离差最大化结合BP神经网络评价烟叶化学品质

张勇刚, 任志广, 徐志强, 刘建国, 张晓兵, 刘化冰, 夏琛, 程昌合

Chemical Quality Evaluation of Flue-Cured Tobacco Based on Maximization of Deviation and BP Neural Network

Zhang Yonggang, Ren Zhiguang, Xu Zhiqiang, Liu Jianguo, Zhang Xiaobing, Liu Huabing, Xia Chen, Cheng Changhe

表7 训练集和预测集的预测误差和决定系数

Table 7 Prediction error and determination coefficient of training and test samples

指标 Index 样本量 Sample size 平均绝 对误差 Mean of absolute error 平均相 对误差 Mean of relative error (%) R2 均方 根误差 Error of root-mean- square 训练集 Training sample 71 0.0038 0.6198 0.9985 0.0054 预测集 Test sample 24 0.0046 0.8514 0.9981 0.0057