TABLE II Mean and standard deviation of the approximation values of the solution sets obtained by the compared algorithms on a single-objective multi-tasking test suite. MTO PROBLEM CIHS TASK GRIEWANK RASTRIGIN CIMS ACKLEY RASTRIGIN CILS ACKLEY SCHWEFEL PIHS RASTRIGIN SPHERE PIMS ACKLEY ROSENBROCK PILS ACKLEY WEIERSTRASS NIHS ROSENBROCK RASTRIGIN NIMS GRIEWANK WEIERSTRAS NILS RASTRIGIN SCHWEFEL MFEA 3.65E-01+ (6.73E-02) 1.81E+02+ (4.67E+01) 4.47E+00+ (7.16E-01) 2.19E+02+ (5.88E+01) 2.02E+01+ (5.28E-02) 3.69E+03+ (6.11E+02) 5.52E+02+ (9.41E+01) 8.37E+00+ (1.94E+00) 3.65E+00+ (8.93E-01) 6.80E+02+ (3.44E+02) 2.01E+01+ (1.08E-01) 1.99E+01+ (2.34E+00) 8.21E+02+ (2.29E+02) 2.55E+02+ (6.90E+01) 4.08E-01+ (9.99E-02) 2.82E+01+ (2.24E+00) 6.03E+02+ (1.18E+02) 3.68E+03+ (5.80E+02) MFEA-GS VS. MFEA MFEA-GSMT VS. MFEA-MT MFEA-MT VS. MFEA MFEA-MT VS. MFEA-OBL MFEA-GSMT VS. MFEA-GS BETTER 18 8 15 17 7 MFEA-OBL 1.08E-01+ (1.56E-01) 7.96E+01+ (1.02E+02) 1.11E+00+ (1.41E+00) 9.62E+01+ (1.04E+02) 2.03E+01+ (1.00E-01) 4.60E+03+ (5.02E+02) 4.31E+02+ (9.76E+01) 2.02E+01+ (4.71E+00) 3.67E+00+ (4.45E-01) 6.26E+02+ (3.61E+02) 1.92E+01+ (4.52E+00) 2.13E+01+ (5.59E+00) 6.13E+02+ (3.23E+02) 2.19E+02+ (5.73E+01) 6.28E-01+ (7.36E-02) 2.48E+01+ (3.66E+00) 4.07E+02+ (1.19E+02) 4.38E+03+ (5.07E+02) SIMILAR TO 10 1 1 9 PERFORMANCE MFEA-GS 0.00E+00 . (0.00E+00) 0.00E+00 . (0.00E+00) 3.92E-13+ (1.04E-12) 0.00E+00 . (0.00E+00) 2.80E-06 . (6.75E-06) 6.36E-04 . (1.62E-09) 3.58E+00+ (1.60E+01) 1.29E-02 . (1.96E-02) 1.02E+00 - (1.10E-01) 4.16E+01 . (1.43E+01) 1.37E-06+ (3.86E-06) 1.54E-06+ (6.87E-06) 4.62E+01 . (4.52E-01) 2.80E-09+ (6.19E-09) 4.18E-04 - (9.46E-04) 1.50E+00+ (1.11E+00) 5.80E+01+ (5.80E+01) 1.93E+03 . (1.61E+03) WORSE 2 2 MFEA-MT 0.00E+00 . (0.00E+00) 0.00E+00 . (0.00E+00) 8.88E-16 . (0.00E+00) 0.00E+00 . (0.00E+00) 2.02E+01+ (7.59E-02) 3.84E+03+ (6.76E+02) 0.00E+00 . (2.94E+01) 3.96E+00+ (1.18E+00) 2.66E+00+ (1.33E-01) 4.85E+01+ (1.76E-01) 8.88E-16 . (0.00E+00) 0.00E+00 . (0.00E+00) 4.67E+01+ (5.11E-01) 0.00E+00 . (0.00E+00) 3.21E-01+ (5.71E-02) 0.00E+00 . (0.00E+00) 9.39E+00 . (3.15E+01) 4.13E+03+ (4.97E+02) MFEA-GSMT 0.00E+00 (0.00E+00) 0.00E+00 (0.00E+00) 8.88E-16 (0.00E+00) 0.00E+00 (0.00E+00) 6.91E-06 (2.14E-05) 6.36E-04 (1.54E-09) 0.00E+00 (0.00E+00) 4.14E-03 (6.84E-03) 1.54E+00 (4.19E-01) 4.62E+01 (5.96E-01) 8.88E-16 (0.00E+00) 0.00E+00 (0.00E+00) 4.61E+01 (3.71E-01) 0.00E+00 (0.00E+00) 1.69E-03 (1.94E-03) 0.00E+00 (0.00E+00) 0.00E+00 (0.00E+00) 2.40E+03 (2.24E+03) NOVEMBER 2021 | IEEE COMPUTATIONAL INTELLIGENCE MAGAZINE 49