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Physical deep learning with biologically inspired training method: gradient-free approach for physical hardware

Author

Listed:
  • Mitsumasa Nakajima

    (NTT Device Technology Labs.)

  • Katsuma Inoue

    (The University of Tokyo)

  • Kenji Tanaka

    (NTT Device Technology Labs.)

  • Yasuo Kuniyoshi

    (The University of Tokyo
    The University of Tokyo)

  • Toshikazu Hashimoto

    (NTT Device Technology Labs.)

  • Kohei Nakajima

    (The University of Tokyo
    The University of Tokyo)

Abstract

Ever-growing demand for artificial intelligence has motivated research on unconventional computation based on physical devices. While such computation devices mimic brain-inspired analog information processing, the learning procedures still rely on methods optimized for digital processing such as backpropagation, which is not suitable for physical implementation. Here, we present physical deep learning by extending a biologically inspired training algorithm called direct feedback alignment. Unlike the original algorithm, the proposed method is based on random projection with alternative nonlinear activation. Thus, we can train a physical neural network without knowledge about the physical system and its gradient. In addition, we can emulate the computation for this training on scalable physical hardware. We demonstrate the proof-of-concept using an optoelectronic recurrent neural network called deep reservoir computer. We confirmed the potential for accelerated computation with competitive performance on benchmarks. Our results provide practical solutions for the training and acceleration of neuromorphic computation.

Suggested Citation

  • Mitsumasa Nakajima & Katsuma Inoue & Kenji Tanaka & Yasuo Kuniyoshi & Toshikazu Hashimoto & Kohei Nakajima, 2022. "Physical deep learning with biologically inspired training method: gradient-free approach for physical hardware," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-35216-2
    DOI: 10.1038/s41467-022-35216-2
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    References listed on IDEAS

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    1. Fangjun Hu & Saeed A. Khan & Nicholas T. Bronn & Gerasimos Angelatos & Graham E. Rowlands & Guilhem J. Ribeill & Hakan E. Türeci, 2024. "Overcoming the coherence time barrier in quantum machine learning on temporal data," Nature Communications, Nature, vol. 15(1), pages 1-12, December.

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