A brain-inspired computing chip and computing device
A computing chip and brain-like technology, applied in the field of brain-like computing chips and computing equipment, can solve problems such as low power consumption, inability to support models, and insufficient programmability
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Embodiment 1
[0054] Embodiment one, Leaky Integrate and Fire (LIF) model
[0055] 1. Update neuron membrane potential value: update the membrane potential value V of LIF pulsed neurons at time t 1 (t), the membrane potential value V of the neuron at time t 1 (t) can be expressed as: axon input X(t) and synaptic weight W 1 The dot product of , and the membrane potential value V maintained by the neuron at the last moment 1rst (t) The sum of the values after the effect of the membrane potential decay coefficient α, as shown in the following formula:
[0056] V 1 (t)=X(t)·W 1 +αV 1rst (t-1) formula (1)
[0057] 2. Neuron output judgment: the output of the LIF pulse neuron is the presence or absence of a pulse represented by 0 or 1, and the output pulse y 1 (t) The neuronal membrane potential V at time t 1 (t) After adding the bias term b (also known as the Changzhi attenuation term), it is related to the neuron threshold V th For comparison, when the biased membrane potential value...
Embodiment 2
[0080] Embodiment 2 Izhikevich Model model
[0081] The Izhikevich Model uses a differential equation to represent the update of the neuron membrane potential, as shown in the following formula, where v represents the membrane potential of the Izhikevich neuron; u is the recovery variable, which is used to describe the Na in the biological neuron + 、K + I represents the input stimulus received by the neuron, similar to the first embodiment of the invention, the input stimulus is obtained by the product of the axon input X and the synaptic weight W.
[0082] Formula (4) shows that the change of neuron membrane potential v over time is determined by itself, the current recovery variable u and the input stimulus I, and formula (5) shows that the change of recovery variable u over time is determined by itself and the current The neuron membrane potential v is jointly determined, and the formula (6) describes the output judgment of the neuron and the reset update logic of the neur...
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