title: Hierarchical Chunking of Sequential Memory on Neuromorphic Architecture with Reduced Synaptic Plasticity.
abstract: Chunking refers to a phenomenon whereby individuals group items together when performing a memory task to improve the performance of sequential memory. In this work, we build a bio-plausible hierarchical chunking of sequential memory (HCSM) model to explain why such improvement happens. We address this issue by linking hierarchical chunking with synaptic plasticity and neuromorphic engineering. We uncover that a chunking mechanism reduces the requirements of synaptic plasticity since it allows applying synapses with narrow dynamic range and low precision to perform a memory task. We validate a hardware version of the model through simulation, based on measured memristor behavior with narrow dynamic range in neuromorphic circuits, which reveals how chunking works and what role it plays in encoding sequential memory. Our work deepens the understanding of sequential memory and enables incorporating it for the investigation of the brain-inspired computing on neuromorphic architecture.
authors.affiliation: Department of Precision Instrument, Center for Brain Inspired Computing Research, Tsinghua University Beijing, China.
authors.forename: Guoqi
authors.initials: G
authors.lastname: Li
authors.affiliation: Department of Precision Instrument, Center for Brain Inspired Computing Research, Tsinghua University Beijing, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Deng
authors.affiliation: Department of Precision Instrument, Center for Brain Inspired Computing Research, Tsinghua University Beijing, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.affiliation: School of Automation Science and Electric Engineering, Beihang University Beijing, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, Tsinghua University Beijing, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Zeng
authors.affiliation: Department of Precision Instrument, Center for Brain Inspired Computing Research, Tsinghua University Beijing, China.
authors.forename: Ziyang
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Department of Precision Instrument, Center for Brain Inspired Computing Research, Tsinghua University Beijing, China.
authors.forename: Huanglong
authors.initials: H
authors.lastname: Li
authors.affiliation: School of Medicine, Tsinghua University Beijing, China.
authors.forename: Sen
authors.initials: S
authors.lastname: Song
authors.affiliation: Department of Precision Instrument, Center for Brain Inspired Computing Research, Tsinghua University Beijing, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Pei
authors.affiliation: Department of Precision Instrument, Center for Brain Inspired Computing Research, Tsinghua University Beijing, China.
authors.forename: Luping
authors.initials: L
authors.lastname: Shi
keywords: chunking; memristor; neuromorphic engineering; sequential memory; synaptic plasticity