基于整合移动平均自回归和遗传粒子群优化小波神经网络组合模型的交通流预测

Traffic Flow Prediction Based on Hybrid Model of Auto-Regressive Integrated Moving Average and Genetic Particle Swarm Optimization Wavelet Neural Network

针对短时交通流数据的非线性和随机性特点,为提高它的预测精度和收敛速度,该文从模型构建和算法两方面提出一种整合移动平均自回归(ARIMA)模型和遗传粒子群算法优化小波神经网络(GPSOWNN)相结合的预测模型和算法。在模型构建方面,将ARIMA模型预测值和灰色关联系数大于0.6的相关性强的前3个时刻的历史数据作为小波神经网络(WNN)的输入,在兼顾历史数据的平稳和非平稳的情况下,进行了模型结构简化。在算法方面,通过遗传粒子群算法对小波神经网络的参数初始值进行最优选取,可使其结果在不易陷入局部最优的条件下加快网络训练收敛速度。实验结果表明,在预测精度方面,该方法的模型明显优于整合移动平均自回归模型和遗传粒子群算法优化小波神经网络,在收敛速度方面,用遗传粒子群算法优化模型明显优于仅用遗传算法优化模型。

In view of the nonlinear and stochastic characteristics of short-term traffic flow data,this article proposes a prediction model and algorithm based on hybrid Auto-Regressive Integrated Moving Average(ARIMA)and Genetic Particle Swarm Optimization Wavelet Neural Network(GPSOWNN)in order to improve its prediction accuracy and rate of convergence.In terms of model construction,the ARIMA model prediction value and the historical data of the first three moments with strong correlation with gray correlation coefficient greater than 0.6 are used as input of the Wavelet Neural Network(WNN),and the structure of the model is simplified considering both the stationary and non-stationary historical data.In terms of algorithm,by using the genetic particle swarm optimization algorithm to select optimally the initial values of the wavelet neural network,the results can speed up the convergence of network training under the condition that it is not easy to fall into local optimum.The experimental results show that the proposed model is superior to hybrid ARIMA and GPSOWNN in terms of prediction accuracy,the genetic particle swarm optimization algorithm is superior to the genetic algorithm optimization model in terms of convergence speed.