def _start_experiments(self):
self.cc.settings['general']['distribution'][
'start_time'] = time.strftime('%Y-%m-%d_%H-%M-%S')
# If DB logging is enabled, create a new experiment and attach its ID to settings for clients
db_logger = DbLogger()
if db_logger.is_enabled:
self.experiment_id = db_logger.create_experiment(self.cc.settings)
self.cc.settings['general']['logging'][
'experiment_id'] = self.experiment_id
for client in self.cc.settings['general']['distribution'][
'client_nodes']:
address = 'http://{}:{}/experiments'.format(
client['address'], client['port'])
try:
resp = requests.post(address, json=self.cc.settings)
assert resp.status_code == 200, resp.text
self._logger.info(
'Successfully started experiment on {}'.format(address))
except AssertionError as err:
self._logger.critical(
'Could not start experiment on {}: {}'.format(
address, err))
self._terminate()
def __init__(self,
dataloader,
network_factory,
population_size=10,
tournament_size=2,
mutation_probability=0.9,
n_replacements=1,
sigma=0.25,
alpha=0.25,
default_adam_learning_rate=0.001,
calc_mixture=False,
mixture_sigma=0.01,
score_sample_size=10000,
discriminator_skip_each_nth_step=0,
enable_selection=True):
super().__init__(dataloader, network_factory, population_size,
tournament_size, mutation_probability, n_replacements,
sigma, alpha)
self.batch_number = 0
self._default_adam_learning_rate = self.settings.get(
'default_adam_learning_rate', default_adam_learning_rate)
self._discriminator_skip_each_nth_step = self.settings.get(
'discriminator_skip_each_nth_step',
discriminator_skip_each_nth_step)
self._enable_selection = self.settings.get('enable_selection',
enable_selection)
self.mixture_sigma = self.settings.get('mixture_sigma', mixture_sigma)
self.neighbourhood = Neighbourhood.instance()
for i, individual in enumerate(self.population_gen.individuals):
individual.learning_rate = self._default_adam_learning_rate
individual.id = '{}/G{}'.format(self.neighbourhood.cell_number, i)
for i, individual in enumerate(self.population_dis.individuals):
individual.learning_rate = self._default_adam_learning_rate
individual.id = '{}/D{}'.format(self.neighbourhood.cell_number, i)
self.concurrent_populations = ConcurrentPopulations.instance()
self.concurrent_populations.generator = self.population_gen
self.concurrent_populations.discriminator = self.population_dis
self.concurrent_populations.unlock()
experiment_id = ConfigurationContainer.instance(
).settings['general']['logging'].get('experiment_id', None)
self.db_logger = DbLogger(current_experiment=experiment_id)
if 'score' in self.settings and self.settings['score'].get(
'enabled', calc_mixture):
self.score_calc = ScoreCalculatorFactory.create()
self.score_sample_size = self.settings['score'].get(
'sample_size', score_sample_size)
self.score = float(
'inf') if self.score_calc.is_reversed else float('-inf')
else:
self.score_calc = None
self.score = 0
def _terminate(self, stop_clients=True, return_code=-1):
try:
if stop_clients:
self._logger.info('Stopping clients...')
self.comms.close_all() #stop_running_experiments()
finally:
db_logger = DbLogger()
if db_logger.is_enabled and self.experiment_id is not None:
db_logger.finish_experiment(self.experiment_id)
exit(return_code)
def _terminate(self, stop_clients=True, return_code=-1):
try:
if self.heartbeat_thread:
self._logger.info('Stopping heartbeat...')
self.heartbeat_thread.stopped.set()
self.heartbeat_thread.join()
if stop_clients:
self._logger.info('Stopping clients...')
node_client = NodeClient(None)
node_client.stop_running_experiments()
finally:
db_logger = DbLogger()
if db_logger.is_enabled and self.experiment_id is not None:
db_logger.finish_experiment(self.experiment_id)
exit(return_code)
def _start_experiments(self):
self.cc.settings['general']['distribution'][
'start_time'] = time.strftime('%Y-%m-%d_%H-%M-%S')
# If DB logging is enabled, create a new experiment and attach its ID to settings for clients
db_logger = DbLogger()
if db_logger.is_enabled:
self.experiment_id = db_logger.create_experiment(self.cc.settings)
self.cc.settings['general']['logging'][
'experiment_id'] = self.experiment_id
while self.grid.empty_spaces() > 0:
worker = self.topology.get_best_worker()
w_id = self.grid.assign_worker(worker)
self.topology.assign_worker(worker)
self._logger.info("Asigned worker {} to wid {}".format(
worker, w_id))
self.comms.send_task("new_comm",
worker,
data={
"color": 0,
"key": w_id
})
for off_pu in self.topology.inactive_pu:
self._logger.info("Asigned worker {} to rest".format(off_pu))
self.comms.send_task("new_comm",
off_pu,
data={
"color": 1,
"key": off_pu
})
self.comms.new_comm(1, 0)
# print(self.grid.grid)
for proc_unit in self.grid.grid_to_list():
self.cc.settings["general"]["distribution"]["grid"][
"config"] = self.grid.grid
self.comms.start_worker(proc_unit, self.cc.settings)
def _gather_results(self):
self._logger.info('Collecting results from clients...')
# Initialize node client
dataloader = self.cc.create_instance(
self.cc.settings['dataloader']['dataset_name'])
network_factory = self.cc.create_instance(
self.cc.settings['network']['name'], dataloader.n_input_neurons)
node_client = NodeClient(network_factory)
db_logger = DbLogger()
results = node_client.gather_results(
self.cc.settings['general']['distribution']['client_nodes'], 120)
scores = []
for (node, generator_pop, discriminator_pop, weights_generator,
weights_discriminator) in results:
node_name = '{}:{}'.format(node['address'], node['port'])
try:
output_dir = self.get_and_create_output_dir(node)
for generator in generator_pop.individuals:
source = generator.source.replace(':', '-')
filename = '{}{}.pkl'.format(GENERATOR_PREFIX, source)
torch.save(
generator.genome.net.state_dict(),
os.path.join(output_dir,
'generator-{}.pkl'.format(source)))
with open(os.path.join(output_dir, 'mixture.yml'),
"a") as file:
file.write('{}: {}\n'.format(
filename, weights_generator[generator.source]))
for discriminator in discriminator_pop.individuals:
source = discriminator.source.replace(':', '-')
filename = '{}{}.pkl'.format(DISCRIMINATOR_PREFIX, source)
torch.save(discriminator.genome.net.state_dict(),
os.path.join(output_dir, filename))
# Save images
dataset = MixedGeneratorDataset(
generator_pop, weights_generator,
self.cc.settings['master']['score_sample_size'],
self.cc.settings['trainer']
['mixture_generator_samples_mode'])
image_paths = self.save_samples(dataset, output_dir,
dataloader)
self._logger.info(
'Saved mixture result images of client {} to target directory {}.'
.format(node_name, output_dir))
# Calculate inception or FID score
score = float('-inf')
if self.cc.settings['master']['calculate_score']:
calc = ScoreCalculatorFactory.create()
self._logger.info('Score calculator: {}'.format(
type(calc).__name__))
self._logger.info(
'Calculating score score of {}. Depending on the type, this may take very long.'
.format(node_name))
score = calc.calculate(dataset)
self._logger.info(
'Node {} with weights {} yielded a score of {}'.format(
node_name, weights_generator, score))
scores.append((node, score))
if db_logger.is_enabled and self.experiment_id is not None:
db_logger.add_experiment_results(self.experiment_id,
node_name, image_paths,
score)
except Exception as ex:
self._logger.error(
'An error occured while trying to gather results from {}: {}'
.format(node_name, ex))
traceback.print_exc()
if self.cc.settings['master']['calculate_score'] and scores:
best_node = sorted(
scores,
key=lambda x: x[1],
reverse=ScoreCalculatorFactory.create().is_reversed)[-1]
self._logger.info('Best result: {}:{} = {}'.format(
best_node[0]['address'], best_node[0]['port'], best_node[1]))
def __init__(
self,
dataloader,
network_factory,
population_size=10,
tournament_size=2,
mutation_probability=0.9,
n_replacements=1,
sigma=0.25,
alpha=0.25,
default_adam_learning_rate=0.001,
calc_mixture=False,
mixture_sigma=0.01,
score_sample_size=10000,
discriminator_skip_each_nth_step=0,
enable_selection=True,
fitness_sample_size=10000,
calculate_net_weights_dist=False,
fitness_mode="worst",
es_score_sample_size=10000,
es_random_init=False,
checkpoint_period=0,
):
super().__init__(
dataloader,
network_factory,
population_size,
tournament_size,
mutation_probability,
n_replacements,
sigma,
alpha,
)
self.batch_number = 0
self.cc = ConfigurationContainer.instance()
self._default_adam_learning_rate = self.settings.get(
"default_adam_learning_rate", default_adam_learning_rate)
self._discriminator_skip_each_nth_step = self.settings.get(
"discriminator_skip_each_nth_step",
discriminator_skip_each_nth_step,
)
self._enable_selection = self.settings.get("enable_selection",
enable_selection)
self.mixture_sigma = self.settings.get("mixture_sigma", mixture_sigma)
self.neighbourhood = Neighbourhood.instance()
for i, individual in enumerate(self.population_gen.individuals):
individual.learning_rate = self.settings.get(
"default_g_adam_learning_rate",
self._default_adam_learning_rate,
)
individual.id = "{}/G{}".format(self.neighbourhood.cell_number, i)
for i, individual in enumerate(self.population_dis.individuals):
individual.learning_rate = self.settings.get(
"default_d_adam_learning_rate",
self._default_adam_learning_rate,
)
individual.id = "{}/D{}".format(self.neighbourhood.cell_number, i)
self.concurrent_populations = ConcurrentPopulations.instance()
self.concurrent_populations.generator = self.population_gen
self.concurrent_populations.discriminator = self.population_dis
self.concurrent_populations.unlock()
experiment_id = self.cc.settings["general"]["logging"].get(
"experiment_id", None)
self.db_logger = DbLogger(current_experiment=experiment_id)
if "fitness" in self.settings:
self.fitness_sample_size = self.settings["fitness"].get(
"fitness_sample_size", fitness_sample_size)
self.fitness_loaded = self.dataloader.load()
self.fitness_iterator = iter(
self.fitness_loaded) # Create iterator for fitness loader
# Determine how to aggregate fitness calculated among neighbourhood
self.fitness_mode = self.settings["fitness"].get(
"fitness_mode", fitness_mode)
if self.fitness_mode not in ["worse", "best", "average"]:
raise NotImplementedError(
"Invalid argument for fitness_mode: {}".format(
self.fitness_mode))
else:
# TODO: Add code for safe implementation & error handling
raise KeyError(
"Fitness section must be defined in configuration file")
n_iterations = self.cc.settings["trainer"].get("n_iterations", 0)
if ("score" in self.settings and self.settings["score"].get(
"enabled",
calc_mixture)) or "optimize_mixture" in self.settings:
self.score_calc = ScoreCalculatorFactory.create()
self.score_sample_size = self.settings["score"].get(
"sample_size", score_sample_size)
self.score = float(
"inf") if self.score_calc.is_reversed else float("-inf")
self.mixture_generator_samples_mode = self.cc.settings["trainer"][
"mixture_generator_samples_mode"]
else:
self.score_sample_size = score_sample_size
self.score_calc = None
self.score = 0
if "optimize_mixture" in self.settings:
self.optimize_weights_at_the_end = self.settings[
"optimize_mixture"].get("enabled", True)
self.score_sample_size = self.settings["optimize_mixture"].get(
"sample_size", es_score_sample_size)
self.es_generations = self.settings["optimize_mixture"].get(
"es_generations", n_iterations)
self.es_random_init = self.settings["optimize_mixture"].get(
"es_random_init", es_random_init)
self.mixture_sigma = self.settings["optimize_mixture"].get(
"mixture_sigma", mixture_sigma)
self.mixture_generator_samples_mode = self.cc.settings["trainer"][
"mixture_generator_samples_mode"]
else:
self.optimize_weights_at_the_end = True
self.score_sample_size = es_score_sample_size
self.es_generations = n_iterations
self.es_random_init = es_random_init
self.mixture_sigma = mixture_sigma
self.mixture_generator_samples_mode = self.cc.settings["trainer"][
"mixture_generator_samples_mode"]
assert 0 <= checkpoint_period <= n_iterations, (
"Checkpoint period paramenter (checkpoint_period) should be "
"between 0 and the number of iterations (n_iterations).")
self.checkpoint_period = self.cc.settings["general"].get(
"checkpoint_period", checkpoint_period)
class LipizzanerGANTrainer(EvolutionaryAlgorithmTrainer):
"""
Distributed, asynchronous trainer for coevolutionary GANs. Uses the standard Goodfellow GAN approach.
(Without discriminator mixture)
"""
def __init__(
self,
dataloader,
network_factory,
population_size=10,
tournament_size=2,
mutation_probability=0.9,
n_replacements=1,
sigma=0.25,
alpha=0.25,
default_adam_learning_rate=0.001,
calc_mixture=False,
mixture_sigma=0.01,
score_sample_size=10000,
discriminator_skip_each_nth_step=0,
enable_selection=True,
fitness_sample_size=10000,
calculate_net_weights_dist=False,
fitness_mode="worst",
es_score_sample_size=10000,
es_random_init=False,
checkpoint_period=0,
):
super().__init__(
dataloader,
network_factory,
population_size,
tournament_size,
mutation_probability,
n_replacements,
sigma,
alpha,
)
self.batch_number = 0
self.cc = ConfigurationContainer.instance()
self._default_adam_learning_rate = self.settings.get(
"default_adam_learning_rate", default_adam_learning_rate)
self._discriminator_skip_each_nth_step = self.settings.get(
"discriminator_skip_each_nth_step",
discriminator_skip_each_nth_step,
)
self._enable_selection = self.settings.get("enable_selection",
enable_selection)
self.mixture_sigma = self.settings.get("mixture_sigma", mixture_sigma)
self.neighbourhood = Neighbourhood.instance()
for i, individual in enumerate(self.population_gen.individuals):
individual.learning_rate = self.settings.get(
"default_g_adam_learning_rate",
self._default_adam_learning_rate,
)
individual.id = "{}/G{}".format(self.neighbourhood.cell_number, i)
for i, individual in enumerate(self.population_dis.individuals):
individual.learning_rate = self.settings.get(
"default_d_adam_learning_rate",
self._default_adam_learning_rate,
)
individual.id = "{}/D{}".format(self.neighbourhood.cell_number, i)
self.concurrent_populations = ConcurrentPopulations.instance()
self.concurrent_populations.generator = self.population_gen
self.concurrent_populations.discriminator = self.population_dis
self.concurrent_populations.unlock()
experiment_id = self.cc.settings["general"]["logging"].get(
"experiment_id", None)
self.db_logger = DbLogger(current_experiment=experiment_id)
if "fitness" in self.settings:
self.fitness_sample_size = self.settings["fitness"].get(
"fitness_sample_size", fitness_sample_size)
self.fitness_loaded = self.dataloader.load()
self.fitness_iterator = iter(
self.fitness_loaded) # Create iterator for fitness loader
# Determine how to aggregate fitness calculated among neighbourhood
self.fitness_mode = self.settings["fitness"].get(
"fitness_mode", fitness_mode)
if self.fitness_mode not in ["worse", "best", "average"]:
raise NotImplementedError(
"Invalid argument for fitness_mode: {}".format(
self.fitness_mode))
else:
# TODO: Add code for safe implementation & error handling
raise KeyError(
"Fitness section must be defined in configuration file")
n_iterations = self.cc.settings["trainer"].get("n_iterations", 0)
if ("score" in self.settings and self.settings["score"].get(
"enabled",
calc_mixture)) or "optimize_mixture" in self.settings:
self.score_calc = ScoreCalculatorFactory.create()
self.score_sample_size = self.settings["score"].get(
"sample_size", score_sample_size)
self.score = float(
"inf") if self.score_calc.is_reversed else float("-inf")
self.mixture_generator_samples_mode = self.cc.settings["trainer"][
"mixture_generator_samples_mode"]
else:
self.score_sample_size = score_sample_size
self.score_calc = None
self.score = 0
if "optimize_mixture" in self.settings:
self.optimize_weights_at_the_end = self.settings[
"optimize_mixture"].get("enabled", True)
self.score_sample_size = self.settings["optimize_mixture"].get(
"sample_size", es_score_sample_size)
self.es_generations = self.settings["optimize_mixture"].get(
"es_generations", n_iterations)
self.es_random_init = self.settings["optimize_mixture"].get(
"es_random_init", es_random_init)
self.mixture_sigma = self.settings["optimize_mixture"].get(
"mixture_sigma", mixture_sigma)
self.mixture_generator_samples_mode = self.cc.settings["trainer"][
"mixture_generator_samples_mode"]
else:
self.optimize_weights_at_the_end = True
self.score_sample_size = es_score_sample_size
self.es_generations = n_iterations
self.es_random_init = es_random_init
self.mixture_sigma = mixture_sigma
self.mixture_generator_samples_mode = self.cc.settings["trainer"][
"mixture_generator_samples_mode"]
assert 0 <= checkpoint_period <= n_iterations, (
"Checkpoint period paramenter (checkpoint_period) should be "
"between 0 and the number of iterations (n_iterations).")
self.checkpoint_period = self.cc.settings["general"].get(
"checkpoint_period", checkpoint_period)
def train(self, n_iterations, stop_event=None):
loaded = self.dataloader.load()
alpha = None #self.neighbourhood.alpha
beta = None #self.neighbourhood.beta
if alpha is not None:
self._logger.info(f"Alpha is {alpha} and Beta is {beta}")
else:
self._logger.debug("Alpha and Beta are not set")
for iteration in range(n_iterations):
self._logger.debug("Iteration {} started".format(iteration + 1))
start_time = time()
all_generators = self.neighbourhood.all_generators
all_discriminators = self.neighbourhood.all_discriminators
local_generators = self.neighbourhood.local_generators
local_discriminators = self.neighbourhood.local_discriminators
# Log the name of individuals in entire neighborhood and local individuals for every iteration
# (to help tracing because individuals from adjacent cells might be from different iterations)
self._logger.info(
"Neighborhood located in possition {} of the grid".format(
self.neighbourhood.grid_position))
self._logger.info(
"Generators in current neighborhood are {}".format([
individual.name
for individual in all_generators.individuals
]))
self._logger.info(
"Discriminators in current neighborhood are {}".format([
individual.name
for individual in all_discriminators.individuals
]))
self._logger.info(
"Local generators in current neighborhood are {}".format([
individual.name
for individual in local_generators.individuals
]))
self._logger.info(
"Local discriminators in current neighborhood are {}".format([
individual.name
for individual in local_discriminators.individuals
]))
self._logger.info(
"L2 distance between all generators weights: {}".format(
all_generators.net_weights_dist))
self._logger.info(
"L2 distance between all discriminators weights: {}".format(
all_discriminators.net_weights_dist))
new_populations = {}
# Create random dataset to evaluate fitness in each iterations
(
fitness_samples,
fitness_labels,
) = self.generate_random_fitness_samples(self.fitness_sample_size)
if (self.cc.settings["dataloader"]["dataset_name"] == "celeba" or
self.cc.settings["dataloader"]["dataset_name"] == "cifar"
or self.cc.settings["network"]["name"]
== "ssgan_convolutional_mnist"):
fitness_samples = to_pytorch_variable(fitness_samples)
fitness_labels = to_pytorch_variable(fitness_labels)
elif self.cc.settings["dataloader"][
"dataset_name"] == "network_traffic":
fitness_samples = to_pytorch_variable(
generate_random_sequences(self.fitness_sample_size))
else:
fitness_samples = to_pytorch_variable(
fitness_samples.view(self.fitness_sample_size, -1))
fitness_labels = to_pytorch_variable(
fitness_labels.view(self.fitness_sample_size, -1))
fitness_labels = torch.squeeze(fitness_labels)
# Fitness evaluation
self._logger.debug("Evaluating fitness")
self.evaluate_fitness(
all_generators,
all_discriminators,
fitness_samples,
self.fitness_mode,
)
self.evaluate_fitness(
all_discriminators,
all_generators,
fitness_samples,
self.fitness_mode,
labels=fitness_labels,
logger=self._logger,
alpha=alpha,
beta=beta,
iter=iteration,
log_class_distribution=True,
)
self._logger.debug("Finished evaluating fitness")
# Tournament selection
if self._enable_selection:
self._logger.debug("Started tournament selection")
new_populations[TYPE_GENERATOR] = self.tournament_selection(
all_generators, TYPE_GENERATOR, is_logging=True)
new_populations[
TYPE_DISCRIMINATOR] = self.tournament_selection(
all_discriminators,
TYPE_DISCRIMINATOR,
is_logging=True)
self._logger.debug("Finished tournament selection")
self.batch_number = 0
data_iterator = iter(loaded)
while self.batch_number < len(loaded):
if self.cc.settings["dataloader"][
"dataset_name"] == "network_traffic":
input_data = to_pytorch_variable(next(data_iterator))
batch_size = input_data.size(0)
else:
input_data, labels = next(data_iterator)
batch_size = input_data.size(0)
input_data = to_pytorch_variable(
self.dataloader.transpose_data(input_data))
labels = to_pytorch_variable(
self.dataloader.transpose_data(labels))
labels = torch.squeeze(labels)
# Quit if requested
if stop_event is not None and stop_event.is_set():
self._logger.warning("External stop requested.")
return self.result()
attackers = new_populations[
TYPE_GENERATOR] if self._enable_selection else local_generators
defenders = new_populations[
TYPE_DISCRIMINATOR] if self._enable_selection else all_discriminators
input_data = self.step(
local_generators,
attackers,
defenders,
input_data,
self.batch_number,
loaded,
data_iterator,
iter=iteration,
)
if (self._discriminator_skip_each_nth_step == 0
or self.batch_number %
(self._discriminator_skip_each_nth_step + 1) == 0):
self._logger.debug("Skipping discriminator step")
attackers = new_populations[
TYPE_DISCRIMINATOR] if self._enable_selection else local_discriminators
defenders = new_populations[
TYPE_GENERATOR] if self._enable_selection else all_generators
input_data = self.step(
local_discriminators,
attackers,
defenders,
input_data,
self.batch_number,
loaded,
data_iterator,
labels=labels,
alpha=alpha,
beta=beta,
iter=iteration,
)
self._logger.info("Iteration {}, Batch {}/{}".format(
iteration + 1, self.batch_number, len(loaded)))
# If n_batches is set to 0, all batches will be used
if self.is_last_batch(self.batch_number):
break
self.batch_number += 1
# Perform selection first before mutation of mixture_weights
# Replace the worst with the best new
if self._enable_selection:
# Evaluate fitness of new_populations against neighborhood
self.evaluate_fitness(
new_populations[TYPE_GENERATOR],
all_discriminators,
fitness_samples,
self.fitness_mode,
)
self.evaluate_fitness(
new_populations[TYPE_DISCRIMINATOR],
all_generators,
fitness_samples,
self.fitness_mode,
labels=fitness_labels,
alpha=alpha,
beta=beta,
iter=iteration,
)
self.concurrent_populations.lock()
local_generators.replacement(
new_populations[TYPE_GENERATOR],
self._n_replacements,
is_logging=True,
)
local_generators.sort_population(is_logging=True)
local_discriminators.replacement(
new_populations[TYPE_DISCRIMINATOR],
self._n_replacements,
is_logging=True,
)
local_discriminators.sort_population(is_logging=True)
self.concurrent_populations.unlock()
# Update individuals' iteration and id after replacement and logging to ease tracing
for i, individual in enumerate(local_generators.individuals):
individual.id = "{}/G{}".format(
self.neighbourhood.cell_number, i)
individual.iteration = iteration + 1
for i, individual in enumerate(
local_discriminators.individuals):
individual.id = "{}/D{}".format(
self.neighbourhood.cell_number, i)
individual.iteration = iteration + 1
else:
# Re-evaluate fitness of local_generators and local_discriminators against neighborhood
self.evaluate_fitness(
local_generators,
all_discriminators,
fitness_samples,
self.fitness_mode,
)
self.evaluate_fitness(
local_discriminators,
all_generators,
fitness_samples,
self.fitness_mode,
labels=fitness_labels,
alpha=alpha,
beta=beta,
iter=iteration,
)
self.compute_mixture_generative_score(iteration)
stop_time = time()
path_real_images, path_fake_images = self.log_results(
batch_size,
iteration,
input_data,
loaded,
lr_gen=self.concurrent_populations.generator.individuals[0].
learning_rate,
lr_dis=self.concurrent_populations.discriminator.
individuals[0].learning_rate,
score=self.score,
mixture_gen=self.neighbourhood.mixture_weights_generators,
mixture_dis=None,
)
if self.db_logger.is_enabled:
self.db_logger.log_results(
iteration,
self.neighbourhood,
self.concurrent_populations,
self.score,
stop_time - start_time,
path_real_images,
path_fake_images,
)
if self.checkpoint_period > 0 and (
iteration + 1) % self.checkpoint_period == 0:
self.save_checkpoint(
all_generators.individuals,
all_discriminators.individuals,
self.neighbourhood.cell_number,
self.neighbourhood.grid_position,
)
# Evaluate the discriminators when addressing Semi-supervised Learning
if "ssgan" in self.cc.settings["network"]["name"]:
discriminator = self.concurrent_populations.discriminator.individuals[
0].genome
batch_size = self.dataloader.batch_size
dataloader_loaded = self.dataloader.load(train=True)
self.test_accuracy_discriminators(discriminator,
dataloader_loaded,
train=True)
self.dataloader.batch_size = 100
dataloader_loaded = self.dataloader.load(train=False)
self.test_accuracy_discriminators(discriminator,
dataloader_loaded,
train=False)
discriminators = [
individual.genome for individual in
self.neighbourhood.all_discriminators.individuals
]
for model in discriminators:
dataloader_loaded = self.dataloader.load(train=False)
self.test_accuracy_discriminators(model,
dataloader_loaded,
train=False)
dataloader_loaded = self.dataloader.load(train=False)
self.test_majority_voting_discriminators(discriminators,
dataloader_loaded,
train=False)
self.dataloader.batch_size = batch_size
if self.optimize_weights_at_the_end:
self.optimize_generator_mixture_weights()
path_real_images, path_fake_images = self.log_results(
batch_size,
iteration + 1,
input_data,
loaded,
lr_gen=self.concurrent_populations.generator.individuals[0].
learning_rate,
lr_dis=self.concurrent_populations.discriminator.
individuals[0].learning_rate,
score=self.score,
mixture_gen=self.neighbourhood.mixture_weights_generators,
mixture_dis=self.neighbourhood.mixture_weights_discriminators,
)
if self.db_logger.is_enabled:
self.db_logger.log_results(
iteration + 1,
self.neighbourhood,
self.concurrent_populations,
self.score,
stop_time - start_time,
path_real_images,
path_fake_images,
)
return self.result()
def test_majority_voting_discriminators(self,
models,
test_loader,
train=False):
correct = 0
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
train_or_test = "Train" if train else "Test"
with torch.no_grad():
for data, target in test_loader:
data, target = data.to(device), target.to(device)
if self.cc.settings["network"]["name"] == "ssgan_perceptron":
data = data.view(-1, 784)
elif self.cc.settings["network"][
"name"] == "ssgan_conv_mnist_28x28":
data = data.view(-1, 1, 28, 28)
elif self.cc.settings["network"]["name"] == "ssgan_svhn":
data = data.view(-1, 3, 32, 32)
else:
if self.cc.settings["dataloader"][
"dataset_name"] == "cifar":
data = data.view(-1, 3, 64, 64)
else:
data = data.view(-1, 1, 64, 64)
pred_accumulator = []
for model in models:
output = model.classification_layer(model.net(data))
output = output.view(-1, 11)
pred = output.argmax(dim=1, keepdim=True)
pred_accumulator.append(pred.view(-1))
label_votes = to_pytorch_variable(
torch.tensor(list(zip(*pred_accumulator))))
prediction = to_pytorch_variable(
torch.tensor([
labels.bincount(minlength=11).argmax()
for labels in label_votes
]))
correct += prediction.eq(
target.view_as(prediction)).sum().item()
num_samples = len(test_loader.dataset)
accuracy = 100.0 * float(correct / num_samples)
self._logger.info(
f"Majority Voting {train_or_test} Accuracy: {correct}/{num_samples} ({accuracy}%)"
)
def test_accuracy_discriminators(self, model, test_loader, train=False):
correct = 0
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
train_or_test = "Train" if train else "Test"
with torch.no_grad():
for data, target in test_loader:
data, target = data.to(device), target.to(device)
if self.cc.settings["network"]["name"] == "ssgan_perceptron":
data = data.view(-1, 784)
elif self.cc.settings["network"][
"name"] == "ssgan_conv_mnist_28x28":
data = data.view(-1, 1, 28, 28)
elif self.cc.settings["network"]["name"] == "ssgan_svhn":
data = data.view(-1, 3, 32, 32)
elif self.cc.settings["dataloader"]["dataset_name"] == "cifar":
data = data.view(-1, 3, 64, 64)
else:
data = data.view(-1, 1, 64, 64)
output = model.classification_layer(model.net(data))
output = output.view(-1, 11)
pred = output.argmax(dim=1, keepdim=True)
correct += pred.eq(target.view_as(pred)).sum().item()
num_samples = len(test_loader.dataset)
accuracy = 100.0 * float(correct / num_samples)
self._logger.info(
f"{train_or_test} Accuracy: {correct}/{num_samples} ({accuracy}%)")
def optimize_generator_mixture_weights(self):
generators = self.neighbourhood.best_generators
weights_generators = self.neighbourhood.mixture_weights_generators
# Not necessary for single-cell grids, as mixture must always be [1]
if self.neighbourhood.grid_size == 1:
return
# Create random vector from latent space
z_noise = noise(self.score_sample_size,
generators.individuals[0].genome.data_size)
# Include option to start from random weights
if self.es_random_init:
aux_weights = np.random.rand(len(weights_generators))
aux_weights /= np.sum(aux_weights)
weights_generators = OrderedDict(
zip(weights_generators.keys(), aux_weights))
self.neighbourhood.mixture_weights_generators = weights_generators
dataset = MixedGeneratorDataset(
generators,
weights_generators,
self.score_sample_size,
self.mixture_generator_samples_mode,
z_noise,
)
self.score = self.score_calc.calculate(dataset)[0]
init_score = self.score
self._logger.info(
"Mixture weight mutation - Starting mixture weights optimization ..."
)
self._logger.info("Init score: {}\tInit weights: {}.".format(
init_score, weights_generators))
for g in range(self.es_generations):
# Mutate mixture weights
z = np.random.normal(loc=0,
scale=self.mixture_sigma,
size=len(weights_generators))
transformed = np.asarray(
[value for _, value in weights_generators.items()])
transformed += z
# Don't allow negative values, normalize to sum of 1.0
transformed = np.clip(transformed, 0, None)
transformed /= np.sum(transformed)
new_mixture_weights = OrderedDict(
zip(weights_generators.keys(), transformed))
# TODO: Testing the idea of not generating the images again
dataset = MixedGeneratorDataset(
generators,
new_mixture_weights,
self.score_sample_size,
self.mixture_generator_samples_mode,
z_noise,
epoch=g)
if self.score_calc is not None:
score_after_mutation = self.score_calc.calculate(dataset)[0]
self._logger.info(
"Mixture weight mutation - Generation: {} \tScore of new weights: {}\tNew weights: {}."
.format(g, score_after_mutation, new_mixture_weights))
# For fid the lower the better, for inception_score, the higher the better
if (score_after_mutation < self.score
and self.score_calc.is_reversed) or (
score_after_mutation > self.score and
(not self.score_calc.is_reversed)):
weights_generators = new_mixture_weights
self.score = score_after_mutation
self._logger.info(
"Mixture weight mutation - Generation: {} \tNew score: {}\tWeights changed to: {}."
.format(g, self.score, weights_generators))
self.neighbourhood.mixture_weights_generators = weights_generators
self._logger.info(
"Mixture weight mutation - Score before mixture weight optimzation: {}\tScore after mixture weight optimzation: {}."
.format(init_score, self.score))
def step(
self,
original,
attacker,
defender,
input_data,
i,
loaded,
data_iterator,
labels=None,
alpha=None,
beta=None,
iter=None,
):
self.mutate_hyperparams(attacker)
return self.update_genomes(
attacker,
defender,
input_data,
loaded,
data_iterator,
labels=labels,
alpha=alpha,
beta=beta,
iter=iter,
)
def is_last_batch(self, i):
return self.dataloader.n_batches != 0 and self.dataloader.n_batches - 1 == i
def result(self):
return (
(
self.concurrent_populations.generator.individuals[0].genome,
self.concurrent_populations.generator.individuals[0].fitness,
),
(
self.concurrent_populations.discriminator.individuals[0].
genome,
self.concurrent_populations.discriminator.individuals[0].
fitness,
),
)
def mutate_hyperparams(self, population):
loc = -(self._default_adam_learning_rate / 10)
deltas = np.random.normal(
loc=loc,
scale=self._default_adam_learning_rate,
size=len(population.individuals),
)
deltas[np.random.rand(*deltas.shape) < 1 -
self._mutation_probability] = 0
for i, individual in enumerate(population.individuals):
individual.learning_rate = max(
0, individual.learning_rate + deltas[i] * self._alpha)
def update_genomes(
self,
population_attacker,
population_defender,
input_var,
loaded,
data_iterator,
labels=None,
alpha=None,
beta=None,
iter=None,
):
# TODO Currently picking random opponent, introduce parameter for this
defender = random.choice(population_defender.individuals).genome
for individual_attacker in population_attacker.individuals:
attacker = individual_attacker.genome
optimizer = torch.optim.Adam(
attacker.net.parameters(),
lr=individual_attacker.learning_rate,
betas=(0.5, 0.999),
)
# Restore previous state dict, if available
if individual_attacker.optimizer_state is not None:
optimizer.load_state_dict(individual_attacker.optimizer_state)
if labels is None:
loss = attacker.compute_loss_against(defender, input_var)[0]
else:
loss = attacker.compute_loss_against(
defender,
input_var,
labels=labels,
alpha=alpha,
beta=beta,
iter=iter,
)[0]
attacker.net.zero_grad()
defender.net.zero_grad()
loss.backward()
optimizer.step()
individual_attacker.optimizer_state = optimizer.state_dict()
return input_var
@staticmethod
def evaluate_fitness(
population_attacker,
population_defender,
input_var,
fitness_mode,
labels=None,
logger=None,
alpha=None,
beta=None,
iter=None,
log_class_distribution=False,
):
# Single direction only: Evaluate fitness of attacker based on defender
# TODO: Simplify and refactor this function
def compare_fitness(curr_fitness, fitness, mode):
# The initial fitness value is -inf before evaluation started, so we
# directly adopt the curr_fitness when -inf is encountered
if mode == "best":
if curr_fitness < fitness or fitness == float("-inf"):
return curr_fitness
elif mode == "worse":
if curr_fitness > fitness or fitness == float("-inf"):
return curr_fitness
elif mode == "average":
if fitness == float("-inf"):
return curr_fitness
else:
return fitness + curr_fitness
return fitness
for individual_attacker in population_attacker.individuals:
individual_attacker.fitness = float(
"-inf"
) # Reinitalize before evaluation started (Needed for average fitness)
for individual_defender in population_defender.individuals:
if labels is None:
fitness_attacker = float(
individual_attacker.genome.compute_loss_against(
individual_defender.genome, input_var)[0])
else:
fitness_attacker = float(
individual_attacker.genome.compute_loss_against(
individual_defender.genome,
input_var,
labels=labels,
alpha=alpha,
beta=beta,
iter=iter,
)[0])
individual_attacker.fitness = compare_fitness(
fitness_attacker, individual_attacker.fitness,
fitness_mode)
if fitness_mode == "average":
individual_attacker.fitness /= len(
population_defender.individuals)
if labels is not None and logger is not None and population_defender.individuals[
0].name == "SemiSupervised":
gen = None
for g in population_defender.individuals:
if g.is_local:
gen = g
break
dis = None
for d in population_attacker.individuals:
if d.is_local:
dis = d
break
generator = gen.genome
discriminator = dis.genome
discriminator_output = discriminator.compute_loss_against(
generator,
input_var,
labels=labels,
alpha=alpha,
beta=beta,
iter=iter,
log_class_distribution=log_class_distribution,
)
accuracy = discriminator_output[2]
if discriminator.name == "SemiSupervisedDiscriminator" and accuracy is not None:
logger.info(
f"Iteration {iter}, Label Prediction Accuracy: {100 * accuracy}% "
)
def compute_mixture_generative_score(self, epoch=None):
# Not necessary for single-cell grids, as mixture must always be [1]
self._logger.info("Calculating score {}.".format(epoch))
best_generators = self.neighbourhood.best_generators
if True or self.neighbourhood.grid_size == 1:
if self.score_calc is not None:
dataset = MixedGeneratorDataset(
best_generators,
self.neighbourhood.mixture_weights_generators,
self.score_sample_size,
self.cc.settings["trainer"]
["mixture_generator_samples_mode"],
# epoch=epoch
)
self.score = self.score_calc.calculate(dataset)[0]
def generate_random_fitness_samples(self, fitness_sample_size):
"""
Generate random samples for fitness evaluation according to fitness_sample_size
Abit of hack, use iterator of batch_size to sample data of fitness_sample_size
TODO Implement another iterator (and dataloader) of fitness_sample_size
"""
def get_next_batch(iterator, loaded):
# Handle if the end of iterator is reached
try:
input, labels = next(iterator)
return input, labels, iterator
except StopIteration:
# Use a new iterator
iterator = iter(loaded)
input, labels = next(iterator)
return input, labels, iterator
sampled_data, sampled_labels, self.fitness_iterator = get_next_batch(
self.fitness_iterator, self.fitness_loaded)
batch_size = sampled_data.size(0)
if fitness_sample_size < batch_size:
return (
sampled_data[:fitness_sample_size],
sampled_labels[:fitness_sample_size],
)
else:
fitness_sample_size -= batch_size
while fitness_sample_size >= batch_size:
# Keep concatenate a full batch of data
curr_data, curr_labels, self.fitness_iterator = get_next_batch(
self.fitness_iterator, self.fitness_loaded)
sampled_data = torch.cat((sampled_data, curr_data), 0)
sampled_labels = torch.cat((sampled_labels, curr_labels), 0)
fitness_sample_size -= batch_size
if fitness_sample_size > 0:
# Concatenate partial batch of data
curr_data, curr_labels, self.fitness_iterator = get_next_batch(
self.fitness_iterator, self.fitness_loaded)
sampled_data = torch.cat(
(sampled_data, curr_data[:fitness_sample_size]), 0)
sampled_labels = torch.cat(
(sampled_labels, curr_labels[:fitness_sample_size]), 0)
return sampled_data, sampled_labels
def __init__(self,
dataloader,
network_factory,
population_size=10,
tournament_size=2,
mutation_probability=0.9,
n_replacements=1,
sigma=0.25,
alpha=0.25,
default_adam_learning_rate=0.001,
calc_mixture=False,
mixture_sigma=0.01,
score_sample_size=10000,
discriminator_skip_each_nth_step=0,
enable_selection=True,
fitness_sample_size=10000,
calculate_net_weights_dist=False,
fitness_mode='worst'):
super().__init__(dataloader, network_factory, population_size,
tournament_size, mutation_probability, n_replacements,
sigma, alpha)
self.batch_number = 0
self.cc = ConfigurationContainer.instance()
self._default_adam_learning_rate = self.settings.get(
'default_adam_learning_rate', default_adam_learning_rate)
self._discriminator_skip_each_nth_step = self.settings.get(
'discriminator_skip_each_nth_step',
discriminator_skip_each_nth_step)
self._enable_selection = self.settings.get('enable_selection',
enable_selection)
self.mixture_sigma = self.settings.get('mixture_sigma', mixture_sigma)
self.neighbourhood = Grid.instance()
for i, individual in enumerate(self.population_gen.individuals):
individual.learning_rate = self._default_adam_learning_rate
individual.id = '{}/G{}'.format(self.neighbourhood.cell_number, i)
for i, individual in enumerate(self.population_dis.individuals):
individual.learning_rate = self._default_adam_learning_rate
individual.id = '{}/D{}'.format(self.neighbourhood.cell_number, i)
# TRACE: Se genera un lock para setear la población? Usa multithread lock
# Faltaria revisar si singleton es thread safe
self.concurrent_populations = ConcurrentPopulations.instance()
self.concurrent_populations.generator = self.population_gen
self.concurrent_populations.discriminator = self.population_dis
if self.concurrent_populations.locked():
self.concurrent_populations.unlock()
experiment_id = self.cc.settings['general']['logging'].get(
'experiment_id', None)
self.db_logger = DbLogger(current_experiment=experiment_id)
if 'score' in self.settings and self.settings['score'].get(
'enabled', calc_mixture):
self.score_calc = ScoreCalculatorFactory.create()
self.score_sample_size = self.settings['score'].get(
'sample_size', score_sample_size)
self.score = float(
'inf') if self.score_calc.is_reversed else float('-inf')
else:
self.score_calc = None
self.score = 0
if 'fitness' in self.settings:
self.fitness_sample_size = self.settings['fitness'].get(
'fitness_sample_size', fitness_sample_size)
self.fitness_loaded = self.dataloader.load()
self.fitness_iterator = iter(
self.fitness_loaded) # Create iterator for fitness loader
# Determine how to aggregate fitness calculated among neighbourhood
self.fitness_mode = self.settings['fitness'].get(
'fitness_mode', fitness_mode)
if self.fitness_mode not in ['worse', 'best', 'average']:
raise NotImplementedError(
"Invalid argument for fitness_mode: {}".format(
self.fitness_mode))
else:
# TODO: Add code for safe implementation & error handling
raise KeyError(
"Fitness section must be defined in configuration file")
class LipizzanerGANTrainer(EvolutionaryAlgorithmTrainer):
"""
Distributed, asynchronous trainer for coevolutionary GANs. Uses the standard Goodfellow GAN approach.
(Without discriminator mixture)
"""
def __init__(self,
dataloader,
network_factory,
population_size=10,
tournament_size=2,
mutation_probability=0.9,
n_replacements=1,
sigma=0.25,
alpha=0.25,
default_adam_learning_rate=0.001,
calc_mixture=False,
mixture_sigma=0.01,
score_sample_size=10000,
discriminator_skip_each_nth_step=0,
enable_selection=True,
fitness_sample_size=10000,
calculate_net_weights_dist=False,
fitness_mode='worst'):
super().__init__(dataloader, network_factory, population_size,
tournament_size, mutation_probability, n_replacements,
sigma, alpha)
self.batch_number = 0
self.cc = ConfigurationContainer.instance()
self._default_adam_learning_rate = self.settings.get(
'default_adam_learning_rate', default_adam_learning_rate)
self._discriminator_skip_each_nth_step = self.settings.get(
'discriminator_skip_each_nth_step',
discriminator_skip_each_nth_step)
self._enable_selection = self.settings.get('enable_selection',
enable_selection)
self.mixture_sigma = self.settings.get('mixture_sigma', mixture_sigma)
self.neighbourhood = Grid.instance()
for i, individual in enumerate(self.population_gen.individuals):
individual.learning_rate = self._default_adam_learning_rate
individual.id = '{}/G{}'.format(self.neighbourhood.cell_number, i)
for i, individual in enumerate(self.population_dis.individuals):
individual.learning_rate = self._default_adam_learning_rate
individual.id = '{}/D{}'.format(self.neighbourhood.cell_number, i)
# TRACE: Se genera un lock para setear la población? Usa multithread lock
# Faltaria revisar si singleton es thread safe
self.concurrent_populations = ConcurrentPopulations.instance()
self.concurrent_populations.generator = self.population_gen
self.concurrent_populations.discriminator = self.population_dis
if self.concurrent_populations.locked():
self.concurrent_populations.unlock()
experiment_id = self.cc.settings['general']['logging'].get(
'experiment_id', None)
self.db_logger = DbLogger(current_experiment=experiment_id)
if 'score' in self.settings and self.settings['score'].get(
'enabled', calc_mixture):
self.score_calc = ScoreCalculatorFactory.create()
self.score_sample_size = self.settings['score'].get(
'sample_size', score_sample_size)
self.score = float(
'inf') if self.score_calc.is_reversed else float('-inf')
else:
self.score_calc = None
self.score = 0
if 'fitness' in self.settings:
self.fitness_sample_size = self.settings['fitness'].get(
'fitness_sample_size', fitness_sample_size)
self.fitness_loaded = self.dataloader.load()
self.fitness_iterator = iter(
self.fitness_loaded) # Create iterator for fitness loader
# Determine how to aggregate fitness calculated among neighbourhood
self.fitness_mode = self.settings['fitness'].get(
'fitness_mode', fitness_mode)
if self.fitness_mode not in ['worse', 'best', 'average']:
raise NotImplementedError(
"Invalid argument for fitness_mode: {}".format(
self.fitness_mode))
else:
# TODO: Add code for safe implementation & error handling
raise KeyError(
"Fitness section must be defined in configuration file")
def train(self, n_iterations, stop_event=None):
loaded = self.dataloader.load()
for iteration in range(n_iterations):
self._logger.debug('Iteration {} started'.format(iteration + 1))
start_time = time()
local_generators = self.neighbourhood.local_generators
local_discriminators = self.neighbourhood.local_discriminators
all_generators, all_discriminators = self.neighbourhood.all_disc_gen_local(
)
# Local functions
# Log the name of individuals in entire neighborhood for every iteration
# (to help tracing because individuals from adjacent cells might be from different iterations)
self._logger.info(
'Generators in current neighborhood are {}'.format([
individual.name
for individual in all_generators.individuals
]))
self._logger.info(
'Discriminators in current neighborhood are {}'.format([
individual.name
for individual in all_discriminators.individuals
]))
# TODO: Fixme
# self._logger.info('L2 distance between all generators weights: {}'.format(all_generators.net_weights_dist))
# self._logger.info('L2 distance between all discriminators weights: {}'.format(all_discriminators.net_weights_dist))
new_populations = {}
# Create random dataset to evaluate fitness in each iterations
fitness_samples = self.generate_random_fitness_samples(
self.fitness_sample_size)
if self.cc.settings['dataloader']['dataset_name'] == 'celeba' \
or self.cc.settings['dataloader']['dataset_name'] == 'cifar':
fitness_samples = to_pytorch_variable(fitness_samples)
else:
fitness_samples = to_pytorch_variable(
fitness_samples.view(self.fitness_sample_size, -1))
# Fitness evaluation
self._logger.debug('Evaluating fitness')
self.evaluate_fitness(all_generators, all_discriminators,
fitness_samples, self.fitness_mode)
self.evaluate_fitness(all_discriminators, all_generators,
fitness_samples, self.fitness_mode)
self._logger.debug('Finished evaluating fitness')
# Tournament selection
if self._enable_selection:
self._logger.debug('Started tournament selection')
new_populations[TYPE_GENERATOR] = self.tournament_selection(
all_generators, TYPE_GENERATOR, is_logging=True)
new_populations[
TYPE_DISCRIMINATOR] = self.tournament_selection(
all_discriminators,
TYPE_DISCRIMINATOR,
is_logging=True)
self._logger.debug('Finished tournament selection')
self.batch_number = 0
data_iterator = iter(loaded)
while self.batch_number < len(loaded):
# for i, (input_data, labels) in enumerate(loaded):
input_data = next(data_iterator)[0]
batch_size = input_data.size(0)
input_data = to_pytorch_variable(
self.dataloader.transpose_data(input_data))
# Quit if requested
if stop_event is not None and stop_event.is_set():
self._logger.warning('External stop requested.')
return self.result()
attackers = new_populations[
TYPE_GENERATOR] if self._enable_selection else local_generators
defenders = new_populations[
TYPE_DISCRIMINATOR] if self._enable_selection else all_discriminators
input_data = self.step(local_generators, attackers, defenders,
input_data, self.batch_number, loaded,
data_iterator)
if self._discriminator_skip_each_nth_step == 0 or self.batch_number % (
self._discriminator_skip_each_nth_step + 1) == 0:
self._logger.debug('Skipping discriminator step')
attackers = new_populations[
TYPE_DISCRIMINATOR] if self._enable_selection else local_discriminators
defenders = new_populations[
TYPE_GENERATOR] if self._enable_selection else all_generators
input_data = self.step(local_discriminators, attackers,
defenders, input_data,
self.batch_number, loaded,
data_iterator)
self._logger.info('Iteration {}, Batch {}/{}'.format(
iteration + 1, self.batch_number, len(loaded)))
# If n_batches is set to 0, all batches will be used
if self.is_last_batch(self.batch_number):
break
self.batch_number += 1
# Perform selection first before mutation of mixture_weights
# Replace the worst with the best new
if self._enable_selection:
# Evaluate fitness of new_populations against neighborhood
self.evaluate_fitness(new_populations[TYPE_GENERATOR],
all_discriminators, fitness_samples,
self.fitness_mode)
self.evaluate_fitness(new_populations[TYPE_DISCRIMINATOR],
all_generators, fitness_samples,
self.fitness_mode)
self.concurrent_populations.lock()
local_generators.replacement(new_populations[TYPE_GENERATOR],
self._n_replacements,
is_logging=True)
local_generators.sort_population(is_logging=True)
local_discriminators.replacement(
new_populations[TYPE_DISCRIMINATOR],
self._n_replacements,
is_logging=True)
local_discriminators.sort_population(is_logging=True)
self.concurrent_populations.unlock()
# Update individuals' iteration and id after replacement and logging to ease tracing
for i, individual in enumerate(local_generators.individuals):
individual.id = '{}/G{}'.format(
self.neighbourhood.cell_number, i)
individual.iteration = iteration + 1
for i, individual in enumerate(
local_discriminators.individuals):
individual.id = '{}/D{}'.format(
self.neighbourhood.cell_number, i)
individual.iteration = iteration + 1
else:
# Re-evaluate fitness of local_generators and local_discriminators against neighborhood
self.evaluate_fitness(local_generators, all_discriminators,
fitness_samples, self.fitness_mode)
self.evaluate_fitness(local_discriminators, all_generators,
fitness_samples, self.fitness_mode)
# Mutate mixture weights after selection
self.mutate_mixture_weights_with_score(
input_data) # self.score is updated here
stop_time = time()
path_real_images, path_fake_images = \
self.log_results(batch_size, iteration, input_data, loaded,
lr_gen=self.concurrent_populations.generator.individuals[0].learning_rate,
lr_dis=self.concurrent_populations.discriminator.individuals[0].learning_rate,
score=self.score, mixture_gen=self.neighbourhood.mixture_weights_generators,
mixture_dis=None)
if self.db_logger.is_enabled:
self.db_logger.log_results(iteration, self.neighbourhood,
self.concurrent_populations,
self.score, stop_time - start_time,
path_real_images, path_fake_images)
return self.result()
def step(self, original, attacker, defender, input_data, i, loaded,
data_iterator):
# Don't execute for remote populations - needed if generator and discriminator are on different node
# if any(not ind.is_local for ind in original.individuals):
# return
self.mutate_hyperparams(attacker)
return self.update_genomes(attacker, defender, input_data, loaded,
data_iterator)
def is_last_batch(self, i):
return self.dataloader.n_batches != 0 and self.dataloader.n_batches - 1 == i
def result(self):
return (
(self.concurrent_populations.generator.individuals[0].genome,
self.concurrent_populations.generator.individuals[0].fitness),
(self.concurrent_populations.discriminator.individuals[0].genome,
self.concurrent_populations.discriminator.individuals[0].fitness))
def mutate_hyperparams(self, population):
loc = -(self._default_adam_learning_rate / 10)
deltas = np.random.normal(loc=loc,
scale=self._default_adam_learning_rate,
size=len(population.individuals))
deltas[np.random.rand(*deltas.shape) < 1 -
self._mutation_probability] = 0
for i, individual in enumerate(population.individuals):
individual.learning_rate = max(
0, individual.learning_rate + deltas[i] * self._alpha)
def update_genomes(self, population_attacker, population_defender,
input_var, loaded, data_iterator):
# TODO Currently picking random opponent, introduce parameter for this
defender = random.choice(population_defender.individuals).genome
for individual_attacker in population_attacker.individuals:
attacker = individual_attacker.genome
optimizer = torch.optim.Adam(attacker.net.parameters(),
lr=individual_attacker.learning_rate,
betas=(0.5, 0.999))
# Restore previous state dict, if available
if individual_attacker.optimizer_state is not None:
optimizer.load_state_dict(individual_attacker.optimizer_state)
loss = attacker.compute_loss_against(defender, input_var)[0]
attacker.net.zero_grad()
defender.net.zero_grad()
loss.backward()
optimizer.step()
individual_attacker.optimizer_state = optimizer.state_dict()
return input_var
@staticmethod
def evaluate_fitness(population_attacker, population_defender, input_var,
fitness_mode):
# Single direction only: Evaluate fitness of attacker based on defender
# TODO: Simplify and refactor this function
def compare_fitness(curr_fitness, fitness, mode):
# The initial fitness value is -inf before evaluation started, so we
# directly adopt the curr_fitness when -inf is encountered
if mode == 'best':
if curr_fitness < fitness or fitness == float('-inf'):
return curr_fitness
elif mode == 'worse':
if curr_fitness > fitness or fitness == float('-inf'):
return curr_fitness
elif mode == 'average':
if fitness == float('-inf'):
return curr_fitness
else:
return fitness + curr_fitness
return fitness
for individual_attacker in population_attacker.individuals:
individual_attacker.fitness = float(
'-inf'
) # Reinitalize before evaluation started (Needed for average fitness)
for individual_defender in population_defender.individuals:
# TRACE: Evalua atacante contra defensor
fitness_attacker = float(
individual_attacker.genome.compute_loss_against(
individual_defender.genome, input_var)[0])
# TRACE: Se que da con el mejor fitness?
individual_attacker.fitness = compare_fitness(
fitness_attacker, individual_attacker.fitness,
fitness_mode)
if fitness_mode == 'average':
individual_attacker.fitness /= len(
population_defender.individuals)
def mutate_mixture_weights_with_score(self, input_data):
# Not necessary for single-cell grids, as mixture must always be [1]
if self.neighbourhood.grid_size == 1:
if self.score_calc is not None:
self._logger.info('Calculating FID/inception score.')
best_generators = self.neighbourhood.best_generators_local()
dataset = MixedGeneratorDataset(
best_generators,
self.neighbourhood.mixture_weights_generators,
self.score_sample_size, self.cc.settings['trainer']
['mixture_generator_samples_mode'])
self.score = self.score_calc.calculate(dataset)[0]
else:
# Mutate mixture weights
z = np.random.normal(
loc=0,
scale=self.mixture_sigma,
size=len(self.neighbourhood.mixture_weights_generators))
transformed = np.asarray([
value for _, value in
self.neighbourhood.mixture_weights_generators.items()
])
transformed += z
# Don't allow negative values, normalize to sum of 1.0
transformed = np.clip(transformed, 0, None)
transformed /= np.sum(transformed)
new_mixture_weights_generators = OrderedDict(
zip(self.neighbourhood.mixture_weights_generators.keys(),
transformed))
best_generators = self.neighbourhood.best_generators_local()
dataset_before_mutation = MixedGeneratorDataset(
best_generators, self.neighbourhood.mixture_weights_generators,
self.score_sample_size,
self.cc.settings['trainer']['mixture_generator_samples_mode'])
dataset_after_mutation = MixedGeneratorDataset(
best_generators, new_mixture_weights_generators,
self.score_sample_size,
self.cc.settings['trainer']['mixture_generator_samples_mode'])
if self.score_calc is not None:
self._logger.info('Calculating FID/inception score.')
score_before_mutation = self.score_calc.calculate(
dataset_before_mutation)[0]
score_after_mutation = self.score_calc.calculate(
dataset_after_mutation)[0]
# For fid the lower the better, for inception_score, the higher the better
if (score_after_mutation < score_before_mutation and self.score_calc.is_reversed) \
or (score_after_mutation > score_before_mutation and (not self.score_calc.is_reversed)):
# Adopt the mutated mixture_weights only if the performance after mutation is better
self.neighbourhood.mixture_weights_generators = new_mixture_weights_generators
self.score = score_after_mutation
else:
# Do not adopt the mutated mixture_weights here
self.score = score_before_mutation
def generate_random_fitness_samples(self, fitness_sample_size):
"""
Generate random samples for fitness evaluation according to fitness_sample_size
Abit of hack, use iterator of batch_size to sample data of fitness_sample_size
TODO Implement another iterator (and dataloader) of fitness_sample_size
"""
def get_next_batch(iterator, loaded):
# Handle if the end of iterator is reached
try:
return next(iterator)[0], iterator
except StopIteration:
# Use a new iterator
iterator = iter(loaded)
return next(iterator)[0], iterator
sampled_data, self.fitness_iterator = get_next_batch(
self.fitness_iterator, self.fitness_loaded)
batch_size = sampled_data.size(0)
if fitness_sample_size < batch_size:
return sampled_data[:fitness_sample_size]
else:
fitness_sample_size -= batch_size
while fitness_sample_size >= batch_size:
# Keep concatenate a full batch of data
curr_data, self.fitness_iterator = get_next_batch(
self.fitness_iterator, self.fitness_loaded)
sampled_data = torch.cat((sampled_data, curr_data), 0)
fitness_sample_size -= batch_size
if fitness_sample_size > 0:
# Concatenate partial batch of data
curr_data, self.fitness_iterator = get_next_batch(
self.fitness_iterator, self.fitness_loaded)
sampled_data = torch.cat(
(sampled_data, curr_data[:fitness_sample_size]), 0)
return sampled_data
def __init__(self,
dataloader,
network_factory,
population_size=10,
tournament_size=2,
mutation_probability=0.9,
n_replacements=1,
sigma=0.25,
alpha=0.25,
default_adam_learning_rate=0.001,
calc_mixture=False,
mixture_sigma=0.01,
score_sample_size=10000,
discriminator_skip_each_nth_step=0,
enable_selection=True,
fitness_sample_size=10000,
calculate_net_weights_dist=False,
fitness_mode='worst',
es_generations=10,
es_score_sample_size=10000,
es_random_init=False,
checkpoint_period=0):
super().__init__(dataloader, network_factory, population_size,
tournament_size, mutation_probability, n_replacements,
sigma, alpha)
self.batch_number = 0
self.cc = ConfigurationContainer.instance()
self._default_adam_learning_rate = self.settings.get(
'default_adam_learning_rate', default_adam_learning_rate)
self._discriminator_skip_each_nth_step = self.settings.get(
'discriminator_skip_each_nth_step',
discriminator_skip_each_nth_step)
self._enable_selection = self.settings.get('enable_selection',
enable_selection)
self.mixture_sigma = self.settings.get('mixture_sigma', mixture_sigma)
self.neighbourhood = Neighbourhood.instance()
for i, individual in enumerate(self.population_gen.individuals):
individual.learning_rate = self._default_adam_learning_rate
individual.id = '{}/G{}'.format(self.neighbourhood.cell_number, i)
for i, individual in enumerate(self.population_dis.individuals):
individual.learning_rate = self._default_adam_learning_rate
individual.id = '{}/D{}'.format(self.neighbourhood.cell_number, i)
self.concurrent_populations = ConcurrentPopulations.instance()
self.concurrent_populations.generator = self.population_gen
self.concurrent_populations.discriminator = self.population_dis
self.concurrent_populations.unlock()
experiment_id = self.cc.settings['general']['logging'].get(
'experiment_id', None)
self.db_logger = DbLogger(current_experiment=experiment_id)
if 'fitness' in self.settings:
self.fitness_sample_size = self.settings['fitness'].get(
'fitness_sample_size', fitness_sample_size)
self.fitness_loaded = self.dataloader.load()
self.fitness_iterator = iter(
self.fitness_loaded) # Create iterator for fitness loader
# Determine how to aggregate fitness calculated among neighbourhood
self.fitness_mode = self.settings['fitness'].get(
'fitness_mode', fitness_mode)
if self.fitness_mode not in ['worse', 'best', 'average']:
raise NotImplementedError(
"Invalid argument for fitness_mode: {}".format(
self.fitness_mode))
else:
# TODO: Add code for safe implementation & error handling
raise KeyError(
"Fitness section must be defined in configuration file")
if 'score' in self.settings and self.settings['score'].get(
'enabled', calc_mixture):
self.score_calc = ScoreCalculatorFactory.create()
self.score_sample_size = self.settings['score'].get(
'sample_size', score_sample_size)
self.score = float(
'inf') if self.score_calc.is_reversed else float('-inf')
self.mixture_generator_samples_mode = self.cc.settings['trainer'][
'mixture_generator_samples_mode']
elif 'optimize_mixture' in self.settings:
self.score_calc = ScoreCalculatorFactory.create()
self.score = float(
'inf') if self.score_calc.is_reversed else float('-inf')
else:
self.score_sample_size = score_sample_size
self.score_calc = None
self.score = 0
if 'optimize_mixture' in self.settings:
self.optimize_weights_at_the_end = True
self.score_sample_size = self.settings['optimize_mixture'].get(
'sample_size', es_score_sample_size)
self.es_generations = self.settings['optimize_mixture'].get(
'es_generations', es_generations)
self.es_random_init = self.settings['optimize_mixture'].get(
'es_random_init', es_random_init)
self.mixture_sigma = self.settings['optimize_mixture'].get(
'mixture_sigma', mixture_sigma)
self.mixture_generator_samples_mode = self.cc.settings['trainer'][
'mixture_generator_samples_mode']
else:
self.optimize_weights_at_the_end = False
n_iterations = self.cc.settings['trainer'].get('n_iterations', 0)
assert 0 <= checkpoint_period <= n_iterations, 'Checkpoint period paramenter (checkpoint_period) should be ' \
'between 0 and the number of iterations (n_iterations).'
self.checkpoint_period = self.cc.settings['general'].get(
'checkpoint_period', checkpoint_period)
class LipizzanerGANTrainer(EvolutionaryAlgorithmTrainer):
"""
Distributed, asynchronous trainer for coevolutionary GANs. Uses the standard Goodfellow GAN approach.
"""
def __init__(self,
dataloader,
network_factory,
population_size=10,
tournament_size=2,
mutation_probability=0.9,
n_replacements=1,
sigma=0.25,
alpha=0.25,
default_adam_learning_rate=0.001,
calc_mixture=False,
mixture_sigma=0.01,
score_sample_size=10000,
discriminator_skip_each_nth_step=0,
enable_selection=True):
super().__init__(dataloader, network_factory, population_size,
tournament_size, mutation_probability, n_replacements,
sigma, alpha)
self.batch_number = 0
self._default_adam_learning_rate = self.settings.get(
'default_adam_learning_rate', default_adam_learning_rate)
self._discriminator_skip_each_nth_step = self.settings.get(
'discriminator_skip_each_nth_step',
discriminator_skip_each_nth_step)
self._enable_selection = self.settings.get('enable_selection',
enable_selection)
self.mixture_sigma = self.settings.get('mixture_sigma', mixture_sigma)
self.neighbourhood = Neighbourhood.instance()
for i, individual in enumerate(self.population_gen.individuals):
individual.learning_rate = self._default_adam_learning_rate
individual.id = '{}/G{}'.format(self.neighbourhood.cell_number, i)
for i, individual in enumerate(self.population_dis.individuals):
individual.learning_rate = self._default_adam_learning_rate
individual.id = '{}/D{}'.format(self.neighbourhood.cell_number, i)
self.concurrent_populations = ConcurrentPopulations.instance()
self.concurrent_populations.generator = self.population_gen
self.concurrent_populations.discriminator = self.population_dis
self.concurrent_populations.unlock()
experiment_id = ConfigurationContainer.instance(
).settings['general']['logging'].get('experiment_id', None)
self.db_logger = DbLogger(current_experiment=experiment_id)
if 'score' in self.settings and self.settings['score'].get(
'enabled', calc_mixture):
self.score_calc = ScoreCalculatorFactory.create()
self.score_sample_size = self.settings['score'].get(
'sample_size', score_sample_size)
self.score = float(
'inf') if self.score_calc.is_reversed else float('-inf')
else:
self.score_calc = None
self.score = 0
def train(self, n_iterations, stop_event=None):
loaded = self.dataloader.load()
for iteration in range(n_iterations):
self._logger.debug('Iteration {} started'.format(iteration))
start_time = time()
all_generators = self.neighbourhood.all_generators
all_discriminators = self.neighbourhood.all_discriminators
local_generators = self.neighbourhood.local_generators
local_discriminators = self.neighbourhood.local_discriminators
new_populations = {}
self.batch_number = 0
data_iterator = iter(loaded)
while self.batch_number < len(loaded):
input_data = next(data_iterator)[0]
batch_size = input_data.size(0)
input_data = to_pytorch_variable(
self.dataloader.transpose_data(input_data))
if iteration == 0 and self.batch_number == 0:
self._logger.debug('Evaluating first fitness')
self.evaluate_fitness(local_generators, all_discriminators,
input_data)
self._logger.debug('Finished evaluating first fitness')
if self.batch_number == 0 and self._enable_selection:
self._logger.debug('Started tournamend selection')
new_populations[
TYPE_GENERATOR] = self.tournament_selection(
all_generators, TYPE_GENERATOR)
new_populations[
TYPE_DISCRIMINATOR] = self.tournament_selection(
all_discriminators, TYPE_DISCRIMINATOR)
self._logger.debug('Finished tournamend selection')
# Quit if requested
if stop_event is not None and stop_event.is_set():
self._logger.warning('External stop requested.')
return self.result()
attackers = new_populations[
TYPE_GENERATOR] if self._enable_selection else local_generators
defenders = new_populations[
TYPE_DISCRIMINATOR] if self._enable_selection else all_discriminators
input_data = self.step(
local_generators, attackers, defenders, input_data, loaded,
data_iterator,
self.neighbourhood.mixture_weights_discriminators)
if self._discriminator_skip_each_nth_step == 0 or self.batch_number % (
self._discriminator_skip_each_nth_step + 1) == 0:
attackers = new_populations[
TYPE_DISCRIMINATOR] if self._enable_selection else local_discriminators
defenders = new_populations[
TYPE_GENERATOR] if self._enable_selection else all_generators
input_data = self.step(
local_discriminators, attackers, defenders, input_data,
loaded, data_iterator,
self.neighbourhood.mixture_weights_generators)
self._logger.info('Batch {}/{} done'.format(
self.batch_number, len(loaded)))
# If n_batches is set to 0, all batches will be used
if self.is_last_batch(self.batch_number):
break
self.batch_number += 1
# Mutate mixture weights
weights_generators = self.neighbourhood.mixture_weights_generators
weights_discriminators = self.neighbourhood.mixture_weights_discriminators
generators = new_populations[
TYPE_GENERATOR] if self._enable_selection else all_generators
discriminators = new_populations[
TYPE_DISCRIMINATOR] if self._enable_selection else all_discriminators
self.mutate_mixture_weights(weights_generators,
weights_discriminators, generators,
discriminators, input_data)
self.mutate_mixture_weights(weights_discriminators,
weights_generators, discriminators,
generators, input_data)
# Replace the worst with the best new
if self._enable_selection:
self.evaluate_fitness(new_populations[TYPE_GENERATOR],
new_populations[TYPE_DISCRIMINATOR],
input_data)
self.concurrent_populations.lock()
local_generators.replacement(new_populations[TYPE_GENERATOR],
self._n_replacements)
local_generators.sort_population()
local_discriminators.replacement(
new_populations[TYPE_DISCRIMINATOR], self._n_replacements)
local_discriminators.sort_population()
self.concurrent_populations.unlock()
else:
self.evaluate_fitness(all_generators, all_discriminators,
input_data)
if self.score_calc is not None:
self._logger.info('Calculating FID/inception score.')
self.calculate_score()
stop_time = time()
path_real_images, path_fake_images = \
self.log_results(batch_size, iteration, input_data, loaded,
lr_gen=self.concurrent_populations.generator.individuals[0].learning_rate,
lr_dis=self.concurrent_populations.discriminator.individuals[0].learning_rate,
score=self.score, mixture_gen=self.neighbourhood.mixture_weights_generators,
mixture_dis=self.neighbourhood.mixture_weights_discriminators)
if self.db_logger.is_enabled:
self.db_logger.log_results(iteration, self.neighbourhood,
self.concurrent_populations,
self.score, stop_time - start_time,
path_real_images, path_fake_images)
return self.result()
def step(self, original, attacker, defender, input_data, loaded,
data_iterator, defender_weights):
# Don't execute for remote populations - needed if generator and discriminator are on different node
if any(not ind.is_local for ind in original.individuals):
return
self.mutate_hyperparams(attacker)
return self.update_genomes(attacker, defender, input_data, loaded,
data_iterator, defender_weights)
def is_last_batch(self, i):
return self.dataloader.n_batches != 0 and self.dataloader.n_batches - 1 == i
def result(self):
return (
(self.concurrent_populations.generator.individuals[0].genome,
self.concurrent_populations.generator.individuals[0].fitness),
(self.concurrent_populations.discriminator.individuals[0].genome,
self.concurrent_populations.discriminator.individuals[0].fitness))
def mutate_hyperparams(self, population):
loc = -(self._default_adam_learning_rate / 10)
deltas = np.random.normal(loc=loc,
scale=self._default_adam_learning_rate,
size=len(population.individuals))
deltas[np.random.rand(*deltas.shape) < 1 -
self._mutation_probability] = 0
for i, individual in enumerate(population.individuals):
individual.learning_rate = max(
0, individual.learning_rate + deltas[i] * self._alpha)
def update_genomes(self, population_attacker, population_defender,
input_var, loaded, data_iterator, defender_weights):
for individual_attacker in population_attacker.individuals:
attacker = individual_attacker.genome
weights = [
self.get_weight(defender, defender_weights)
for defender in population_defender.individuals
]
weights /= np.sum(weights)
defender = np.random.choice(population_defender.individuals,
p=weights).genome
optimizer = torch.optim.Adam(attacker.net.parameters(),
lr=individual_attacker.learning_rate,
betas=(0.5, 0.999))
# Restore previous state dict, if available
if individual_attacker.optimizer_state is not None:
optimizer.load_state_dict(individual_attacker.optimizer_state)
loss = attacker.compute_loss_against(defender, input_var)[0]
attacker.net.zero_grad()
defender.net.zero_grad()
loss.backward()
optimizer.step()
individual_attacker.optimizer_state = optimizer.state_dict()
return input_var
@staticmethod
def evaluate_fitness(population_attacker, population_defender, input_var):
for individual_attacker in population_attacker.individuals:
for individual_defender in population_defender.individuals:
if individual_attacker.is_local:
fitness_attacker = float(
individual_attacker.genome.compute_loss_against(
individual_defender.genome, input_var)[0])
if fitness_attacker > individual_attacker.fitness:
individual_attacker.fitness = fitness_attacker
if individual_defender.is_local:
fitness_defender = float(
individual_defender.genome.compute_loss_against(
individual_attacker.genome, input_var)[0])
if fitness_defender > individual_defender.fitness:
individual_defender.fitness = fitness_defender
def mutate_mixture_weights(self, weights_attacker, weights_defender,
population_attacker, population_defender,
input_data):
# Not necessary for single-cell grids, as mixture must always be [1]
if self.neighbourhood.grid_size == 1:
return
# Mutate mixture weights
z = np.random.normal(loc=0,
scale=self.mixture_sigma,
size=len(weights_attacker))
transformed = np.asarray(
[value for _, value in weights_attacker.items()])
transformed += z
new_mixture_weights = {}
for i, key in enumerate(weights_attacker):
new_mixture_weights[key] = transformed[i]
for attacker in population_attacker.individuals:
loss_prev = self.weights_loss(attacker, population_defender,
weights_attacker, weights_defender,
input_data)
loss_new = self.weights_loss(attacker, population_defender,
new_mixture_weights, weights_defender,
input_data)
if loss_new < loss_prev:
weights_attacker[attacker.source] = self.get_weight(
attacker, new_mixture_weights)
# Don't allow negative values, normalize to sum of 1.0
clipped = np.clip(list(weights_attacker.values()), 0, None)
clipped /= np.sum(clipped)
for i, key in enumerate(weights_attacker):
weights_attacker[key] = clipped[i]
def calculate_score(self):
best_generators = self.neighbourhood.best_generators
dataset = MixedGeneratorDataset(
best_generators, self.neighbourhood.mixture_weights_generators,
self.score_sample_size)
self.score = self.score_calc.calculate(dataset)[0]
@staticmethod
def get_weight(individual, weights):
return [v for k, v in weights.items() if k == individual.source][0]
@staticmethod
def weights_loss(attacker, population_defender, weights_attacker,
weights_defender, input_data):
w_attacker = LipizzanerGANTrainer.get_weight(attacker,
weights_attacker)
return sum([
w_attacker *
LipizzanerGANTrainer.get_weight(defender, weights_defender) *
float(
attacker.genome.compute_loss_against(defender.genome,
input_data)[0])
for defender in population_defender.individuals
])