text: from jmetal.algorithm.multiobjective.spea2 import SPEA2
  from jmetal.operator import SBXCrossover, PolynomialMutation
  from jmetal.problem import ZDT1
  from jmetal.util.comparator import GDominanceComparator
  from jmetal.util.solution import print_function_values_to_file, print_variables_to_file, read_solutions
  from jmetal.util.termination_criterion import StoppingByEvaluations
  
  if __name__ == '__main__':
      problem = ZDT1()
      problem.reference_front = read_solutions(filename='resources/reference_front/ZDT1.pf')
  
      reference_point = [0.4, 0.6]
  
      max_evaluations = 25000
      algorithm = SPEA2(
          problem=problem,
          population_size=40,
          offspring_population_size=40,
          mutation=PolynomialMutation(probability=1.0 / problem.number_of_variables, distribution_index=20),
          crossover=SBXCrossover(probability=1.0, distribution_index=20),
          termination_criterion=StoppingByEvaluations(max_evaluations=max_evaluations),
          dominance_comparator=GDominanceComparator(reference_point)
      )
  
      algorithm.run()
      front = algorithm.get_result()
  
      # Save results to file
      print_function_values_to_file(front, 'FUN.' + algorithm.label)
      print_variables_to_file(front, 'VAR.'+ algorithm.label)
  
      print(f'Algorithm: ${algorithm.get_name()}')
      print(f'Problem: ${problem.get_name()}')
      print(f'Computing time: ${algorithm.total_computing_time}')
  