def test_should_the_solution_remain_unchanged_if_the_probability_is_zero(
self):
operator = BitFlip(0.0)
solution = BinarySolution(number_of_variables=1,
number_of_objectives=1)
solution.variables[0] = [True, True, False, False, True, False]
mutated_solution = operator.execute(solution)
self.assertEqual([True, True, False, False, True, False],
mutated_solution.variables[0])
def test_should_the_solution_change_all_the_bits_if_the_probability_is_one(
self):
operator = BitFlip(1.0)
solution = BinarySolution(number_of_variables=2,
number_of_objectives=1)
solution.variables[0] = [True, True, False, False, True, False]
solution.variables[1] = [False, True, True, False, False, True]
mutated_solution = operator.execute(solution)
self.assertEqual([False, False, True, True, False, True],
mutated_solution.variables[0])
self.assertEqual([True, False, False, True, True, False],
mutated_solution.variables[1])
def binary_example() -> None:
bits = 256
problem = OneMax(bits)
algorithm = ElitistEvolutionStrategy[BinarySolution, BinarySolution]\
(problem, mu=1, lambdA=10, max_evaluations= 5000, mutation_operator=BitFlip(1.0/bits))
algorithm.run()
result = algorithm.get_result()
print("Algorithm: " + algorithm.get_name())
print("Problem: " + problem.get_name())
print("Solution: " + str(result.variables[0]))
print("Fitness: " + str(result.objectives[0]))
def test_should_constructor_raise_an_exception_if_the_probability_is_lower_than_zero(
self):
with self.assertRaises(Exception):
BitFlip(-12)
def test_should_constructor_raise_an_exception_if_the_probability_is_greater_than_one(
self):
with self.assertRaises(Exception):
BitFlip(2)
def test_should_constructor_create_a_valid_operator(self):
operator = BitFlip(0.5)
self.assertEqual(0.5, operator.probability)
def test_should_constructor_create_a_non_null_object(self):
solution = BitFlip(1.0)
self.assertIsNotNone(solution)