Schwefel.evaluate() - Code Metrics - Inspection of "Functions description" - NiaOrg/NiaPy - Measure and Improve Code Quality continuously with Scrutinizer

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Pull Request — master (#23)

by Grega

created 2018-02-13 06:23 UTC

Schwefel.evaluate() A

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cc	2
c	1
b	0
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dl	0
loc	11
rs	9.4285

# encoding=utf8
# pylint: disable=anomalous-backslash-in-string
"""Implementation of Schwefel function.

Date: 2018

Author: Lucija Brezočnik

License: MIT

Function: Schwefel function

Input domain:
    The function can be defined on any input domain but it is usually
    evaluated on the hypercube x_i ∈ [-500, 500], for all i = 1, 2,..., D.

Global minimum:
    f(x*) = 0, at x* = (420.9687,...,420.9687)

LaTeX formats:
    Inline: $f(\textbf{x}) = 418.9829d - \sum_{i=1}^{D} x_i sin(\sqrt{|x_i|})$
    Equation: \begin{equation} f(\textbf{x}) =
              418.9829d - \sum_{i=1}^{D} x_i
              sin(\sqrt{|x_i|}) \end{equation}
    Domain: $-500 \leq x_i \leq 500$

Reference: https://www.sfu.ca/~ssurjano/schwef.html
"""

import math

__all__ = ['Schwefel']


class Schwefel(object):

    def __init__(self, Lower=-500, Upper=500):
        self.Lower = Lower
        self.Upper = Upper

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

            val = 0.0
            val1 = 0.0

            for i in range(D):
                val1 += (sol[i] * math.sin(math.sqrt(abs(sol[i]))))

            val = 418.9829 * D - val1

            return val

        return evaluate


1			# encoding=utf8
2			# pylint: disable=anomalous-backslash-in-string
3			"""Implementation of Schwefel function.
4
5			Date: 2018
6
7			Author: Lucija Brezočnik
8
9			License: MIT
10
11			Function: Schwefel function
12
13			Input domain:
14			The function can be defined on any input domain but it is usually
15			evaluated on the hypercube x_i ∈ [-500, 500], for all i = 1, 2,..., D.
16
17			Global minimum:
18			f(x) = 0, at x = (420.9687,...,420.9687)
19
20			LaTeX formats:
21			Inline: $f(\textbf{x}) = 418.9829d - \sum_{i=1}^{D} x_i sin(\sqrt{\|x_i\|})$
22			Equation: \begin{equation} f(\textbf{x}) =
23			418.9829d - \sum_{i=1}^{D} x_i
24			sin(\sqrt{\|x_i\|}) \end{equation}
25			Domain: $-500 \leq x_i \leq 500$
26
27			Reference: https://www.sfu.ca/~ssurjano/schwef.html
28			"""
29
30			import math
31
32			__all__ = ['Schwefel']
33
34
35			class Schwefel(object):
36
37			def __init__(self, Lower=-500, Upper=500):
38			self.Lower = Lower
39			self.Upper = Upper
40
41			@classmethod
42			def function(cls):
43			def evaluate(D, sol):
44
45			val = 0.0
46			val1 = 0.0
47
48			for i in range(D):
49			val1 += (sol[i] * math.sin(math.sqrt(abs(sol[i]))))
50
51			val = 418.9829 * D - val1
52
53			return val
54
55			return evaluate
56

NiaOrg / NiaPy

Pull Request — master (#23)

Schwefel.evaluate() A

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