Preventing Vanishing Gradient Problem of Hardware Neuromorphic System by Implementing Imidazole-Based Memristive ReLU Activation Neuron

Jungyeop Oh, Sungkyu Kim, Changhyeon Lee, Jun Hwe Cha, Sang Yoon Yang, Sung Gap Im, Cheolmin Park, Byung Chul Jang, Sung Yool Choi

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

With advances in artificial intelligent services, brain-inspired neuromorphic systems with synaptic devices are recently attracting significant interest to circumvent the von Neumann bottleneck. However, the increasing trend of deep neural network parameters causes huge power consumption and large area overhead of a nonlinear neuron electronic circuit, and it incurs a vanishing gradient problem. Here, a memristor-based compact and energy-efficient neuron device is presented to implement a rectifying linear unit (ReLU) activation function. To emulate the volatile and gradual switching of the ReLU function, a copolymer memristor with a hybrid structure is proposed using a copolymer/inorganic bilayer. The functional copolymer film developed by introducing imidazole functional groups enables the formation of nanocluster-type pseudo-conductive filaments by boosting the nucleation of Cu nanoclusters, causing gradual switching. The ReLU neuron device is successfully demonstrated by integrating the memristor with amorphous InGaZnO thin-film transistors, and achieves 0.5 pJ of energy consumption based on sub-10 µA operation current and high-speed switching of 650 ns. Furthermore, device-to-system-level simulation using neuron devices on the MNIST dataset demonstrates that the vanishing gradient problem is effectively resolved by five-layer deep neural networks. The proposed neuron device will enable the implementation of high-density and energy-efficient hardware neuromorphic systems.

Original languageEnglish
Article number2300023
JournalAdvanced Materials
Volume35
Issue number24
DOIs
StatePublished - 15 Jun 2023

Keywords

  • ReLU activation neuron
  • deep neural network
  • initiated chemical vapor deposition
  • neuromorphic computing
  • vanishing gradient problem

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