Optimization system, optimization apparatus, and optimization system control method

An optimization system control method comprising:

• calculating, by an optimization apparatus included in an optimization system, a first change portion of an energy change caused by a change in a value of a first neuron that belongs to a neuron group selected from all neurons corresponding to all state variables of an evaluation function indicative of an energy, the first change portion being caused by an influence of another neuron that belongs to the neuron group, determining by a stochastic search whether to allow an update of the value of the first neuron, based on a sum of the first change portion and a second change portion of the energy change, and repeating an update process of updating or maintaining the value of the first neuron according to a result of determining whether to allow the update;
• calculating, by an arithmetic processing apparatus included in the optimization system, an initial value of the sum and the second change portion caused by an influence of a second neuron that is included in all the neurons but does not belong to the neuron group;
• and
• selecting, by a control apparatus included in the optimization system, the neuron group from all the neurons, transmitting to the arithmetic processing apparatus first data for calculating the second change portion and the initial value, receiving the initial value from the arithmetic processing apparatus, transmitting to the optimization apparatus the initial value and second data for calculating the first change portion, and receiving a value of the neuron group from the optimization apparatus.