GA-BP神经网络及其在液体乳安全评价中的应用

利用遗传算法（Genetic Algorithm,GA）优化BP（Back Propagation,BP）神经网络的初始权值、阈值,以期加快网络收敛,提高预测精度。以乳制品中的液体乳为实验材料,建立安全评价指标体系;将优化后的GA-BP神经网络作为评价模型,对液体乳的日常检测数据进行拟合;以测试数据作为验证,检测模型的收敛速度和拟合度。结果表明GA-BP较BP神经网络来讲更稳定,能较快收敛,且仿真误差较小;在隐层节点数为9时,GA-BP神经网络对液体乳的拟合效果最好,预测精度较高,是一种可行的液体乳安全状况评价方法。 

GA-BP neural network and its application in safety evaluation of liquid milk

The initial weights and thresholds of back propagation ( BP) neural network were optimized by genetic algorithm ( GA) to accelerate the network convergence and improve the prediction precision.The liquid milk in dairy products was used as the experimental material to establish the safety evaluation index system. The GA-BP neural network was used as the evaluation model to fit the daily data of liquid milk.The convergence rate and the fitting degree of the model were verified by the test data.The results showed that GA-BP was more stable than BP neural network and could converge quickly, and the simulation error of GA-BP neural network was smaller.When the number of nodes was 9, GA-BP neural network had the best fitting effect to liquid milk, and the prediction precision was high. So GA-BP neural network was a feasible method to evaluate the safety of liquid milk.