def test_patchgan(self, create_gan_model_fn):
"""Ensure that patch-based discriminators work end-to-end."""
if tf.executing_eagerly():
# None of the usual utilities work in eager.
return
tf.compat.v1.random.set_random_seed(1234)
model = create_gan_model_fn()
loss = tfgan.gan_loss(model)
g_opt = tf.compat.v1.train.GradientDescentOptimizer(1.0)
d_opt = tf.compat.v1.train.GradientDescentOptimizer(1.0)
train_ops = tfgan.gan_train_ops(model, loss, g_opt, d_opt)
final_step = tfgan.gan_train(
train_ops, logdir='', hooks=[tf.estimator.StopAtStepHook(num_steps=2)])
self.assertTrue(np.isscalar(final_step))
self.assertEqual(2, final_step)
def test_get_sync_estimator_spec(self):
"""Make sure spec is loaded with sync hooks for sync opts."""
with tf.Graph().as_default():
gan_model = get_dummy_gan_model()
gan_loss = tfgan.gan_loss(gan_model, dummy_loss_fn, dummy_loss_fn)
g_opt = get_sync_optimizer()
d_opt = get_sync_optimizer()
spec = get_train_estimator_spec(gan_model,
gan_loss,
Optimizers(g_opt, d_opt),
get_hooks_fn=None) # use default.
self.assertLen(spec.training_hooks, 4)
sync_opts = [
hook._sync_optimizer for hook in spec.training_hooks
if isinstance(hook, get_sync_optimizer_hook_type())
]
self.assertLen(sync_opts, 2)
self.assertSetEqual(frozenset(sync_opts), frozenset(
(g_opt, d_opt)))
def test_output_type(self, create_gan_model_fn):
if tf.executing_eagerly():
# None of the usual utilities work in eager.
return
model = create_gan_model_fn()
loss = tfgan.gan_loss(model)
g_opt = tf.compat.v1.train.GradientDescentOptimizer(1.0)
d_opt = tf.compat.v1.train.GradientDescentOptimizer(1.0)
train_ops = tfgan.gan_train_ops(
model,
loss,
g_opt,
d_opt,
summarize_gradients=True,
colocate_gradients_with_ops=True)
self.assertIsInstance(train_ops, tfgan.GANTrainOps)
# Make sure there are no training hooks populated accidentally.
self.assertEmpty(train_ops.train_hooks)
def define_loss(gan_model, **kwargs):
"""Defines progressive GAN losses.
The generator and discriminator both use wasserstein loss. In addition,
a small penalty term is added to the discriminator loss to prevent it getting
too large.
Args:
gan_model: A `GANModel` namedtuple.
**kwargs: A dictionary of
'gradient_penalty_weight': A float of gradient norm target for
wasserstein loss.
'gradient_penalty_target': A float of gradient penalty weight for
wasserstein loss.
'real_score_penalty_weight': A float of Additional penalty to keep the
scores from drifting too far from zero.
Returns:
A `GANLoss` namedtuple.
"""
gan_loss = tfgan.gan_loss(
gan_model,
generator_loss_fn=tfgan.losses.wasserstein_generator_loss,
discriminator_loss_fn=tfgan.losses.wasserstein_discriminator_loss,
gradient_penalty_weight=kwargs['gradient_penalty_weight'],
gradient_penalty_target=kwargs['gradient_penalty_target'],
gradient_penalty_epsilon=0.0)
real_score_penalty = tf.reduce_mean(
input_tensor=tf.square(gan_model.discriminator_real_outputs))
tf.compat.v1.summary.scalar('real_score_penalty', real_score_penalty)
return gan_loss._replace(
discriminator_loss=(
gan_loss.discriminator_loss +
kwargs['real_score_penalty_weight'] * real_score_penalty))
def test_train_hooks_exist_in_get_hooks_fn(self, create_gan_model_fn):
if tf.executing_eagerly():
# None of the usual utilities work in eager.
return
model = create_gan_model_fn()
loss = tfgan.gan_loss(model)
g_opt = get_sync_optimizer()
d_opt = get_sync_optimizer()
train_ops = tfgan.gan_train_ops(
model,
loss,
g_opt,
d_opt,
summarize_gradients=True,
colocate_gradients_with_ops=True)
sequential_train_hooks = tfgan.get_sequential_train_hooks()(train_ops)
self.assertLen(sequential_train_hooks, 4)
sync_opts = [
hook._sync_optimizer
for hook in sequential_train_hooks
if isinstance(hook, get_sync_optimizer_hook_type())
]
self.assertLen(sync_opts, 2)
self.assertSetEqual(frozenset(sync_opts), frozenset((g_opt, d_opt)))
joint_train_hooks = tfgan.get_joint_train_hooks()(train_ops)
self.assertLen(joint_train_hooks, 5)
sync_opts = [
hook._sync_optimizer
for hook in joint_train_hooks
if isinstance(hook, get_sync_optimizer_hook_type())
]
self.assertLen(sync_opts, 2)
self.assertSetEqual(frozenset(sync_opts), frozenset((g_opt, d_opt)))
def train(hparams):
"""Trains an MNIST GAN.
Args:
hparams: An HParams instance containing the hyperparameters for training.
"""
if not tf.io.gfile.exists(hparams.train_log_dir):
tf.io.gfile.makedirs(hparams.train_log_dir)
# Force all input processing onto CPU in order to reserve the GPU for
# the forward inference and back-propagation.
with tf.name_scope('inputs'), tf.device('/cpu:0'):
images, one_hot_labels = data_provider.provide_data(
'train', hparams.batch_size, num_parallel_calls=4)
# Define the GANModel tuple. Optionally, condition the GAN on the label or
# use an InfoGAN to learn a latent representation.
if hparams.gan_type == 'unconditional':
gan_model = tfgan.gan_model(
generator_fn=networks.unconditional_generator,
discriminator_fn=networks.unconditional_discriminator,
real_data=images,
generator_inputs=tf.random.normal(
[hparams.batch_size, hparams.noise_dims]))
elif hparams.gan_type == 'conditional':
noise = tf.random.normal([hparams.batch_size, hparams.noise_dims])
gan_model = tfgan.gan_model(
generator_fn=networks.conditional_generator,
discriminator_fn=networks.conditional_discriminator,
real_data=images,
generator_inputs=(noise, one_hot_labels))
elif hparams.gan_type == 'infogan':
cat_dim, cont_dim = 10, 2
generator_fn = functools.partial(networks.infogan_generator,
categorical_dim=cat_dim)
discriminator_fn = functools.partial(networks.infogan_discriminator,
categorical_dim=cat_dim,
continuous_dim=cont_dim)
unstructured_inputs, structured_inputs = util.get_infogan_noise(
hparams.batch_size, cat_dim, cont_dim, hparams.noise_dims)
gan_model = tfgan.infogan_model(
generator_fn=generator_fn,
discriminator_fn=discriminator_fn,
real_data=images,
unstructured_generator_inputs=unstructured_inputs,
structured_generator_inputs=structured_inputs)
tfgan.eval.add_gan_model_image_summaries(gan_model, hparams.grid_size)
# Get the GANLoss tuple. You can pass a custom function, use one of the
# already-implemented losses from the losses library, or use the defaults.
with tf.name_scope('loss'):
if hparams.gan_type == 'infogan':
gan_loss = tfgan.gan_loss(
gan_model,
generator_loss_fn=tfgan.losses.modified_generator_loss,
discriminator_loss_fn=tfgan.losses.modified_discriminator_loss,
mutual_information_penalty_weight=1.0,
add_summaries=True)
else:
gan_loss = tfgan.gan_loss(gan_model, add_summaries=True)
tfgan.eval.add_regularization_loss_summaries(gan_model)
# Get the GANTrain ops using custom optimizers.
with tf.name_scope('train'):
gen_lr, dis_lr = _learning_rate(hparams.gan_type)
train_ops = tfgan.gan_train_ops(
gan_model,
gan_loss,
generator_optimizer=tf.train.AdamOptimizer(gen_lr, 0.5),
discriminator_optimizer=tf.train.AdamOptimizer(dis_lr, 0.5),
summarize_gradients=True,
aggregation_method=tf.AggregationMethod.EXPERIMENTAL_ACCUMULATE_N)
# Run the alternating training loop. Skip it if no steps should be taken
# (used for graph construction tests).
status_message = tf.strings.join([
'Starting train step: ',
tf.as_string(tf.train.get_or_create_global_step())
],
name='status_message')
if hparams.max_number_of_steps == 0:
return
tfgan.gan_train(
train_ops,
hooks=[
tf.estimator.StopAtStepHook(num_steps=hparams.max_number_of_steps),
tf.estimator.LoggingTensorHook([status_message], every_n_iter=10)
],
logdir=hparams.train_log_dir,
get_hooks_fn=tfgan.get_joint_train_hooks(),
save_checkpoint_secs=60)
def test_mutual_info_penalty(self, create_gan_model_fn):
"""Test mutual information penalty option."""
tfgan.gan_loss(
create_gan_model_fn(),
mutual_information_penalty_weight=tf.constant(1.0))
def test_args_passed_in_correctly(self):
def loss_fn(gan_model, add_summaries):
del gan_model
self.assertFalse(add_summaries)
return 0
tfgan.gan_loss(get_gan_model(), loss_fn, loss_fn, add_summaries=False)
def test_no_reduction_or_add_summaries_loss(self):
def loss_fn(_):
return 0
tfgan.gan_loss(get_gan_model(), loss_fn, loss_fn)
def test_sync_replicas(self, create_gan_model_fn, create_global_step):
if tf.executing_eagerly():
# None of the usual utilities work in eager.
return
model = create_gan_model_fn()
loss = tfgan.gan_loss(model)
num_trainable_vars = len(get_trainable_variables())
if create_global_step:
gstep = tf.compat.v1.get_variable(
'custom_gstep',
dtype=tf.int32,
initializer=0,
trainable=False)
tf.compat.v1.add_to_collection(tf.compat.v1.GraphKeys.GLOBAL_STEP, gstep)
g_opt = get_sync_optimizer()
d_opt = get_sync_optimizer()
train_ops = tfgan.gan_train_ops(
model, loss, generator_optimizer=g_opt, discriminator_optimizer=d_opt)
self.assertIsInstance(train_ops, tfgan.GANTrainOps)
# No new trainable variables should have been added.
self.assertLen(get_trainable_variables(), num_trainable_vars)
# Sync hooks should be populated in the GANTraintf.
self.assertLen(train_ops.train_hooks, 2)
for hook in train_ops.train_hooks:
self.assertIsInstance(hook, get_sync_optimizer_hook_type())
sync_opts = [hook._sync_optimizer for hook in train_ops.train_hooks]
self.assertSetEqual(frozenset(sync_opts), frozenset((g_opt, d_opt)))
g_sync_init_op = g_opt.get_init_tokens_op(num_tokens=1)
d_sync_init_op = d_opt.get_init_tokens_op(num_tokens=1)
# Check that update op is run properly.
global_step = tf.compat.v1.train.get_or_create_global_step()
with self.cached_session() as sess:
sess.run(tf.compat.v1.global_variables_initializer())
sess.run(tf.compat.v1.local_variables_initializer())
sess.run(g_opt.chief_init_op)
sess.run(d_opt.chief_init_op)
gstep_before = sess.run(global_step)
# Start required queue runner for SyncReplicasOptimizer.
coord = tf.train.Coordinator()
g_threads = g_opt.get_chief_queue_runner().create_threads(sess, coord)
d_threads = d_opt.get_chief_queue_runner().create_threads(sess, coord)
sess.run(g_sync_init_op)
sess.run(d_sync_init_op)
sess.run(train_ops.generator_train_op)
# Check that global step wasn't incremented.
self.assertEqual(gstep_before, sess.run(global_step))
sess.run(train_ops.discriminator_train_op)
# Check that global step wasn't incremented.
self.assertEqual(gstep_before, sess.run(global_step))
coord.request_stop()
coord.join(g_threads + d_threads)
def train(hparams):
"""Trains a CIFAR10 GAN.
Args:
hparams: An HParams instance containing the hyperparameters for training.
"""
if not tf.io.gfile.exists(hparams.train_log_dir):
tf.io.gfile.makedirs(hparams.train_log_dir)
with tf.device(
tf.compat.v1.train.replica_device_setter(hparams.ps_replicas)):
# Force all input processing onto CPU in order to reserve the GPU for
# the forward inference and back-propagation.
with tf.compat.v1.name_scope('inputs'):
with tf.device('/cpu:0'):
images, _ = data_provider.provide_data('train',
hparams.batch_size,
num_parallel_calls=4)
# Define the GANModel tuple.
generator_fn = networks.generator
discriminator_fn = networks.discriminator
generator_inputs = tf.random.normal([hparams.batch_size, 64])
gan_model = tfgan.gan_model(generator_fn,
discriminator_fn,
real_data=images,
generator_inputs=generator_inputs)
tfgan.eval.add_gan_model_image_summaries(gan_model)
# Get the GANLoss tuple. Use the selected GAN loss functions.
with tf.compat.v1.name_scope('loss'):
gan_loss = tfgan.gan_loss(gan_model,
gradient_penalty_weight=1.0,
add_summaries=True)
# Get the GANTrain ops using the custom optimizers and optional
# discriminator weight clipping.
with tf.compat.v1.name_scope('train'):
gen_opt, dis_opt = _get_optimizers(hparams)
train_ops = tfgan.gan_train_ops(gan_model,
gan_loss,
generator_optimizer=gen_opt,
discriminator_optimizer=dis_opt,
summarize_gradients=True)
# Run the alternating training loop. Skip it if no steps should be taken
# (used for graph construction tests).
status_message = tf.strings.join([
'Starting train step: ',
tf.as_string(tf.compat.v1.train.get_or_create_global_step())
],
name='status_message')
if hparams.max_number_of_steps == 0:
return
tfgan.gan_train(train_ops,
hooks=([
tf.estimator.StopAtStepHook(
num_steps=hparams.max_number_of_steps),
tf.estimator.LoggingTensorHook([status_message],
every_n_iter=10)
]),
logdir=hparams.train_log_dir,
master=hparams.master,
is_chief=hparams.task == 0)
