def inference(self, input_):
conv1 = layers.conv2d_same(input_, self.num_kernel, name='conv1')
res_block1 = self.res_block(conv1,
self.num_kernel * 2,
is_downsizing=False,
name='res_block1')
res_block2 = self.res_block(res_block1,
self.num_kernel * 4,
is_downsizing=True,
name='res_block2')
res_block3 = self.res_block(res_block2,
self.num_kernel * 8,
is_downsizing=True,
name='res_block3')
act = self.res_act(res_block3)
pool = layers.avg_pool(act,
k_h=self.pool_kernel,
k_w=self.pool_kernel,
d_h=1,
d_w=1,
name='pool')
flat = layers.flatten(pool, 'flat')
linear = layers.linear(flat, self.num_class, name='linear')
return linear
def latent(x, latent_size, reuse=False):
"""Add latant nodes to the graph.
Args:
x: Tensor, output from encoder.
latent_size: Integer, size of latent vector.
reuse: Boolean, whether to reuse variables.
"""
with arg_scope([dense], reuse = reuse):
x = flatten(x)
x = dense(x, 32*4*4, latent_size, name='d1')
return x
def latent(x, batch_size, latent_size, reuse=False):
"""Adds latent nodes for sampling and reparamaterization.
Args:
x: Tensor, input images.
batch_size: Integer, batch size.
latent_size: Integer, size of latent vector.
reuse: Boolean, whether to reuse variables.
"""
with arg_scope([dense], reuse=reuse):
flat = flatten(x)
z_mean = dense(flat, 32 * 4 * 4, latent_size, name='d1')
z_stddev = dense(flat, 32 * 4 * 4, latent_size, name='d2')
samples = tf.random_normal([batch_size, latent_size], 0, 1)
z = (z_mean + (z_stddev * samples))
return (samples, z, z_mean, z_stddev)
def inference(self, input_):
conv1 = layers.conv2d_same_repeat(input_,
self.kernel_num,
num_repeat=2,
name="down1")
pool1 = layers.max_pool(conv1, name="pool1")
conv2 = layers.conv2d_same_repeat(pool1,
self.kernel_num * 2,
num_repeat=2,
name="down2")
pool2 = layers.max_pool(conv2, name="pool2")
conv3 = layers.conv2d_same_repeat(pool2,
self.kernel_num * 4,
num_repeat=3,
name="down3")
pool3 = layers.max_pool(conv3, name="pool3")
conv4 = layers.conv2d_same_repeat(pool3,
self.kernel_num * 8,
num_repeat=3,
name="down4")
pool4 = layers.max_pool(conv4, name="pool4")
conv5 = layers.conv2d_same_repeat(pool4,
self.kernel_num * 8,
num_repeat=3,
name="down5")
pool5 = layers.max_pool(conv5, name="pool5")
flat = layers.flatten(pool5, 'flat')
linear = layers.linear(flat,
flat.get_shape().as_list()[-1],
name='linear')
logits = layers.linear(linear, self.num_class, name='logits')
return logits
def inference(self, input_, reuse=False):
with tf.variable_scope('ResNet') as scope:
if reuse:
scope.reuse_variables()
conv1 = layers.conv2d_same_act(input_, self.num_kernel, k_h=7, k_w=7, d_h=2, d_w=2,
activation_fn=self.act_fn, name='conv_1')
pool1 = layers.max_pool(conv1, k_h=self.pool_kernel, k_w=self.pool_kernel,
padding='SAME', name='pool1')
layer_blocks = self.layer_repeat(pool1, self.layer_def, name='layers')
pool2 = layers.global_avg_pool(layer_blocks, name='pool2')
flat = layers.flatten(pool2, 'flat')
linear = layers.linear(flat, self.num_class, name='linear')
logit = tf.sigmoid(linear, name='logit')
return logit
def inference(self, input_):
conv1 = layers.conv2d_same_repeat(input_, self.kernel_num, num_repeat=2, activation_fn=self.act_fn, name="down1")
pool1 = layers.max_pool(conv1, name="pool1")
conv2 = layers.conv2d_same_repeat(pool1, self.kernel_num * 2, num_repeat=2, activation_fn=self.act_fn, name="down2")
pool2 = layers.max_pool(conv2, name="pool2")
conv3 = layers.conv2d_same_repeat(pool2, self.kernel_num * 4, num_repeat=3, activation_fn=self.act_fn, name="down3")
pool3 = layers.max_pool(conv3, name="pool3")
conv4 = layers.conv2d_same_repeat(pool3, self.kernel_num * 8, num_repeat=3, activation_fn=self.act_fn, name="down4")
pool4 = layers.max_pool(conv4, name="pool4")
conv5 = layers.conv2d_same_repeat(pool4, self.kernel_num * 8, num_repeat=3, activation_fn=self.act_fn, name="down5")
pool5 = layers.global_avg_pool(conv5, name="pool5")
conv6 = layers.bottleneck_act(pool5, self.kernel_num * 8, activation_fn=self.act_fn, name="down6")
conv7 = layers.bottleneck_layer(conv6, self.num_class, name="down7")
logits = layers.flatten(conv7, 'flat')
return logits
def encode(self, x, reuse=False, is_training=True):
with tf.variable_scope(self.name):
with tf.variable_scope('Encoder') as vs:
if reuse:
vs.reuse_variables()
for i in range(3):
filters = self.first_filters * (2**i)
x = conv_block(x,
filters=filters,
sampling='same',
is_training=is_training,
**self.conv_block_params)
x = conv_block(x,
filters=filters,
sampling='down',
is_training=is_training,
**self.conv_block_params)
self.feature_shape = x.get_shape().as_list()[1:]
x = flatten(x)
x = dense(x, 128, activation_='lrelu')
x = dense(x, self.latent_dim)
return x
def pixel_wise_cross_entropy(input_, target_, lamb=1.0, name="pixel_ce"):
flat = layers.flatten(input_)
return cross_entropy_loss(flat, target_, lamb, name)
def gan(x, args):
"""Initialize model.
Args:
x: Tensor, the real images.
args: Argparse structure.
"""
g_opt, d_opt = init_optimizer(args), init_optimizer(args)
g_tower_grads, d_tower_grads = [], []
x = flatten(x)
x = 2 * (x - 0.5)
# rescale [0,1] to [-1,1] depending on model
# if args.model in ['wgan', 'iwgan']:
# x = 2 * (x - 0.5)
for x, scope, gpu_id in tower_scope_range(x, args.n_gpus, args.batch_size):
# model
with tf.variable_scope('generator'):
g = generator(args.batch_size,
args.latent_size,
args,
reuse=(gpu_id > 0))
with tf.variable_scope('discriminator'):
d_real = discriminator(x, args, reuse=(gpu_id > 0))
d_fake = discriminator(g, args, reuse=True)
# losses
g_loss, d_loss = losses(x, g, d_fake, d_real, args)
# compute gradients
g_params = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES,
'generator')
d_params = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES,
'discriminator')
g_tower_grads.append(g_opt.compute_gradients(g_loss,
var_list=g_params))
d_tower_grads.append(d_opt.compute_gradients(d_loss,
var_list=d_params))
# only need one batchnorm update (ends up being updates for last tower)
batchnorm_updates = tf.get_collection(tf.GraphKeys.UPDATE_OPS, scope)
# summaries
summaries(g, x, args)
# average and apply gradients
g_grads = average_gradients(g_tower_grads)
d_grads = average_gradients(d_tower_grads)
summarize_gradients(g_grads + d_grads)
global_step = tf.train.get_global_step()
g_apply_grads = g_opt.apply_gradients(g_grads, global_step=global_step)
d_apply_grads = d_opt.apply_gradients(d_grads, global_step=global_step)
# training
if args.model == 'gan':
train_func = _train_gan(g_apply_grads, d_apply_grads,
batchnorm_updates)
elif args.model == 'wgan':
train_func = _train_wgan(g_apply_grads, g_params, d_apply_grads,
d_params, batchnorm_updates)
elif args.model == 'iwgan':
train_func = _train_iwgan(g_apply_grads, d_apply_grads,
batchnorm_updates)
return train_func
def _inference(self, input_):
conv1 = layers.conv2d_same_act(input_,
16,
activation_fn=self.activation_fn,
name='conv1')
skip1 = layers.bottleneck_layer(conv1, 32, name='skip1')
_, conv2 = layers.conv2d_same_repeat(conv1,
32,
num_repeat=2,
activation_fn=self.activation_fn,
with_logit=True,
name='conv2')
res1 = tf.add(skip1, conv2, name='res1')
res_act1 = self.res_act(res1)
_, conv3 = layers.conv2d_same_repeat(res_act1,
32,
num_repeat=2,
activation_fn=self.activation_fn,
with_logit=True,
name='conv3')
res2 = tf.add(conv3, res1, name='res2')
res_act2 = self.res_act(res2)
skip2 = layers.bottleneck_layer(res_act2,
64,
d_h=2,
d_w=2,
name='skip2')
conv4 = layers.conv2d_same_act(res_act2,
64,
d_h=2,
d_w=2,
activation_fn=self.activation_fn,
name='conv4')
conv5 = layers.conv2d_same(conv4, 64, name='conv5')
res3 = tf.add(skip2, conv5, name='res3')
res_act3 = self.res_act(res3)
_, conv6 = layers.conv2d_same_repeat(res_act1,
64,
num_repeat=2,
activation_fn=self.activation_fn,
with_logit=True,
name='conv3')
res4 = tf.add(res3, conv6, name='res4')
res_act4 = self.res_act(res4)
skip3 = layers.bottleneck_layer(res_act4,
128,
d_h=2,
d_w=2,
name='skip3')
conv7 = layers.conv2d_same_act(res_act4,
128,
d_h=2,
d_w=2,
activation_fn=self.activation_fn,
name='conv7')
conv8 = layers.conv2d_same(conv7, 128, name='conv8')
res5 = tf.add(skip3, conv8, name='res5')
res_act5 = self.res_act(res5)
_, conv9 = layers.conv2d_same_repeat(res_act5,
128,
num_repeat=2,
activation_fn=self.activation_fn,
with_logit=True,
name='conv9')
res6 = tf.add(res5, conv9, name='res6')
res_act6 = self.res_act(res6)
pool = layers.avg_pool(res_act6,
k_h=8,
k_w=8,
d_h=1,
d_w=1,
name='pool')
flat = layers.flatten(pool, 'flat')
linear = layers.linear(flat, self.num_class, name='linear')
return linear