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- W3192925755 abstract "On‐chip training of neural networks (NNs) is regarded as a promising training method for neuromorphic systems with analog synaptic devices. Herein, a novel on‐chip training method called direct gradient calculation (DGC) is proposed to substitute conventional backpropagation (BP). In this method, the gradients of a cost function with respect to the weights are calculated directly by sequentially applying a small temporal change to each weight and then measuring the change in cost value. DGC achieves a similar accuracy to that of BP while performing a handwritten digit classification task, validating its training feasibility. In particular, DGC can be applied to analog hardware‐based convolutional NNs (CNNs), which is considered to be a challenging task, enabling appropriate on‐chip training. A hybrid method is also proposed that efficiently combines DGC and BP for training CNNs, and the method achieves a similar accuracy to that of BP and DGC while enhancing the training speed. Furthermore, networks utilizing DGC maintain a higher level of accuracy than those using BP in the presence of variations in hardware (such as synaptic device conductance and neuron circuit component variations) while requiring fewer circuit components." @default.
- W3192925755 created "2021-08-16" @default.
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- W3192925755 date "2021-07-05" @default.
- W3192925755 modified "2023-10-17" @default.
- W3192925755 title "Direct Gradient Calculation: Simple and Variation‐Tolerant On‐Chip Training Method for Neural Networks" @default.
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- W3192925755 doi "https://doi.org/10.1002/aisy.202100064" @default.
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