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- Title
Reconfigurable Stochastic neurons based on tin oxide/MoS<sub>2</sub> hetero-memristors for simulated annealing and the Boltzmann machine.
- Authors
Yan, Xiaodong; Ma, Jiahui; Wu, Tong; Zhang, Aoyang; Wu, Jiangbin; Chin, Matthew; Zhang, Zhihan; Dubey, Madan; Wu, Wei; Chen, Mike Shuo-Wei; Guo, Jing; Wang, Han
- Abstract
Neuromorphic hardware implementation of Boltzmann Machine using a network of stochastic neurons can allow non-deterministic polynomial-time (NP) hard combinatorial optimization problems to be efficiently solved. Efficient implementation of such Boltzmann Machine with simulated annealing desires the statistical parameters of the stochastic neurons to be dynamically tunable, however, there has been limited research on stochastic semiconductor devices with controllable statistical distributions. Here, we demonstrate a reconfigurable tin oxide (SnOx)/molybdenum disulfide (MoS2) heterogeneous memristive device that can realize tunable stochastic dynamics in its output sampling characteristics. The device can sample exponential-class sigmoidal distributions analogous to the Fermi-Dirac distribution of physical systems with quantitatively defined tunable "temperature" effect. A BM composed of these tunable stochastic neuron devices, which can enable simulated annealing with designed "cooling" strategies, is conducted to solve the MAX-SAT, a representative in NP-hard combinatorial optimization problems. Quantitative insights into the effect of different "cooling" strategies on improving the BM optimization process efficiency are also provided. Boltzmann Machines offer the potential of more efficient solutions to combinatorial problems compared to von Neumann computing architectures. Here, Yan et al introduce a stochastic memristor with dynamically tunable properties, a vital feature for the efficient implementation of a Boltzmann Machine.
- Subjects
VON Neumann, John, 1903-1957; BOLTZMANN machine; SIMULATED annealing; TIN; FERMI-Dirac distribution; COMBINATORIAL optimization
- Publication
Nature Communications, 2021, Vol 12, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-021-26012-5