Matthias Boehm created SYSTEMML-2083:
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Summary: 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
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).
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