class_docstr: Deb 1 objective function.
  
  This class defines the Deb 1 [1]_ global optimization problem. This is a
  multimodal minimization problem defined as follows:
  
  .. math::
  
      f_{\text{Deb01}}(x) = - \frac{1}{N} \sum_{i=1}^n \sin^6(5 \pi x_i)
  
  
  Here, :math:`n` represents the number of dimensions and
  :math:`x_i \in [-1, 1]` for :math:`i = 1, ..., n`.
  
  *Global optimum*: :math:`f(x_i) = 0.0`. The number of global minima is
  :math:`5^n` that are evenly spaced in the function landscape, where
  :math:`n` represents the dimension of the problem.
  
  .. [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.
code: def fun(self, x, *args):
      self.nfev += 1
      return -(1.0 / self.N) * sum(sin(5 * pi * x) ** 6.0)
  
imports: import numpy
  from numpy import abs, cos, exp, arange, pi, sin, sqrt, sum, zeros, tanh
  from numpy.testing import assert_almost_equal
  from .go_benchmark import Benchmark
label_desc: Use image node_id 2 for calling the Deb01 obj's underlying member method code with example usage: obj.fun(x) and returns: unknown