CIHS T1 CIHS T2 10 -40 -30 -20 -10 01 2345 Number of Function Evaluations ×104 CILS T1 -15 -10 -5 5 01 2345 Number of Function Evaluations ×104 PIMS T1 1 2 3 4 012345 Number of Function Evaluations ×104 NIHS T1 10 15 20 25 -5 5 01 2345 Number of Function Evaluations ×104 10 -40 -30 -20 -10 01 2345 Number of Function Evaluations ×104 SOEA MFEA MFEA-II MFEA/GHS MFEA-GSMT 10 15 20 25 5 012345 Number of Function Evaluations ×104 NIHS T2 10 -10 -5 5 01 2345 Number of Function Evaluations ×104 PIMS T2 10 -40 -30 -20 -10 01 2345 Number of Function Evaluations ×104 CILS T2 FIGURE 4 Plot of the average convergence trend of the compared algorithms on the single-objective multi-tasking test suite. (Continued) NOVEMBER 2021 | IEEE COMPUTATIONAL INTELLIGENCE MAGAZINE 47 Objective (Log Scale) Objective (Log Scale) Objective (Log Scale) Objective (Log Scale) Objective (Log Scale) Objective (Log Scale) Objective (Log Scale) Objective (Log Scale)