docs: def build_sample_ace_problem_breiman2(N=500):
      """Build sample problem y(x) = exp(sin(x))."""
      x = numpy.linspace(0, 1, N)
      # x = numpy.random.uniform(0, 1, size=N)
      noise = numpy.random.standard_normal(N)
      y = numpy.exp(numpy.sin(2 * numpy.pi * x)) + 0.0 * noise
      return [x], y