def mutate(self, mother):
child = Program.Program('Mutant', self.config)
child.assignments['preloop'] = []
for assignment in mother.assignments['preloop']:
new_assignment = Program.Assignment(
self.config, assignment.variable, False,
np.random.normal(
assignment.lhs,
self.config.CONST_MATING_DRIFT * abs(assignment.lhs)))
child.assignments['preloop'].append(new_assignment)
if ('const' in assignment.variable):
child.consts['loop'].append(assignment.variable)
child.consts['global'].append(assignment.variable)
tree_mother = copy.deepcopy(mother.loop_tree)
crossover_mother = rec_select_random_tree_node(tree_mother)
crossover_direction = random.choice(['LEFT', 'RIGHT'])
if (crossover_direction == 'LEFT'):
crossover_mother.left_child = rec_create_random_tree(
self.config, child.consts['loop'])
else:
crossover_mother.right_child = rec_create_random_tree(
self.config, child.consts['loop'])
child.loop_tree = tree_mother
child.rec_reduce()
return child
def create_random_program(config):
program = Program.Program('Alien', config)
n_consts = abs(
int(np.random.normal(config.N_CONSTS_EV, config.N_CONSTS_SD)))
for i in range(n_consts):
value = create_random_const(config)
const = 'const_' + str(random.getrandbits(100))
program.consts['loop'].append(const)
program.consts['global'].append(const)
assignment = Program.Assignment(config, const, False, value)
program.assignments['preloop'].append(assignment)
program.loop_tree = rec_create_random_tree(config, program.consts['loop'])
program.rec_reduce()
return program
