures
for distributed data (1 parameter server, k workers) and distributed model (k1 parameter servers,
k2 workers). 
>  
> *Note for GSOC students:* This is large project which will be broken down into sub projects,
so everybody will be having their share of pie.
> *Prerequistes:* Java, machine learning experience is a plus but not required.



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