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CEC2017 优化问题的测试函数
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CEC 2017 常用的单目标测试函数,可用于测试智能优化方法的性能。(Problem Definitions and Evaluation Criteria for the CEC 2017 Competition on Constrained RealParameter Optimization)
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ProblemDefinitionsandEvaluationCriteria
fortheCEC2017CompetitionandSpecial
SessiononConstrainedSingleObje....
TechnicalReport·October2016
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Problem Definitions and Evaluation Criteria for
the CEC 2017 Competition on Constrained Real-
Parameter Optimization
Guohua Wu, R. Mallipeddi, P. N. Suganthan
guohuawu@nudt.edu.cn, mallipeddi.ram@gmail.com, epnsugan@ntu.edu.sg
National University of Defense Technology, Changsha, Hunan, P.R. China
Kyungpook National University, Daegu, South Korea
Nanyang Technological University, Singapore
Technical Report
September, 2017
Introduction
In real-world applications, most optimization problems contain constraints (ranging from
physical, time, geometric, design etc.) which need to be satisfied while finding an optimal
solution. However, the presence of constraints alters the shape of the search space making it
difficult to solve. In the last few decades, stochastic search algorithms such as evolutionary
algorithms have gained popularity due to their effectiveness in solving optimization problems.
However, since evolutionary algorithms or most meta-heuristics naturally designed for
unconstrained optimization problems require additional mechanisms to solve constrained
optimization problems.
Initially, the effectiveness of different penalty functions (both in evolutionary algorithms and
in mathematical programming) has been investigated for several decades. However, the
penalty functions have, in general, several limitations.For instance, they are not suitable for
optimization problems where the optimum is on the boundary connecting the feasible and the
infeasible regions or when the feasible region is disjoint.In addition, penalty functions require
intensive fine-tuning to identify the most appropriate penaltyfactors to be employed. In the
last few decades, a variety approaches have been proposed in conjunction with evolutionary
algorithms to handle constraints. Most popular among them are self-adaptive penalty, epsilon
constraint handling, superiority of feasible and stochastic ranking. Recently, the idea of
ensemble of different constraint handling methods was proposed where each constraint
handling method is apt only for a group of problems [1].
For competition in CEC06 [2], 24 benchmark functions with dimensionality varying from 2-
20 have been developed. However, the CEC06 benchmark problems are not scalable. In the
modern era of Big Data, most optimization problems that are being considered contain few
hundreds of variables with a wide variety of constraints. Therefore, it necessary to test the
scalability of the optimization algorithms that are being developed on a set of scalable
constrained optimization problems. In [3], a test-case generator for constrained parameter
optimization problems was proposed. In [4], 18 benchmark functions which are scalable (10-
and 30-dimensional) were developed for the competition in CEC2010. However, the
optimization problems proposed for competitions in CEC06 and CEC2010 have been
successfully solved. In this report, we develop a set of 28 benchmark constrained
optimization problems with dimensions 10, 30, 50 and 100. The developed problems contain
a wide variety of constraints.
The mathematical formulas and properties of these functions are described in Section 1. In
Section 2, the evaluationcriteria are given. A suggested format to present the results is also
given in Section 3.
1. Definitions of the Function Suite
In this section, 28 constrained optimization problems are proposedwhich can be transformed
into the following format:
Minimize:
12
( ), ( , ,..., )
n
fX X xx x=
and
XS∈
(1)
Subject to:
( ) 0, 1,...,
( ) 0, 1,...,
i
j
gX i p
hX j p m
≤=
= = +
(2)
Usually equality constraints are transformed into inequalities of the form
() 0
j
hX
ε
−≤
, for
1,...,jp m= +
… (3)
A solution X is regarded as feasible if
() ≤0 , for = 1, … , and
() 0
j
hX
ε
−≤
, for
1,...,jp m= +
. In this special session
ε
is set to 0.0001.
C01:
2
11
Min ( )
Di
j
ij
fx z z x o
= =
= = −
∑∑
2
1
( ) 5000cos(0.1 ) 4000 0
D
ii
i
gx z z
π
=
=− −≤
∑
[ 100,100]
D
x∈−
C02:
2
11
Min ( ) , *
Di
j
ij
fx z z x oy M z
= =
= =−=
∑∑
2
1
( ) 5000cos(0.1 ) 4000 0
D
ii
i
gx y y
π
=
= − −≤
∑
[ 100,100]
D
x∈−
C03:
2
11
Min ( )
Di
j
ij
fx z z x o
= =
= = −
∑∑
2
1
( ) 5000cos(0.1 ) 4000 0
D
ii
i
gx z z
π
=
=− −≤
∑
1
( ) sin(0.1 ) 0
D
ii
i
hx z z
π
=
=−=
∑
[ 100,100]
D
x∈−
C04:
2
1
Min ( ) 10cos(2 ) 10
D
ii
i
fx z z z x o
π
=
=− +=−
∑
1
1
( ) sin(2 ) 0
D
ii
i
gx z z
=
=−≤
∑
2
1
( ) sin( ) 0
D
ii
i
gx z z
=
= ≤
∑
D
[ 10, 10]x
∈−
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