code: def borehole_6_z(x, z):
      """Computes the Bore Hole function."""
      # pylint: disable=bad-whitespace
      rw = x[0][0]
      L = x[1][0] * (1680 - 1120.0) + 1120
      Kw = x[1][1] * (12045 - 9855) + 9855
      Tu = x[2]
      Tl = x[3]
      Hu = x[4][0] / 2.0 + 990.0
      Hl = x[4][1] / 2.0 + 700.0
      r = x[5]
      # Compute high fidelity function
      frac2 = (
          2
          * L
          * Tu
          / (np.log(r / rw) * rw**2 * Kw + 0.001)
          * np.exp(z[1] - 1)
      )
      f2 = (
          2
          * np.pi
          * Tu
          * (Hu - Hl)
          / (np.log(r / rw) * (1 + frac2 + Tu / Tl))
      )
      f1 = (
          5
          * Tu
          * (Hu - Hl)
          / (np.log(r / rw) * (1.5 + frac2 + Tu / Tl))
      )
      return f2 * z[0] + (1 - z[0]) * f1
  
imports: import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: borehole_6_z(x, z) and returns: unknown