720 lines
20 KiB
Python
720 lines
20 KiB
Python
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# -*- coding: utf-8 -*-
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from numpy import (abs, asarray, cos, exp, log, arange, pi, prod, sin, sqrt,
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sum, tan)
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from .go_benchmark import Benchmark, safe_import
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with safe_import():
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from scipy.special import factorial
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class Matyas(Benchmark):
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r"""
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Matyas objective function.
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This class defines the Matyas [1]_ global optimization problem. This is a
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multimodal minimization problem defined as follows:
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.. math::
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f_{\text{Matyas}}(x) = 0.26(x_1^2 + x_2^2) - 0.48 x_1 x_2
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with :math:`x_i \in [-10, 10]` for :math:`i = 1, 2`.
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*Global optimum*: :math:`f(x) = 0` for :math:`x = [0, 0]`
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.. [1] Jamil, M. & Yang, X.-S. A Literature Survey of Benchmark Functions
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For Global Optimization Problems Int. Journal of Mathematical Modelling
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and Numerical Optimisation, 2013, 4, 150-194.
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"""
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def __init__(self, dimensions=2):
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Benchmark.__init__(self, dimensions)
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self._bounds = list(zip([-10.0] * self.N, [10.0] * self.N))
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self.global_optimum = [[0 for _ in range(self.N)]]
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self.fglob = 0.0
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def fun(self, x, *args):
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self.nfev += 1
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return 0.26 * (x[0] ** 2 + x[1] ** 2) - 0.48 * x[0] * x[1]
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class McCormick(Benchmark):
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r"""
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McCormick objective function.
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This class defines the McCormick [1]_ global optimization problem. This is a
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multimodal minimization problem defined as follows:
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.. math::
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f_{\text{McCormick}}(x) = - x_{1} + 2 x_{2} + \left(x_{1}
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- x_{2}\right)^{2} + \sin\left(x_{1} + x_{2}\right) + 1
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with :math:`x_1 \in [-1.5, 4]`, :math:`x_2 \in [-3, 4]`.
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*Global optimum*: :math:`f(x) = -1.913222954981037` for
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:math:`x = [-0.5471975602214493, -1.547197559268372]`
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.. [1] Jamil, M. & Yang, X.-S. A Literature Survey of Benchmark Functions
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For Global Optimization Problems Int. Journal of Mathematical Modelling
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and Numerical Optimisation, 2013, 4, 150-194.
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"""
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def __init__(self, dimensions=2):
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Benchmark.__init__(self, dimensions)
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self._bounds = [(-1.5, 4.0), (-3.0, 3.0)]
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self.global_optimum = [[-0.5471975602214493, -1.547197559268372]]
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self.fglob = -1.913222954981037
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def fun(self, x, *args):
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self.nfev += 1
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return (sin(x[0] + x[1]) + (x[0] - x[1]) ** 2 - 1.5 * x[0]
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+ 2.5 * x[1] + 1)
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class Meyer(Benchmark):
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r"""
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Meyer [1]_ objective function.
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..[1] https://www.itl.nist.gov/div898/strd/nls/data/mgh10.shtml
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TODO NIST regression standard
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"""
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def __init__(self, dimensions=3):
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Benchmark.__init__(self, dimensions)
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self._bounds = list(zip([0., 100., 100.],
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[1, 1000., 500.]))
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self.global_optimum = [[5.6096364710e-3, 6.1813463463e3,
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3.4522363462e2]]
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self.fglob = 8.7945855171e1
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self.a = asarray([3.478E+04, 2.861E+04, 2.365E+04, 1.963E+04, 1.637E+04,
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1.372E+04, 1.154E+04, 9.744E+03, 8.261E+03, 7.030E+03,
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6.005E+03, 5.147E+03, 4.427E+03, 3.820E+03, 3.307E+03,
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2.872E+03])
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self.b = asarray([5.000E+01, 5.500E+01, 6.000E+01, 6.500E+01, 7.000E+01,
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7.500E+01, 8.000E+01, 8.500E+01, 9.000E+01, 9.500E+01,
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1.000E+02, 1.050E+02, 1.100E+02, 1.150E+02, 1.200E+02,
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1.250E+02])
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def fun(self, x, *args):
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self.nfev += 1
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vec = x[0] * exp(x[1] / (self.b + x[2]))
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return sum((self.a - vec) ** 2)
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class Michalewicz(Benchmark):
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r"""
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Michalewicz objective function.
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This class defines the Michalewicz [1]_ global optimization problem. This
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is a multimodal minimization problem defined as follows:
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.. math::
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f_{\text{Michalewicz}}(x) = - \sum_{i=1}^{2} \sin\left(x_i\right)
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\sin^{2 m}\left(\frac{i x_i^{2}}{\pi}\right)
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Where, in this exercise, :math:`m = 10`.
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with :math:`x_i \in [0, \pi]` for :math:`i = 1, 2`.
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*Global optimum*: :math:`f(x_i) = -1.8013` for :math:`x = [0, 0]`
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.. [1] Adorio, E. MVF - "Multivariate Test Functions Library in C for
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Unconstrained Global Optimization", 2005
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TODO: could change dimensionality, but global minimum might change.
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"""
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def __init__(self, dimensions=2):
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Benchmark.__init__(self, dimensions)
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self._bounds = list(zip([0.0] * self.N, [pi] * self.N))
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self.global_optimum = [[2.20290555, 1.570796]]
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self.fglob = -1.8013
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def fun(self, x, *args):
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self.nfev += 1
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m = 10.0
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i = arange(1, self.N + 1)
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return -sum(sin(x) * sin(i * x ** 2 / pi) ** (2 * m))
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class MieleCantrell(Benchmark):
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r"""
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Miele-Cantrell [1]_ objective function.
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This class defines the Miele-Cantrell global optimization problem. This
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is a multimodal minimization problem defined as follows:
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.. math::
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f_{\text{MieleCantrell}}({x}) = (e^{-x_1} - x_2)^4 + 100(x_2 - x_3)^6
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+ \tan^4(x_3 - x_4) + x_1^8
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with :math:`x_i \in [-1, 1]` for :math:`i = 1, ..., 4`.
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*Global optimum*: :math:`f(x) = 0` for :math:`x = [0, 1, 1, 1]`
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.. [1] Jamil, M. & Yang, X.-S. A Literature Survey of Benchmark Functions
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For Global Optimization Problems Int. Journal of Mathematical Modelling
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and Numerical Optimisation, 2013, 4, 150-194.
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"""
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def __init__(self, dimensions=4):
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Benchmark.__init__(self, dimensions)
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self._bounds = list(zip([-1.0] * self.N, [1.0] * self.N))
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self.global_optimum = [[0.0, 1.0, 1.0, 1.0]]
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self.fglob = 0.0
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def fun(self, x, *args):
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self.nfev += 1
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return ((exp(-x[0]) - x[1]) ** 4 + 100 * (x[1] - x[2]) ** 6
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+ tan(x[2] - x[3]) ** 4 + x[0] ** 8)
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class Mishra01(Benchmark):
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r"""
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Mishra 1 objective function.
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This class defines the Mishra 1 [1]_ global optimization problem. This
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is a multimodal minimization problem defined as follows:
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.. math::
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f_{\text{Mishra01}}(x) = (1 + x_n)^{x_n}
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where
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.. math::
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x_n = n - \sum_{i=1}^{n-1} x_i
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with :math:`x_i \in [0, 1]` for :math:`i =1, ..., n`.
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*Global optimum*: :math:`f(x) = 2` for :math:`x_i = 1` for
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:math:`i = 1, ..., n`
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.. [1] Jamil, M. & Yang, X.-S. A Literature Survey of Benchmark Functions
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For Global Optimization Problems Int. Journal of Mathematical Modelling
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and Numerical Optimisation, 2013, 4, 150-194.
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"""
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def __init__(self, dimensions=2):
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Benchmark.__init__(self, dimensions)
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self._bounds = list(zip([0.0] * self.N,
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[1.0 + 1e-9] * self.N))
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self.global_optimum = [[1.0 for _ in range(self.N)]]
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self.fglob = 2.0
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self.change_dimensionality = True
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def fun(self, x, *args):
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self.nfev += 1
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xn = self.N - sum(x[0:-1])
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return (1 + xn) ** xn
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class Mishra02(Benchmark):
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r"""
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Mishra 2 objective function.
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This class defines the Mishra 2 [1]_ global optimization problem. This
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is a multimodal minimization problem defined as follows:
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.. math::
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f_{\text{Mishra02}}({x}) = (1 + x_n)^{x_n}
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with
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.. math::
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x_n = n - \sum_{i=1}^{n-1} \frac{(x_i + x_{i+1})}{2}
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Here, :math:`n` represents the number of dimensions and
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:math:`x_i \in [0, 1]` for :math:`i = 1, ..., n`.
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*Global optimum*: :math:`f(x) = 2` for :math:`x_i = 1`
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for :math:`i = 1, ..., n`
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.. [1] Jamil, M. & Yang, X.-S. A Literature Survey of Benchmark Functions
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For Global Optimization Problems Int. Journal of Mathematical Modelling
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and Numerical Optimisation, 2013, 4, 150-194.
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"""
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def __init__(self, dimensions=2):
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Benchmark.__init__(self, dimensions)
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self._bounds = list(zip([0.0] * self.N,
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[1.0 + 1e-9] * self.N))
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self.global_optimum = [[1.0 for _ in range(self.N)]]
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self.fglob = 2.0
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self.change_dimensionality = True
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def fun(self, x, *args):
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self.nfev += 1
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xn = self.N - sum((x[:-1] + x[1:]) / 2.0)
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return (1 + xn) ** xn
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class Mishra03(Benchmark):
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r"""
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Mishra 3 objective function.
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This class defines the Mishra 3 [1]_ global optimization problem. This
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is a multimodal minimization problem defined as follows:
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.. math::
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f_{\text{Mishra03}}(x) = \sqrt{\lvert \cos{\sqrt{\lvert x_1^2
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+ x_2^2 \rvert}} \rvert} + 0.01(x_1 + x_2)
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with :math:`x_i \in [-10, 10]` for :math:`i = 1, 2`.
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*Global optimum*: :math:`f(x) = -0.1999` for
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:math:`x = [-9.99378322, -9.99918927]`
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.. [1] Jamil, M. & Yang, X.-S. A Literature Survey of Benchmark Functions
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For Global Optimization Problems Int. Journal of Mathematical Modelling
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and Numerical Optimisation, 2013, 4, 150-194.
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TODO: I think that Jamil#76 has the wrong global minimum, a smaller one
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is possible
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"""
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def __init__(self, dimensions=2):
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Benchmark.__init__(self, dimensions)
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self._bounds = list(zip([-10.0] * self.N, [10.0] * self.N))
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self.global_optimum = [[-9.99378322, -9.99918927]]
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self.fglob = -0.19990562
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def fun(self, x, *args):
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self.nfev += 1
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return ((0.01 * (x[0] + x[1])
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+ sqrt(abs(cos(sqrt(abs(x[0] ** 2 + x[1] ** 2)))))))
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class Mishra04(Benchmark):
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r"""
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Mishra 4 objective function.
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This class defines the Mishra 4 [1]_ global optimization problem. This is a
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multimodal minimization problem defined as follows:
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.. math::
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f_{\text{Mishra04}}({x}) = \sqrt{\lvert \sin{\sqrt{\lvert
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x_1^2 + x_2^2 \rvert}} \rvert} + 0.01(x_1 + x_2)
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with :math:`x_i \in [-10, 10]` for :math:`i = 1, 2`.
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*Global optimum*: :math:`f(x) = -0.17767` for
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:math:`x = [-8.71499636, -9.0533148]`
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.. [1] Jamil, M. & Yang, X.-S. A Literature Survey of Benchmark Functions
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For Global Optimization Problems Int. Journal of Mathematical Modelling
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and Numerical Optimisation, 2013, 4, 150-194.
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TODO: I think that Jamil#77 has the wrong minimum, not possible
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"""
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def __init__(self, dimensions=2):
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Benchmark.__init__(self, dimensions)
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self._bounds = list(zip([-10.0] * self.N, [10.0] * self.N))
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self.global_optimum = [[-8.88055269734, -8.89097599857]]
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self.fglob = -0.177715264826
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|
|
|
||
|
|
def fun(self, x, *args):
|
||
|
|
self.nfev += 1
|
||
|
|
|
||
|
|
return ((0.01 * (x[0] + x[1])
|
||
|
|
+ sqrt(abs(sin(sqrt(abs(x[0] ** 2 + x[1] ** 2)))))))
|
||
|
|
|
||
|
|
|
||
|
|
class Mishra05(Benchmark):
|
||
|
|
|
||
|
|
r"""
|
||
|
|
Mishra 5 objective function.
|
||
|
|
|
||
|
|
This class defines the Mishra 5 [1]_ global optimization problem. This is a
|
||
|
|
multimodal minimization problem defined as follows:
|
||
|
|
|
||
|
|
.. math::
|
||
|
|
|
||
|
|
f_{\text{Mishra05}}(x) = \left [ \sin^2 ((\cos(x_1) + \cos(x_2))^2)
|
||
|
|
+ \cos^2 ((\sin(x_1) + \sin(x_2))^2) + x_1 \right ]^2 + 0.01(x_1 + x_2)
|
||
|
|
|
||
|
|
|
||
|
|
with :math:`x_i \in [-10, 10]` for :math:`i = 1, 2`.
|
||
|
|
|
||
|
|
*Global optimum*: :math:`f(x) = -0.119829` for :math:`x = [-1.98682, -10]`
|
||
|
|
|
||
|
|
.. [1] Mishra, S. Global Optimization by Differential Evolution and
|
||
|
|
Particle Swarm Methods: Evaluation on Some Benchmark Functions.
|
||
|
|
Munich Personal RePEc Archive, 2006, 1005
|
||
|
|
|
||
|
|
TODO Line 381 in paper
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, dimensions=2):
|
||
|
|
Benchmark.__init__(self, dimensions)
|
||
|
|
|
||
|
|
self._bounds = list(zip([-10.0] * self.N, [10.0] * self.N))
|
||
|
|
|
||
|
|
self.global_optimum = [[-1.98682, -10.0]]
|
||
|
|
self.fglob = -1.019829519930646
|
||
|
|
|
||
|
|
def fun(self, x, *args):
|
||
|
|
self.nfev += 1
|
||
|
|
|
||
|
|
return (0.01 * x[0] + 0.1 * x[1]
|
||
|
|
+ (sin((cos(x[0]) + cos(x[1])) ** 2) ** 2
|
||
|
|
+ cos((sin(x[0]) + sin(x[1])) ** 2) ** 2 + x[0]) ** 2)
|
||
|
|
|
||
|
|
|
||
|
|
class Mishra06(Benchmark):
|
||
|
|
|
||
|
|
r"""
|
||
|
|
Mishra 6 objective function.
|
||
|
|
|
||
|
|
This class defines the Mishra 6 [1]_ global optimization problem. This
|
||
|
|
is a multimodal minimization problem defined as follows:
|
||
|
|
|
||
|
|
.. math::
|
||
|
|
|
||
|
|
f_{\text{Mishra06}}(x) = -\log{\left [ \sin^2 ((\cos(x_1)
|
||
|
|
+ \cos(x_2))^2) - \cos^2 ((\sin(x_1) + \sin(x_2))^2) + x_1 \right ]^2}
|
||
|
|
+ 0.01 \left[(x_1 -1)^2 + (x_2 - 1)^2 \right]
|
||
|
|
|
||
|
|
|
||
|
|
with :math:`x_i \in [-10, 10]` for :math:`i = 1, 2`.
|
||
|
|
|
||
|
|
*Global optimum*: :math:`f(x_i) = -2.28395` for :math:`x = [2.88631, 1.82326]`
|
||
|
|
|
||
|
|
.. [1] Mishra, S. Global Optimization by Differential Evolution and
|
||
|
|
Particle Swarm Methods: Evaluation on Some Benchmark Functions.
|
||
|
|
Munich Personal RePEc Archive, 2006, 1005
|
||
|
|
|
||
|
|
TODO line 397
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, dimensions=2):
|
||
|
|
Benchmark.__init__(self, dimensions)
|
||
|
|
|
||
|
|
self._bounds = list(zip([-10.0] * self.N, [10.0] * self.N))
|
||
|
|
|
||
|
|
self.global_optimum = [[2.88631, 1.82326]]
|
||
|
|
self.fglob = -2.28395
|
||
|
|
|
||
|
|
def fun(self, x, *args):
|
||
|
|
self.nfev += 1
|
||
|
|
|
||
|
|
a = 0.1 * ((x[0] - 1) ** 2 + (x[1] - 1) ** 2)
|
||
|
|
u = (cos(x[0]) + cos(x[1])) ** 2
|
||
|
|
v = (sin(x[0]) + sin(x[1])) ** 2
|
||
|
|
return a - log((sin(u) ** 2 - cos(v) ** 2 + x[0]) ** 2)
|
||
|
|
|
||
|
|
|
||
|
|
class Mishra07(Benchmark):
|
||
|
|
|
||
|
|
r"""
|
||
|
|
Mishra 7 objective function.
|
||
|
|
|
||
|
|
This class defines the Mishra 7 [1]_ global optimization problem. This
|
||
|
|
is a multimodal minimization problem defined as follows:
|
||
|
|
|
||
|
|
.. math::
|
||
|
|
|
||
|
|
f_{\text{Mishra07}}(x) = \left [\prod_{i=1}^{n} x_i - n! \right]^2
|
||
|
|
|
||
|
|
|
||
|
|
Here, :math:`n` represents the number of dimensions and
|
||
|
|
:math:`x_i \in [-10, 10]` for :math:`i = 1, ..., n`.
|
||
|
|
|
||
|
|
*Global optimum*: :math:`f(x) = 0` for :math:`x_i = \sqrt{n}`
|
||
|
|
for :math:`i = 1, ..., n`
|
||
|
|
|
||
|
|
.. [1] Jamil, M. & Yang, X.-S. A Literature Survey of Benchmark Functions
|
||
|
|
For Global Optimization Problems Int. Journal of Mathematical Modelling
|
||
|
|
and Numerical Optimisation, 2013, 4, 150-194.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, dimensions=2):
|
||
|
|
Benchmark.__init__(self, dimensions)
|
||
|
|
|
||
|
|
self._bounds = list(zip([-10.0] * self.N, [10.0] * self.N))
|
||
|
|
self.custom_bounds = [(-2, 2), (-2, 2)]
|
||
|
|
self.global_optimum = [[sqrt(self.N)
|
||
|
|
for i in range(self.N)]]
|
||
|
|
self.fglob = 0.0
|
||
|
|
self.change_dimensionality = True
|
||
|
|
|
||
|
|
def fun(self, x, *args):
|
||
|
|
self.nfev += 1
|
||
|
|
|
||
|
|
return (prod(x) - factorial(self.N)) ** 2.0
|
||
|
|
|
||
|
|
|
||
|
|
class Mishra08(Benchmark):
|
||
|
|
|
||
|
|
r"""
|
||
|
|
Mishra 8 objective function.
|
||
|
|
|
||
|
|
This class defines the Mishra 8 [1]_ global optimization problem. This
|
||
|
|
is a multimodal minimization problem defined as follows:
|
||
|
|
|
||
|
|
.. math::
|
||
|
|
|
||
|
|
f_{\text{Mishra08}}(x) = 0.001 \left[\lvert x_1^{10} - 20x_1^9
|
||
|
|
+ 180x_1^8 - 960 x_1^7 + 3360x_1^6 - 8064x_1^5 + 13340x_1^4 - 15360x_1^3
|
||
|
|
+ 11520x_1^2 - 5120x_1 + 2624 \rvert \lvert x_2^4 + 12x_2^3 + 54x_2^2
|
||
|
|
+ 108x_2 + 81 \rvert \right]^2
|
||
|
|
|
||
|
|
|
||
|
|
with :math:`x_i \in [-10, 10]` for :math:`i = 1, 2`.
|
||
|
|
|
||
|
|
*Global optimum*: :math:`f(x) = 0` for :math:`x = [2, -3]`
|
||
|
|
|
||
|
|
.. [1] Mishra, S. Global Optimization by Differential Evolution and
|
||
|
|
Particle Swarm Methods: Evaluation on Some Benchmark Functions.
|
||
|
|
Munich Personal RePEc Archive, 2006, 1005
|
||
|
|
|
||
|
|
TODO Line 1065
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, dimensions=2):
|
||
|
|
Benchmark.__init__(self, dimensions)
|
||
|
|
|
||
|
|
self._bounds = list(zip([-10.0] * self.N, [10.0] * self.N))
|
||
|
|
self.custom_bounds = [(1.0, 2.0), (-4.0, 1.0)]
|
||
|
|
self.global_optimum = [[2.0, -3.0]]
|
||
|
|
self.fglob = 0.0
|
||
|
|
|
||
|
|
def fun(self, x, *args):
|
||
|
|
self.nfev += 1
|
||
|
|
|
||
|
|
val = abs(x[0] ** 10 - 20 * x[0] ** 9 + 180 * x[0] ** 8
|
||
|
|
- 960 * x[0] ** 7 + 3360 * x[0] ** 6 - 8064 * x[0] ** 5
|
||
|
|
+ 13340 * x[0] ** 4 - 15360 * x[0] ** 3 + 11520 * x[0] ** 2
|
||
|
|
- 5120 * x[0] + 2624)
|
||
|
|
val += abs(x[1] ** 4 + 12 * x[1] ** 3 +
|
||
|
|
54 * x[1] ** 2 + 108 * x[1] + 81)
|
||
|
|
return 0.001 * val ** 2
|
||
|
|
|
||
|
|
|
||
|
|
class Mishra09(Benchmark):
|
||
|
|
|
||
|
|
r"""
|
||
|
|
Mishra 9 objective function.
|
||
|
|
|
||
|
|
This class defines the Mishra 9 [1]_ global optimization problem. This
|
||
|
|
is a multimodal minimization problem defined as follows:
|
||
|
|
|
||
|
|
.. math::
|
||
|
|
|
||
|
|
f_{\text{Mishra09}}({x}) = \left[ ab^2c + abc^2 + b^2
|
||
|
|
+ (x_1 + x_2 - x_3)^2 \right]^2
|
||
|
|
|
||
|
|
|
||
|
|
Where, in this exercise:
|
||
|
|
|
||
|
|
.. math::
|
||
|
|
|
||
|
|
\begin{cases} a = 2x_1^3 + 5x_1x_2 + 4x_3 - 2x_1^2x_3 - 18 \\
|
||
|
|
b = x_1 + x_2^3 + x_1x_2^2 + x_1x_3^2 - 22 \\
|
||
|
|
c = 8x_1^2 + 2x_2x_3 + 2x_2^2 + 3x_2^3 - 52 \end{cases}
|
||
|
|
|
||
|
|
|
||
|
|
with :math:`x_i \in [-10, 10]` for :math:`i = 1, 2, 3`.
|
||
|
|
|
||
|
|
*Global optimum*: :math:`f(x) = 0` for :math:`x = [1, 2, 3]`
|
||
|
|
|
||
|
|
.. [1] Mishra, S. Global Optimization by Differential Evolution and
|
||
|
|
Particle Swarm Methods: Evaluation on Some Benchmark Functions.
|
||
|
|
Munich Personal RePEc Archive, 2006, 1005
|
||
|
|
|
||
|
|
TODO Line 1103
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, dimensions=3):
|
||
|
|
Benchmark.__init__(self, dimensions)
|
||
|
|
|
||
|
|
self._bounds = list(zip([-10.0] * self.N, [10.0] * self.N))
|
||
|
|
self.global_optimum = [[1.0, 2.0, 3.0]]
|
||
|
|
self.fglob = 0.0
|
||
|
|
|
||
|
|
def fun(self, x, *args):
|
||
|
|
self.nfev += 1
|
||
|
|
|
||
|
|
a = (2 * x[0] ** 3 + 5 * x[0] * x[1]
|
||
|
|
+ 4 * x[2] - 2 * x[0] ** 2 * x[2] - 18)
|
||
|
|
b = x[0] + x[1] ** 3 + x[0] * x[1] ** 2 + x[0] * x[2] ** 2 - 22.0
|
||
|
|
c = (8 * x[0] ** 2 + 2 * x[1] * x[2]
|
||
|
|
+ 2 * x[1] ** 2 + 3 * x[1] ** 3 - 52)
|
||
|
|
|
||
|
|
return (a * c * b ** 2 + a * b * c ** 2 + b ** 2
|
||
|
|
+ (x[0] + x[1] - x[2]) ** 2) ** 2
|
||
|
|
|
||
|
|
|
||
|
|
class Mishra10(Benchmark):
|
||
|
|
|
||
|
|
r"""
|
||
|
|
Mishra 10 objective function.
|
||
|
|
|
||
|
|
This class defines the Mishra 10 global optimization problem. This is a
|
||
|
|
multimodal minimization problem defined as follows:
|
||
|
|
|
||
|
|
.. math::
|
||
|
|
TODO - int(x) should be used instead of floor(x)!!!!!
|
||
|
|
f_{\text{Mishra10}}({x}) = \left[ \lfloor x_1 \perp x_2 \rfloor -
|
||
|
|
\lfloor x_1 \rfloor - \lfloor x_2 \rfloor \right]^2
|
||
|
|
|
||
|
|
with :math:`x_i \in [-10, 10]` for :math:`i =1, 2`.
|
||
|
|
|
||
|
|
*Global optimum*: :math:`f(x) = 0` for :math:`x = [2, 2]`
|
||
|
|
|
||
|
|
.. [1] Mishra, S. Global Optimization by Differential Evolution and
|
||
|
|
Particle Swarm Methods: Evaluation on Some Benchmark Functions.
|
||
|
|
Munich Personal RePEc Archive, 2006, 1005
|
||
|
|
|
||
|
|
TODO line 1115
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, dimensions=2):
|
||
|
|
Benchmark.__init__(self, dimensions)
|
||
|
|
|
||
|
|
self._bounds = list(zip([-10.0] * self.N, [10.0] * self.N))
|
||
|
|
self.global_optimum = [[2.0, 2.0]]
|
||
|
|
self.fglob = 0.0
|
||
|
|
|
||
|
|
def fun(self, x, *args):
|
||
|
|
self.nfev += 1
|
||
|
|
|
||
|
|
x1, x2 = int(x[0]), int(x[1])
|
||
|
|
f1 = x1 + x2
|
||
|
|
f2 = x1 * x2
|
||
|
|
return (f1 - f2) ** 2.0
|
||
|
|
|
||
|
|
|
||
|
|
class Mishra11(Benchmark):
|
||
|
|
|
||
|
|
r"""
|
||
|
|
Mishra 11 objective function.
|
||
|
|
|
||
|
|
This class defines the Mishra 11 [1]_ global optimization problem. This is a
|
||
|
|
multimodal minimization problem defined as follows:
|
||
|
|
|
||
|
|
.. math::
|
||
|
|
|
||
|
|
f_{\text{Mishra11}}(x) = \left [ \frac{1}{n} \sum_{i=1}^{n} \lvert x_i
|
||
|
|
\rvert - \left(\prod_{i=1}^{n} \lvert x_i \rvert \right )^{\frac{1}{n}}
|
||
|
|
\right]^2
|
||
|
|
|
||
|
|
|
||
|
|
Here, :math:`n` represents the number of dimensions and
|
||
|
|
:math:`x_i \in [-10, 10]` for :math:`i = 1, ..., n`.
|
||
|
|
|
||
|
|
*Global optimum*: :math:`f(x) = 0` for :math:`x_i = 0` for
|
||
|
|
:math:`i = 1, ..., n`
|
||
|
|
|
||
|
|
.. [1] Jamil, M. & Yang, X.-S. A Literature Survey of Benchmark Functions
|
||
|
|
For Global Optimization Problems Int. Journal of Mathematical Modelling
|
||
|
|
and Numerical Optimisation, 2013, 4, 150-194.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, dimensions=2):
|
||
|
|
Benchmark.__init__(self, dimensions)
|
||
|
|
|
||
|
|
self._bounds = list(zip([-10.0] * self.N, [10.0] * self.N))
|
||
|
|
self.custom_bounds = [(-3, 3), (-3, 3)]
|
||
|
|
|
||
|
|
self.global_optimum = [[0.0 for _ in range(self.N)]]
|
||
|
|
self.fglob = 0.0
|
||
|
|
self.change_dimensionality = True
|
||
|
|
|
||
|
|
def fun(self, x, *args):
|
||
|
|
self.nfev += 1
|
||
|
|
|
||
|
|
N = self.N
|
||
|
|
return ((1.0 / N) * sum(abs(x)) - (prod(abs(x))) ** 1.0 / N) ** 2.0
|
||
|
|
|
||
|
|
|
||
|
|
class MultiModal(Benchmark):
|
||
|
|
|
||
|
|
r"""
|
||
|
|
MultiModal objective function.
|
||
|
|
|
||
|
|
This class defines the MultiModal global optimization problem. This
|
||
|
|
is a multimodal minimization problem defined as follows:
|
||
|
|
|
||
|
|
.. math::
|
||
|
|
|
||
|
|
f_{\text{MultiModal}}(x) = \left( \sum_{i=1}^n \lvert x_i \rvert
|
||
|
|
\right) \left( \prod_{i=1}^n \lvert x_i \rvert \right)
|
||
|
|
|
||
|
|
|
||
|
|
Here, :math:`n` represents the number of dimensions and
|
||
|
|
:math:`x_i \in [-10, 10]` for :math:`i = 1, ..., n`.
|
||
|
|
|
||
|
|
*Global optimum*: :math:`f(x) = 0` for :math:`x_i = 0` for
|
||
|
|
:math:`i = 1, ..., n`
|
||
|
|
|
||
|
|
.. [1] Gavana, A. Global Optimization Benchmarks and AMPGO retrieved 2015
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, dimensions=2):
|
||
|
|
Benchmark.__init__(self, dimensions)
|
||
|
|
|
||
|
|
self._bounds = list(zip([-10.0] * self.N, [10.0] * self.N))
|
||
|
|
self.custom_bounds = [(-5, 5), (-5, 5)]
|
||
|
|
|
||
|
|
self.global_optimum = [[0.0 for _ in range(self.N)]]
|
||
|
|
self.fglob = 0.0
|
||
|
|
self.change_dimensionality = True
|
||
|
|
|
||
|
|
def fun(self, x, *args):
|
||
|
|
self.nfev += 1
|
||
|
|
|
||
|
|
return sum(abs(x)) * prod(abs(x))
|