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Resistive memory device requirements for a neural algorithm accelerator

Proceedings of the International Joint Conference on Neural Networks

Agarwal, Sapan A.; Plimpton, Steven J.; Hughart, David R.; Hsia, Alexander W.; Richter, Isaac; Cox, Jonathan A.; James, Conrad D.; Marinella, Matthew J.

Resistive memories enable dramatic energy reductions for neural algorithms. We propose a general purpose neural architecture that can accelerate many different algorithms and determine the device properties that will be needed to run backpropagation on the neural architecture. To maintain high accuracy, the read noise standard deviation should be less than 5% of the weight range. The write noise standard deviation should be less than 0.4% of the weight range and up to 300% of a characteristic update (for the datasets tested). Asymmetric nonlinearities in the change in conductance vs pulse cause weight decay and significantly reduce the accuracy, while moderate symmetric nonlinearities do not have an effect. In order to allow for parallel reads and writes the write current should be less than 100 nA as well.

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3 Results