Algorithm 4: Knowledge Transfer of DE

Input: pt: a parent from target task.    popt: the population of target task.    pops: the population of source task.

Output: c: the offspring generated.

Begin

1:  Select one individual xr1 from popt randomly and xr1! = pt.

2:  Select two individuals xr2, xr3 from pops randomly and xr2! = xr3.

3:  According to Formula (1) to generate mutated individual vi.

4:  According to Formula (2) to generate offspring c.

End