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Pull Request — master (#21)
by Grega
01:03
created

Ackley.evaluate()   A

↳ Parent: Ackley.function()

Complexity

Conditions 2

Size

Total Lines 20

Duplication

Lines 0
Ratio 0 %

Importance

Changes 3
Bugs 2 Features 0
Metric Value
c 3
b 2
f 0
dl 0
loc 20
rs 9.4285
cc 2
1 
"""Implementation of Ackley function."""
2 
import math
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__all__ = ['Ackley']

            


            
                                                                                                            
                            
            
                                    
            
            

                
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class Ackley(object):

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    def __init__(self, Lower=-100, Upper=100):

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        self.Lower = Lower

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        self.Upper = Upper

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    @classmethod

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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    def function(cls):

            


            
                                                                        
                            
            
                                    
            
            

                
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        def evaluate(D, sol):

            


            
                                                                        
                            
            
                                    
            
            

                
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            a = 20  # Recommended variable value

            


            
                                                                        
                            
            
                                    
            
            

                
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            b = 0.2  # Recommended variable value

            


            
                                                                        
                            
            
                                    
            
            

                
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            c = 2 * math.pi  # Recommended variable value

            


            
                                                                        
                            
            
                                    
            
            

                
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            val = 0.0

            


            
                                                                        
                            
            
                                    
            
            

                
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            val1 = 0.0

            


            
                                                                        
                            
            
                                    
            
            

                
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            val2 = 0.0

            


            
                                                                        
                            
            
                                    
            
            

                
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            for i in range(D):

            


            
                                                                        
                            
            
                                    
            
            

                
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                val1 += math.pow(sol[i], 2)

            


            
                                                                        
                            
            
                                    
            
            

                
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                val2 += math.cos(c * sol[i])

            


            
                                                                        
                            
            
                                    
            
            

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

            


            
                                                                        
                            
            
                                    
            
            

                
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            temp2 = val2 / D

            


            
                                                                        
                            
            
                                    
            
            

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

            


            
                                                                        
                            
            
                                    
            
            

                
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            return val

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        return evaluate

            


            
                                                        
            
                                    
            
            

                
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