Abstract
Deep Neural Networks (DNNs) are becoming an important tool in modern
computing applications. Accelerating their training is a major challenge and
techniques range from distributed algorithms to low-level circuit design. In
this survey, we describe the problem from a theoretical perspective, followed
by approaches for its parallelization. We present trends in DNN architectures
and the resulting implications on parallelization strategies. We then review
and model the different types of concurrency in DNNs: from the single operator,
through parallelism in network inference and training, to distributed deep
learning. We discuss asynchronous stochastic optimization, distributed system
architectures, communication schemes, and neural architecture search. Based on
those approaches, we extrapolate potential directions for parallelism in deep
learning.
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