WO2014187059A1 - 基于阻变忆阻器的时间关联学习神经元电路及其实现方法 - Google Patents
基于阻变忆阻器的时间关联学习神经元电路及其实现方法 Download PDFInfo
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- WO2014187059A1 WO2014187059A1 PCT/CN2013/084752 CN2013084752W WO2014187059A1 WO 2014187059 A1 WO2014187059 A1 WO 2014187059A1 CN 2013084752 W CN2013084752 W CN 2013084752W WO 2014187059 A1 WO2014187059 A1 WO 2014187059A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/02—Neural networks
- G06N3/08—Learning methods
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/02—Neural networks
- G06N3/04—Architecture, e.g. interconnection topology
- G06N3/049—Temporal neural networks, e.g. delay elements, oscillating neurons or pulsed inputs
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/02—Neural networks
- G06N3/06—Physical realisation, i.e. hardware implementation of neural networks, neurons or parts of neurons
- G06N3/063—Physical realisation, i.e. hardware implementation of neural networks, neurons or parts of neurons using electronic means
- G06N3/065—Analogue means
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/54—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using elements simulating biological cells, e.g. neuron
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0007—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements comprising metal oxide memory material, e.g. perovskites
Definitions
- the present invention relates to a neuron cell circuit, and more particularly to a time-dependent learning neuron circuit based on a resistive memristor and an implementation method thereof . Background technique
- Digital computers are an important product of the progress of human science and technology civilization in the twentieth century, and their influence permeates all aspects of people's lives.
- people have been unable to meet the functions of existing computers.
- High computing speed, large storage capacity, and intelligence have become an inevitable trend in the further development of computers.
- neural computers Because of its large-scale parallel processing, strong recognition ability, ability to process analog information, and machine self-learning, neural computers have become powerful substitutes for digital computers in the future.
- the key to hardware manufacturing lies in good weights that can be integrated on a large scale. interconnected.
- a large number of synaptic connections are required in neuronal cell circuits, and these synaptic connections must have variable weights and a small area to facilitate large-scale integration.
- a resistive memristive device used as a synaptic connection in a neuronal cell circuit its resistance is the weight of the synapse.
- the memristor has the characteristics of simple structure, small area, large-scale integration, continuous change of resistance, etc., so its appearance provides a good device basis for the hardware implementation of the neural computer. Therefore, the neuron unit based on the resistive memristor
- the circuit has been extensively studied. In the prior art, the computing function of the digital computer has been completed in the design stage, and after the computer design is completed, the computer merely reproduces the logic that has been set, does not have an independent learning ability, and does not have a meaningful learning function. Summary of the invention
- the present invention proposes a novel neuron circuit capable of realizing the basic learning and memory function of biological neurons. It is an object of the present invention to provide a time-dependent learning neuron circuit based on a resistive memristor.
- the time-dependent learning neuron circuit of the resistive memristor comprises: two neuron cell circuits and a resistive memristor as a synaptic connection therebetween; further, the neuron cell circuit comprises: an excitation a signal terminal, a synaptic connection terminal, a buffer, a control signal inverter, a first transmission gate, and a second transmission gate; wherein The output end of the buffer is connected to the excitation signal end, and the input end is connected to one signal end of the second transmission gate; the input end of the control signal inverter is connected to the excitation signal end, the positive control end of the first transmission gate, and the second transmission a negative control end of the door, the output end being connected to the negative control end of the first transmission gate and the positive control end of the second transmission gate; one signal end of the first transmission gate is connected to the voltage source, and the other signal end is connected to the synaptic connection;
- the positive control terminal is connected to the excitation signal terminal, and the negative control terminal is connected to the output terminal of the control signal
- the resistive memristor is a sandwich structure including a top electrode, a bottom electrode, and a resistive material filled therebetween.
- the material of the top electrode and the bottom electrode is made of metal.
- the resistive memristor is a resistor programmed by voltage, that is, the resistance of the device can be changed by applying a certain voltage. Such devices have been extensively studied in the current academic field. According to the polarity of the programming voltage, the device can be classified into a unipolar resistive memristor and a bipolar resistive memristor. The correlation between the two neuronal cell circuits will be determined by the resistive memristor that is the synaptic connection between the two.
- the two neuron cell circuits are a pre-neuron cell circuit and a post-neuron cell circuit, and the control terminal of the first transmission gate of the pre-neuron cell circuit is connected to the positive voltage source, and the first transmission gate of the post-neuron cell circuit is controlled. The terminal is connected to a negative voltage source.
- the synaptic junction of the anterior neuronal cell circuit is connected to the top electrode of the resistive memristor by a metal connection; the synaptic terminal of the posterior neuron cell circuit is connected to the bottom electrode of the resistive memristor by a metal connection.
- the pre-neuron cell circuit receives the excitation signal, a positive voltage is applied to the resistive memristor through the synaptic connection end; when the post-neuron cell circuit receives the excitation signal, a negative voltage is applied to the resistive memristor through the synaptic connection end,
- a large voltage difference is generated at both ends of the resistive memristor, so that the resistance of the resistive memristor becomes small.
- the excitation signal end of the neuron cell circuit can be used as the input end of the excitation signal or as the output end of the excitation signal.
- the excitation signal When used as the input end of the excitation signal, the excitation signal is input from the excitation signal end and connected to the positive of the first transmission gate.
- the control terminal can be turned on by opening the first transmission gate, and the second transmission gate is turned off, thereby applying a voltage source signal to the synaptic connection terminal, and the voltage source signal is given by the voltage source; when used as the output end of the excitation signal, as a buffer
- the input of the buffer is connected to the synaptic connection.
- the buffer is an even number of inverters connected in series to improve the driving capability of the next stage circuit and make the voltage more stable.
- the strength of this learning memory is determined by the strength of the synaptic association, and the strength of the association is determined by the length of the learning time.
- This time-related learning and memory model is related to the resistance of the resistance-replacement memristor The characteristics are very similar and this is the theoretical basis on which the invention is based. Then, the implementation principle of the present invention will be briefly explained.
- the two neuron cell circuits are simultaneously connected to their respective excitation signals, they respectively generate a stress signal to the respective excitation signals, and the stress signals are applied to the resistive memristor connected thereto through the metal wires.
- Another object of the present invention is to provide a method for implementing time-dependent learning based on a time-dependent learning neuron circuit of a resistive memristor.
- the method for implementing time-dependent learning by using a time-dependent learning neuron circuit based on a resistive memristor comprises the following steps:
- the first step establish an association
- any of the two neuron cell circuits When any of the two neuron cell circuits receives the previously learned excitation signal again, it will influence the other neuron cell circuit through its own stress signal, through the resistive memristor, and It generates its corresponding excitation signal.
- the implementation of time-dependent learning is extremely accurate in mimicking the human learning process. Advantages of the invention:
- the invention utilizes the switching characteristic of the resistive memristor, and when both ends thereof are synchronously selected by the two excitation signals, a voltage drop can be formed at both ends of the device to cause resistance change, thereby realizing the synapse
- the breaking of the connection realizes the correlation of the two excitation signals, has memory characteristics, and can reproduce the previous excitation signal, that is, achieve the learning purpose. Due to the simple structure and high integration of the resistive memristor, large-scale physical neuron synaptic connections can be realized to achieve more complex learning and even logic functions, which have a good application prospect in neuron computing. . DRAWINGS
- FIG. 1 is a schematic structural view of a time-dependent learning neuron circuit based on a resistive memristor of the present invention
- FIG. 2 is an internal circuit diagram of an embodiment of a neuron cell circuit of the present invention
- Fig. 4 is a graph showing the operation timing of an embodiment of the resistive memristor of the present invention.
- the time-dependent learning neuron circuit based on the resistive memristor comprises: two neuron cell circuits 1 and 2 and a resistive memristor 3 as a synaptic connection therebetween;
- the neuron cell circuit includes: an excitation signal terminal P, a synaptic connection terminal M, a buffer, and a control signal inverter. N1, the first transmission gate T1 and the second transmission gate T2; wherein the output end of the buffer is connected to the excitation signal terminal P, and the input terminal in is connected to a signal terminal of the second transmission gate T2;
- the input terminal in of the control signal inverter N1 is connected to the excitation signal terminal P, the positive control terminal S of the first transmission gate T1 and the negative control terminal ⁇ of the second transmission gate T2, and the output terminal out is connected to the first transmission gate T1.
- the terminal P, the negative control terminal ⁇ is connected to the output terminal out of the control signal inverter N1; one signal terminal of the second transmission gate T2 is connected to the input terminal in of the buffer, and the other signal terminal is connected to the synaptic connection terminal M,
- the positive control port S is connected to the excitation signal terminal P, and the negative control terminal ⁇ is connected to the output terminal out of the control signal inverter N1.
- the buffer is composed of two inverters N1 and N2 connected in series
- the resistive memristor is a sandwich structure including a top electrode 31, a bottom electrode 32, and a resistive material 33 filled therebetween.
- a bipolar resistive memristor is used.
- the resistance value R of the resistive memristor will change, and the larger or smaller the voltage polarity is determined, when the voltage is positive In the case of time, the resistance becomes smaller.
- the resistance becomes larger, and the change in resistance changes in a nonlinear manner, and the amount of change is positively correlated with time t and voltage V.
- the resistance value of the resistive memristor When the voltage difference applied across the resistive memristor is lower than the threshold, the resistance value of the resistive memristor will not change, exhibiting a memory characteristic.
- the working principle of the resistive memristor is shown in Figure 4.
- the voltage value in the first period is less than the programmed threshold, and the resistance remains unchanged.
- the second period t 2 the forward voltage is higher than the programmed threshold, and the resistance value changes. From large to small, and a non-linear gradual change, the change is getting faster and faster with the increase of time (this mechanism has been confirmed by experiments and theory, the specific principle is not detailed here), its characteristics and The patterns of human cognitive learning have very similarities and similarities.
- the third time period t 3 which is a voltage lower than the threshold, will remain unchanged, which is equivalent to the memory in the learning process.
- the fourth time period t 4 a reverse voltage is applied, and the voltage value is higher than the programming threshold Vreset, and the resistance value changes from small to large, and also exhibits a nonlinearity. This time, as time goes on, the change is getting slower and slower. Similarly, this is consistent with the law of forgetting in human cognitive learning.
- the two neuronal cell circuits are the anterior neuron cell circuit 1 and the posterior neuron cell circuit 2, the anterior nerve
- the control terminal of the first transmission gate of the cell circuit is connected to the positive voltage source Vp
- the control terminal of the first transmission gate of the post-neuron cell circuit 2 is connected to the negative voltage source Vn.
- the excitation signal terminal P of the neuron cell circuit can be used as the input end of the excitation signal or as the output end of the excitation signal. When used as the input end of the excitation signal, the excitation signal is input from the excitation signal terminal and connected to the first transmission gate T1.
- the positive control terminal can be opened by opening the first transmission gate T1, and the second transmission threshold 2 is turned off, thereby applying a voltage source signal to the synaptic connection terminal ⁇ , and the voltage source signal is given by an independent voltage source; as an excitation signal
- the output as the output of the buffer, the input of the buffer is connected to the synaptic terminal.
- the specific working process is as follows: When establishing the association, two excitation signals that need to be associated are respectively input through the excitation signal end of the two neuron cell circuits, and then the transmission gate in the circuit is opened to generate a stress signal. The transmission gates are given to their respective ports. Two oppositely polarized stress voltage signals are again transmitted outward through the port to the top and bottom electrodes of the resistive memristor.
- the resistive memristor Since the voltage difference at this time exceeds the threshold voltage at which the resistive memristor is resistively changed, the resistive memristor is resistively changed, and the resistance value is greatly reduced due to the forward voltage polarity.
- the resistance value becomes smaller, and the corresponding synaptic connection weight is increased, that is, when the neuron cell circuit receives the excitation signal, the probability that the excitation signal is also affected by the other neuron cell circuit, that is, the two excitation signals Or there is a correlation between the two cellular circuits.
- the increase in weight is determined by the length of time that two excitation signals are simultaneously applied. The longer the time, the greater the weight, the greater the correlation between the two, and the higher the success rate of the reverse retelling; the smaller the opposite.
- the excitation signal which in turn causes a stress signal to the neuronal cell circuit, again causes the synaptic connection to increase in weight. That is to say, each reverse retelling is a deepening of the learning process.
- This is similar to the principle in human cognitive learning.
- the following describes an implementation method for performing time-dependent learning of a time-dependent learning neuron circuit based on a resistive memristor, which includes two parts:
- the first step is to establish a correlation.
- the two stress voltage signals alone cannot cause the resistive memristor to resist, that is, a single voltage.
- the amplitude of the signal does not reach the threshold for blocking the resistive memristor, and when one positive, one negative and two voltage signals are superimposed, the voltage difference on the resistive memristor will be the absolute value of the two voltage signals.
- the sum of the values exceeds the threshold, and the resistive memristor will resist, that is, start to change the connection weight between the two neuron cell circuits, which establishes the correlation between the two excitation signals, and this correlation
- the establishment which requires two excitation signals to be applied at the same time, will occur, and it will satisfy the human learning cognition.
- the second step is to repeat the above functions as the first step in learning cognition. To complete the learning function, it is necessary to successfully reverse the previous learning content.
- the retelling process in the neuron cell circuit is when the two excitation signals are only When one occurs, another stimulus is automatically generated. Whether it is the anterior neuronal cell circuit or the post-neuron cell circuit, when one of the re-examination signals is received again, it will be transmitted to the synaptic connection with another neuron cell circuit through the stress signal.
- the design circuit has completed the original process of simulating human cognition, and can realize the recognition and learning of the two signals, and can successfully reverse the reversal. It is to be understood that the present invention is intended to be a further understanding of the present invention, and it is understood by those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the invention and the appended claims It is possible. Therefore, the invention should not be limited by the scope of the invention, and the scope of the invention is defined by the scope of the claims.
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US14/892,130 US20160110644A1 (en) | 2013-05-24 | 2013-09-30 | Time Correlation Learning Neuron Circuit Based on a Resistive Memristor and an Implementation Method Thereof |
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CN201310197061.7A CN103246904B (zh) | 2013-05-24 | 2013-05-24 | 基于阻变忆阻器的时间关联学习神经元电路及其实现方法 |
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CN103246904A (zh) | 2013-08-14 |
CN103246904B (zh) | 2016-04-06 |
US20160110644A1 (en) | 2016-04-21 |
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