code: def c_1(x):
      return x[0] + x[1] < 0
  
imports: import numpy
  from opytimark.markers.n_dimensional import Sphere
  from opytimizer import Opytimizer
  from opytimizer.functions import ConstrainedFunction
  from opytimizer.optimizers.swarm import PSO
  from opytimizer.spaces import SearchSpace
label_desc: Use image node_id 1 for calling a global function with example usage: c_1(x) and returns: unknown