code: def currin_exp(x, alpha):
      """Computes the currin exponential function."""
      x1 = x[0]
      x2 = x[1]
      val_1 = 1 - alpha * np.exp(-1 / (2 * x2))
      val_2 = (2300 * x1**3 + 1900 * x1**2 + 2092 * x1 + 60) / (
          100 * x1**3 + 500 * x1**2 + 4 * x1 + 20
      )
      return val_1 * val_2
  
imports: from __future__ import division
  import numpy
  from .general_utils import map_to_cube
  from ..exd.experiment_caller import EuclideanFunctionCaller
label_desc: Use image node_id 4 for calling a global function with example usage: currin_exp(x, alpha) and returns: unknown