code: def objective(x):
      return (
          3 * x[0]
          + 1.0e-6 * x[0] ** 3
          + 2 * x[1]
          + 2.0e-6 / 3 * x[1] ** 3
          + x[2] ** 2
      )
  
imports: import mystic
  import mystic.symbolic
  import scipy.optimize
label_desc: Use image node_id 1 for calling a global function with example usage: objective(x) and returns: unknown