Research Article

An Evolutionary Algorithm with Clustering-Based Assisted Selection Strategy for Multimodal Multiobjective Optimization

Table 3

Results obtained by four other MMOEAs and MMOEA-CAS on IGDX.

BenchmarkOmnioptimizerDN-NSGA-IIMO-Ring-PSO-SCDTriMOEA-TA&RMMOEA-CAS

SYM-PART simple5.558e + 00 (2.61e + 00)−3.810e + 00 (9.39e−01)−1.663e−01 (2.19e−02)−2.181e02 (3.01e03) + 7.633e−02 (4.92e−03)
SYM-PART rotated4.405e + 00 (1.22e + 00)−4.613e + 00 (1.99e + 00)−1.972e01 (3.50e02)+1.674e + 00 (9.48e−01)−4.240e−01 (6.09e−01)
Omnitest1.501e + 00 (2.29e−01)−1.410e + 00 (2.10e−01)−4.057e−01 (8.74e−02)−2.536e−01 (1.09e−01)−1.092e01 (3.23e03)
MMF19.905e−02 (1.81e−02)−9.963e−02 (1.70e−02)−4.951e02 (2.06e03)+7.290e−02 (8.54e−03)−5.350e−02 (5.06e−03)
MMF1_z7.949e−02 (1.57e−02)−7.898e−02 (1.01e−02)−3.576e02 (2.13e03)+7.040e−02 (1.17e−02)−5.593e−02 (6.27e−03)
MMF1_e1.314e + 00 (7.26e−01)∼1.055e + 00 (4.70e−01)∼5.709e01 (2.57e01)+1.940e + 00 (7.07e−01)−1.074e + 00 (2.73e−01)
MMF21.266e−01 (1.01e−01)−1.389e−01 (8.51e−02)−3.802e−02 (1.72e−02)∼7.150e−02 (2.82e−02)−3.370e02 (1.36e02)
MMF39.213e−02 (4.50e−02)−9.220e−02 (3.53e−02)−3.164e02 (1.19e02)+9.315e−02 (3.98e−02)−4.730e−02 (1.46e−02)
MMF48.358e−02 (2.70e−02)−8.963e−02 (2.55e−02)−2.705e−02 (1.71e−03)−1.008e−01 (1.43e−01)−2.221e02 (1.91e03)
MMF51.763e−01 (2.39e−02)−1.703e−01 (2.06e−02)−8.615e02 (5.66e03)1.114e−01 (8.42e−03)−8.754e−02 (8.77e−03)
MMF61.441e−01 (1.68e−02)−1.471e−01 (1.66e−02)−7.260e02 (3.87e03)+9.006e−02 (9.24e−03) + 1.136e−01 (2.14e−02)
MMF74.629e−02 (9.25e−03)−5.681e−02 (1.40e−02)−2.610e−02 (1.54e−03)−4.468e−02 (2.13e−02)−2.428e02 (3.96e03)
MMF83.286e−01 (1.65e−01)−3.012e−01 (9.95e−02)−6.719e02 (5.03e03)+3.438e−01 (1.04e−01)−1.448e−01 (3.29e−02)
MMF92.200e−02 (1.09e−02)−2.529e−02 (1.32e−02)−7.882e−03 (3.55e−04)+3.124e03 (9.15e05) + 8.759e−03 (1.30e−03)
MMF101.646e−01 (3.31e−02)−1.617e−01 (4.48e−02)−1.004e−01 (3.69e−02)−2.014e−01 (7.52e−05)−2.755e02 (4.78e02)
MMF112.502e−01 (3.58e−04)−2.505e−01 (4.85e−04)−2.169e−01 (2.72e−02)−2.524e−01 (5.79e−05)−9.196e03 (1.25e03)
MMF122.396e−01 (1.68e−02)−2.467e−01 (9.44e−04)−1.875e−01 (4.53e−02)−2.477e−01 (6.84e−04)−3.120e03 (1.84e04)
MMF132.858e−01 (9.42e−03)−2.895e−01 (1.54e−02)−2.325e−01 (1.43e−02)−2.714e−01 (6.55e−03)−1.055e01 (1.46e02)
MMF148.873e−02 (6.29e−03)−9.794e−02 (9.76e−03)−5.329e−02 (1.86e−03)−3.651e02 (4.92e04) + 4.651e−02 (1.11e−03)
MMF14_a1.110e−01 (9.66e−03)−1.196e−01 (5.83e−03)−5.997e−02 (1.97e−03)+5.604e02 (1.59e03) + 7.757e−02 (4.54e−03)
MMF152.471e−01 (2.10e−02)−2.238e−01 (2.59e−02)−1.562e−01 (1.63e−02)−2.711e−01 (2.53e−04)−5.256e02 (7.43e03)
MMF15_a2.133e−01 (1.99e−02)−2.086e−01 (1.46e−02)−1.641e−01 (1.31e−02)−2.194e−01 (2.83e−03)−9.684e02 (6.43e03)
best/all0/220/228/224/2210/22
+/–/∼0/21/10/21/19/11/25/17/0– –

Wilcoxon’s rank-sum test () is used for experimental comparison where +, −, and = represent that the performance of the results obtained by competitors is better, worse, or similar.