Source code for niapy.problems.quintic
# encoding=utf8
"""Implementation of Quintic funcion."""
import numpy as np
from niapy.problems.problem import Problem
__all__ = ['Quintic']
[docs]class Quintic(Problem):
r"""Implementation of Quintic function.
Date: 2018
Author: Lucija Brezočnik
License: MIT
Function: **Quintic function**
:math:`f(\mathbf{x}) = \sum_{i=1}^D \left| x_i^5 - 3x_i^4 +
4x_i^3 + 2x_i^2 - 10x_i - 4\right|`
**Input domain:**
The function can be defined on any input domain but it is usually
evaluated on the hypercube :math:`x_i ∈ [-10, 10]`, for all :math:`i = 1, 2,..., D`.
**Global minimum:** :math:`f(x^*) = 0`, at :math:`x^* = f(-1\; \text{or}\; 2)`
LaTeX formats:
Inline:
$f(\mathbf{x}) = \sum_{i=1}^D \left| x_i^5 - 3x_i^4 +
4x_i^3 + 2x_i^2 - 10x_i - 4\right|$
Equation:
\begin{equation} f(\mathbf{x}) =
\sum_{i=1}^D \left| x_i^5 - 3x_i^4 + 4x_i^3 + 2x_i^2 -
10x_i - 4\right| \end{equation}
Domain:
$-10 \leq x_i \leq 10$
Reference paper:
Jamil, M., and Yang, X. S. (2013).
A literature survey of benchmark functions for global optimisation problems.
International Journal of Mathematical Modelling and Numerical Optimisation,
4(2), 150-194.
"""
[docs] def __init__(self, dimension=4, lower=-10.0, upper=10.0, *args, **kwargs):
r"""Initialize Quintic problem..
Args:
dimension (Optional[int]): Dimension of the problem.
lower (Optional[Union[float, Iterable[float]]]): Lower bounds of the problem.
upper (Optional[Union[float, Iterable[float]]]): Upper bounds of the problem.
See Also:
:func:`niapy.problems.Problem.__init__`
"""
super().__init__(dimension, lower, upper, *args, **kwargs)
[docs] @staticmethod
def latex_code():
r"""Return the latex code of the problem.
Returns:
str: Latex code.
"""
return r'''$f(\mathbf{x}) = \sum_{i=1}^D \left| x_i^5 - 3x_i^4 +
4x_i^3 + 2x_i^2 - 10x_i - 4\right|$'''
def _evaluate(self, x):
return np.sum(np.abs(x ** 5 - 3.0 * x ** 4 + 4.0 * x ** 3 + 2.0 * x ** 2 - 10.0 * x - 4.0))