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arXiv 2407.04718cs.ETcs.NEphysics.app-ph
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基于事件的随机忆阻器模拟用于类脑计算

Event-Based Simulation of Stochastic Memristive Devices for Neuromorphic Computing

Waleed El-Geresy, Christos Papavassiliou, Deniz Gündüz

AI总结:

本文提出了一种基于事件的忆阻器建模框架,用于模拟类脑计算系统,通过波动状态变量和读出方程改进了忆阻器的动态行为和突触功能。

摘要:

本文构建了一个通用的忆阻器建模框架,适用于事件基系统的模拟,如硬件脉冲神经网络,以及更广泛地,由三个独立组件组成的类脑计算系统:i)一种事件基建模方法,扩展和推广现有的通用忆阻器模型——通用亚稳开关模型(GMSM),消除与离散时间近似相关的错误,并在适用于类脑忆阻器系统模拟方面提供潜在改进;ii)一个波动状态变量,以统一理解不同的非线性和波动现象,包括状态弛豫、结构破坏、焦耳加热和不同忆阻器器件中的非线性漂移;iii)一个读出方程,将隐状态变量的演变与感兴趣的显变量如瞬时电阻分离。我们展示了该框架的示例实现,基于所提出的线性电导模型,针对氧化钛忆阻器的电阻漂移数据集进行调整。最后,我们通过演示波动状态变量对开关动态的贡献,突显该模型在类脑计算中的应用,产生频率依赖的开关(对于稳定忆阻器作为可编程突触权重)和动作电位的生成(对于不稳定忆阻器作为脉冲发生器)。

英文摘要:

In this paper, we build a general modelling framework for memristors, suitable for the simulation of event-based systems such as hardware spiking neural networks, and more generally, neuromorphic computing systems composed of three independent components: i) an event-based modelling approach, extending and generalising an existing general model of memristors - the Generalised Metastable Switch Model (GMSM) - eliminating errors associated with discrete time approximation, as well as offering potential improvements in terms of suitability for neuromorphic memristive system simulations; ii) a volatility state variable to allow for the unified understanding of disparate non-linear and volatile phenomena, including state relaxation, structural disruption, Joule heating, and non-linear drift in different memristive devices; and iii) a readout equation that separates the latent state variable evolution from explicit variables of interest such as an instantaneous resistance. We exhibit an illustrative implementation of this framework, fit to a resistive drift dataset for titanium dioxide memristors, based on a proposed linear conductance model for resistive drift in the devices. Finally, we highlight the application of the model to neuromorphic computing, through demonstrating the contribution of the volatility state variable to switching dynamics, resulting in frequency-dependent switching (for stable memristors acting as programmable synaptic weights) and the generation of action potentials (for unstable memristors, acting as spike-generators).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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