Prediction of Pareto Dominance Using Nearest Neighbor Method Based on Decision Space Transformation
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摘要: 为提高在决策空间运用最近邻方法预测多目标优化Pareto支配性的精度，提出一种基于决策空间变换的最近邻预测方法.在分析目标函数与决策分量相关性的基础上，提出属性变化趋势模型的构造方法，建立低计算成本的属性趋势代理模型.通过属性趋势模型引入决策空间到目标空间的映射知识，对多目标问题的决策空间进行变换，使决策空间的最近邻更有效反映目标空间的最近邻.选取具有不同相关系数特征的典型多目标优化问题，进行Pareto支配性预测的可对比实验，结果表明在新空间中运用最近邻方法可显著提高分类准确性.Abstract: In this paper, nearest neighbor prediction is used to decide Pareto dominance of candidate solutions in expensive multi-objective optimization. For improving the accuracy of predicting Pareto dominance in decision space, a transformation method of decision space is proposed. Based on correlation analysis of objective functions and decision attributes, computationally efficient attribute tendency models of objective functions are set up. These models are used to re-construct the decision space such that the knowledge of objective space is introduced and the neighborhood relation in decision space can more effectively reflect that in the original objective space. Experiments of Pareto dominance prediction are carried out on a group of typical multi-objective optimization problems. The results indicate that the prediction of Pareto dominance using the proposed method is more accurate and efficient than the existing methods.
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Key words:
- Tendency model /
- space transformation /
- nearest neighbor method /
- Pareto dominance
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图 1 决策空间的线性化过程(圆点表示原样本点的分布, 三角表示经过趋势模型$y=g (x_i)$映射后的样本点
Fig. 1 The linearization process of decision space (Circles are the original sample points and triangles are the mapped sample points by the trend model $y=g (x_i)$.)
表 1 测试函数的决策属性与目标属性的相关系数
Table 1 Correlation coefficient of decision attribute and objective attribute of test function
测试函数 f1 (x) f2 (x) f3 (x) ZDT1 n=10 (1, 0, 0, 0, …) (-0.59, 0.27, 0.27, 0.27, …) n=30 (1, 0, 0, 0, …) (-0.79, 0.11, 0.11, 0.11, …) ZDT3 n=3 (1, 0, 0) (-0.28, 0.65, 0.65) n=10 (1, 0, 0, 0, …) (-0.49, 0.25, 0.25, …) ZDT6 n=3 (0.47, 0, 0) (0.02, 0.69, 0.69) n=10 (0.48, 0, 0, 0, …) (0.02, 0.69, 0.69) KUR n=3 (0.02, 0, -0.01) (0.02, 0.02, 0.02) UF1 n=15 (0.92, 0, -0.07, 0, -0.07, 0, …) (-0.51, -0.11, 0, -0.12, …) DTLZ2 n=10 (-0.64, -0.64, 0.01, -0.01, …) (-0.64, 0.64, 0.01, 0.01, …) (0.94, 0, 0, 0.01, 0, …) DTLZ4 n=10 (-0.64, -0.64, 0.01, -0.01, …) (-0.64, 0.64, 0.01, 0, -0.01, …) (0.94, -0.01, 0, 0.01, 0, …) 
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表 2 变换前后的最近邻分类误差
Table 2 Nearest neighbor classification error before and after transformation
测试函数 按目标分类的误差均值 按目标分类的最大误差 f1 (x) f2 (x) f3 (x) f1 (x) f2 (x) f3 (x) ZDT1 原空间 0.1516 0.4302 0.5115 1.3159 变换后 0.0013 0.1725 0.0074 0.9304 ZDT3 原空间 0.0437 0.446 0.1837 1.7126 变换后 0.0011 0.3282 0.0042 1.5289 ZDT6 原空间 0.1047 0.1873 0.6864 1.8303 变换后 0.0031 0.0765 0.0454 0.4374 KUR 原空间 0.6601 5.7885 2.2948 23.423 变换后 0.2909 1.6843 1.6411 4.6841 UF1 原空间 0.1985 0.1753 0.8847 1.0659 变换后 0.0753 0.068 0.2736 0.4554 DTLZ2 原空间 0.2314 0.2368 0.2344 1.0053 0.8732 1.0964 变换后 0.0624 0.0569 0.0471 0.3102 0.1942 0.199 DTLZ4 原空间 0.2072 0.2431 0.2459 0.8283 0.7537 0.895 变换后 0.0582 0.0724 0.0488 0.2478 0.2178 0.0488
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表 3 Pareto支配性预测的平均精度
Table 3 Average precision of Pareto dominance prediction
测试函数 方法 n Pareto支配性(%) 总体正确 非支配类 支配类 不可比类 ZDT1 DSTNN 10 92.32 81.7 88.61 96.64 ENNC 64.79 40.58 42.3 74.88 ESNNC 83.23 70.32 75.24 88.31 GP 88.76 65.55 65.55 90.21 DSTNN 30 90.85 71.2 81.51 95.2 ENNC 54.32 17.36 23.26 63.41 ESNNC 68.9 37.49 40.28 80.54 GP 73.41 32.97 32.97 84.49 ZDT3 DSTNN 3 93.13 80.47 93.14 97.19 ENNC 76.84 75.54 69.03 79.2 ESNNC 68.82 56.95 68.85 72.26 GP 57.73 54.6 54.6 59.48 DSTNN 10 83.29 71.53 77.56 88.69 ENNC 59.33 34.81 38.61 70.03 ESNNC 77.86 72.05 66.85 84.12 GP 71.1 54.2 54.2 78.56 ZDT6 DSTNN 3 95.94 89.83 95.59 99.36 ENNC 53.68 42.23 48.88 55.9 ESNNC 49.78 43.06 49.49 52.97 GP 52.96 36.92 36.92 66.89 DSTNN 10 91.43 87.77 93.58 92.33 ENNC 44.3 37.8 47.55 46.1 ESNNC 64.86 66.12 60.53 66.44 GP 48.88 47.03 47.03 50.82 DTLZ2 DSTNN 10 86.49 43.89 66.87 89.66 ENNC 54.89 17.24 17.42 58.87 ESNNC 90.92 22.68 28.41 95.31 GP 89.5 12 12 96.75 DTLZ4 DSTNN 10 85.39 50.14 74.64 88.55 ENNC 53.74 16.93 20.42 57.23 ESNNC 72.23 48.38 44.56 79.99 GP 70.87 9.51 9.51 76.65 UF1 DSTNN 10 86.14 71.9 84.17 91.64 ENNC 60.08 54.86 50.23 65.76 ESNNC 60.84 65.23 70.69 71.49 GP 57.7 61.53 61.53 51.61 KUR DSTNN 3 85.43 79.73 86.79 89.87 ENNC 46.47 53.95 56.71 34.54 ESNNC 50.73 52.88 55.39 45.02 GP 44.19 41.79 41.79 47.76
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