code: def objective(x, sign=1):
      x = np.asarray(x)
      return sign * (
          2 * x[0] * x[1] + 2 * x[0] - x[0] ** 2 - 2 * x[1] ** 2
      )
  
imports: import numpy
  import mystic.symbolic
  import mystic.solvers
  import mystic.math
label_desc: Use image node_id 1 for calling a global function with example usage: objective(x, sign) and returns: unknown