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An optical neural network processor and a calculation method thereof

A neural network and optical computing technology, applied in biological neural network models, physical implementation, etc., can solve problems such as limited performance of optical neural network processors, low accuracy of results, slow convergence speed, etc., and achieve a good test recognition rate , to speed up convergence and improve accuracy

Active Publication Date: 2019-05-21
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing optical devices are difficult to match with traditional computing theory based on Boolean logic.
Directly applying optical neurons to the traditional processor structure, the performance of the obtained optical neural network processor is limited, which makes it easy to have slow convergence speed or inaccurate output results when using such hardware for training and iteration. high case

Method used

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  • An optical neural network processor and a calculation method thereof
  • An optical neural network processor and a calculation method thereof
  • An optical neural network processor and a calculation method thereof

Examples

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Embodiment 1

[0052] According to one embodiment of the present invention, there is provided a neuron structure based on light technology (also referred to as a light neuron herein), see figure 2 As shown, the optical neuron includes a laser module 210 , a synaptic input modulation module 220 , a synaptic weight modulation module 230 , a light aggregation module 240 and a light intensity detection module 250 .

[0053] The laser module 210 includes multiple lasers for generating continuous and stable single-wavelength or multi-wavelength optical signals.

[0054] The synaptic input modulation module 220 includes a plurality of synaptic input modulators, each synapse of the optical neuron corresponds to a synaptic input modulator, and the synaptic input modulation module 220 is used to modulate the optical signal generated by the laser, for example , using intensity modulation to generate the desired light intensity distribution to carry the light signal corresponding to the input neuron va...

Embodiment 2

[0060] image 3 Further shows the optical neuron structure of a preferred embodiment of the present invention, including a laser module 310, a synaptic input modulation module 320, a synaptic weight modulation module 330, a light aggregation module 340 and a light intensity detection module 350, and figure 2 The examples differ in that, image 3 In the embodiment, the neuron structure is realized by two optical signals.

[0061] The synaptic input modulation module 320 consists of two discrete optical modulators, referred to as a positive input modulator and a negative input modulator, respectively. According to another embodiment of the present invention, the synaptic input modulation module 320 is an integrated light modulator. Correspondingly, the synaptic weight modulation module 330 is divided into a positive weight modulator and a negative weight modulator, and the light aggregation module 340 is composed of a positive light aggregator and a negative light aggregator....

Embodiment 3

[0078] In one embodiment, for the variable weight value operation mode, configure less number of neurons, the neural network processing system (combined with image 3 shown) workflow includes the following steps:

[0079] Step S410, before the system runs, the weight matrix of the neural network is decomposed into blocks, and a large matrix is ​​divided into several small block matrices, thereby adapting to the number of neurons in the system;

[0080] Step S420, decomposing each synaptic input value xi in the form of positive and negative numbers to control the positive input modulator and negative input modulator of each synapse respectively;

[0081] Step S430, for each group of neuron operations, input weight information to the synaptic weight modulation module to complete the modulation of synaptic weights;

[0082] Step S440, for each group of neuron operations, input neuron information to the synaptic input modulation module to complete the modulation of synaptic input...

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Abstract

The invention provides an optical neural network processor and a computing method thereof. The processor comprises a numerical mapping device, a positive value optical calculation device, a negative value optical calculation device, a photoelectric converter, a subtracter and a nonlinear activation device. During calculation, weights and input values of a network layer in a neural network model are mapped into an integer domain which can be represented by optical neurons and are divided into positive and negative optical paths for calculation of the network layer, and two paths of calculationresults are combined into one path through a subtracter.

Description

technical field [0001] The invention relates to the acceleration of neural network calculation, in particular to a neural network processor based on the optical principle and a calculation method thereof. Background technique [0002] Since the dawn of the computer, humans have tried to use computing to build a new kind of intelligent machine that can respond in ways similar to human intelligence. After more than half a century of ups and downs, artificial intelligence has become an important branch of computer science. As the mainstream method in the field of artificial intelligence, the deep learning algorithm based on big data has attracted more and more attention. It has played a fundamental role in the fields of natural language processing, drones, and information security, and has created a huge economy for the society. value. [0003] An artificial neural network consists of a large number of neurons. The neuron is a device structure capable of simulating the funct...

Claims

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Application Information

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IPC IPC(8): G06N3/067
Inventor 马恬煜臧大伟刘伯然沈华谭光明张佩珩孙凝晖
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI
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