@staticmethod
def latex_code():
    'Return the latex code of the problem.\n\n\t\tReturns:\n\t\t\tstr: Latex code\n\t\t'
    return '$f(\\textbf{x}) = - 0.1 \\sum_{i = 1}^D \\cos (5 \\pi x_i) - \\sum_{i = 1}^D x_i^2$'
Return the latex code of the problem.

Returns:
        str: Latex code
@staticmethod
def latex_code():
    'Return the latex code of the problem.\n\n\t\tReturns:\n\t\t\tstr: Latex code\n\t\t'
    return '$f(\\textbf{x}) = - 0.1 \\sum_{i = 1}^D \\cos (5 \\pi x_i) - \\sum_{i = 1}^D x_i^2$'