def fun(self, x, *args):
        self.nfev += 1

        beta, m = 15.0, 5.0
        u = sum((beta / x) ** (2 * m))
        v = sum(x ** 2)
        w = prod(cos(x) ** 2)

        return exp(-u) - 2 * exp(-v) * w
dataset/ETHPy150Open scipy/scipy/benchmarks/benchmarks/go_benchmark_functions/go_funcs_X.py/XinSheYang03.fun/swapped operands of `/`