code: def hartmann6_4_mf(z, x):
      """Hartmann function in 3D."""
      f0 = z[0][0] / (9467.18 - 1234.9)
      f1 = z[0][1] / (9467.18 - 1234.9)
      f2 = (
          len(z[1])
          + 1.5 * float("a" in z[1])
          + 0.5 * float("i" in z[1])
      ) / 4.5
      f3 = z[2][0] / float(234 - 123)
      f = np.array([f0, f1, f2, f3])
      delta = np.array([0.1] * 4)
      alpha = np.array([1.0, 1.2, 3.0, 3.2])
      alpha_z = alpha - delta * (1 - f)
      return hartmann6_4_alpha(x, alpha_z)
  
imports: import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: hartmann6_4_mf(z, x) and returns: hartmann6_4_alpha