Ackley.function()

Complexity

Conditions

3

Size

Total Lines

24

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

1 Method

Rating	Name	Duplication	Size	Complexity
A	Ackley.evaluate()	0	20	2

"""Implementation of Ackley function."""
import math

__all__ = ['Ackley']


class Ackley(object):

    @classmethod
    def function(cls):
        def evaluate(D, sol):

            a = 20 # Recommended variable value
            b = 0.2 # Recommended variable value
            c = 2*math.pi # Recommended variable value

            val = 0.0
            val1 = 0.0
            val2 = 0.0

            for i in range(D):
                val1 += math.pow(sol[i], 2)
                val2 += math.cos(c*sol[i])

            temp1 = -b*math.sqrt(val1/D)
            temp2 = val2/D

            val = -a*math.exp(temp1)-math.exp(temp2)+a+math.exp(1)

            return val

        return evaluate