def call(self, inputs, genres):
"""
Executes the discriminator model on a batch of input images and outputs whether it is real or fake.
:param inputs: a batch of images, shape=[batch_size, height, width, channels]
:param genre: a genre string, shape=[1,]
:return: a batch of values indicating whether the image is real or fake, shape=[batch_size, 1]
"""
genres = tf.convert_to_tensor(genres)
# set up genre embedding
embed = self.embedding(genres)
embed = self.embed_reshape(self.embed_dense(embed))
# merge information
out = self.merge([embed, inputs])
# proceed with normal discriminator processes
out = self.conv1(out)
# out = self.activate(self.norm(self.conv2(out)))
out = self.conv2(out)
(mean, variance) = tf.nn.moments(out, (0, 1, 2))
out = batch_normalization(out,
mean,
variance,
offset=0,
scale=1,
variance_epsilon=0.00001)
self.activate(out)
# out = self.activate(self.norm(self.conv3(out)))
out = self.conv3(out)
(mean, variance) = tf.nn.moments(out, (0, 1, 2))
out = batch_normalization(out,
mean,
variance,
offset=0,
scale=1,
variance_epsilon=0.00001)
self.activate(out)
# out = self.activate(self.norm(self.conv4(out)))
out = self.conv4(out)
(mean, variance) = tf.nn.moments(out, (0, 1, 2))
out = batch_normalization(out,
mean,
variance,
offset=0,
scale=1,
variance_epsilon=0.00001)
self.activate(out)
flat = self.flat(out)
return self.decision(flat)
def call(self, inputs):
mean, variance = nn.moments(
inputs, self.moments_axes, keepdims=True)
outputs = nn.batch_normalization(
inputs, mean, variance, None, None, self.epsilon, name='LayerInstanceNorm')
return outputs
def call(self, inputs, gamma, beta):
mean, variance = nn.moments(
inputs, self.moments_axes, keepdims=True)
outputs = nn.batch_normalization(
inputs, mean, variance, gamma, beta, self.epsilon, name='AdaptiveInstanceNorm')
return outputs
def batch_norm_layer(x, is_train, decay=0.9, name_or_scope=None):
"""
x: [b, emb_dim]
"""
with tf.variable_scope(name_or_scope=name_or_scope,
default_name="batch_norm_layer"):
params_shape = [1, x.shape[-1]]
beta = tf.get_variable("beta",
params_shape,
tf.float32,
initializer=tf.constant_initializer(
0.0, tf.float32))
gamma = tf.get_variable("gamma",
params_shape,
tf.float32,
initializer=tf.constant_initializer(
1.0, tf.float32))
if is_train:
mean, variance = tfnn.moments(x, axes=[0], keep_dims=True)
moving_mean = tf.get_variable('moving_mean',
shape=params_shape,
dtype=tf.float32,
initializer=tf.constant_initializer(
0.0, tf.float32),
trainable=False)
moving_variance = tf.get_variable(
'moving_variance',
shape=params_shape,
dtype=tf.float32,
initializer=tf.constant_initializer(1.0, tf.float32),
trainable=False)
tf.add_to_collection(
tf.GraphKeys.TRAIN_OP,
tf.assign(moving_mean,
decay * moving_mean + (1 - decay) * mean))
tf.add_to_collection(
tf.GraphKeys.TRAIN_OP,
tf.assign(moving_variance,
decay * moving_variance + (1 - decay) * variance))
else:
mean = tf.get_variable('moving_mean',
shape=params_shape,
dtype=tf.float32,
initializer=tf.constant_initializer(
0.0, tf.float32),
trainable=False)
variance = tf.get_variable('moving_variance',
shape=params_shape,
dtype=tf.float32,
initializer=tf.constant_initializer(
1.0, tf.float32),
trainable=False)
x = tfnn.batch_normalization(x, mean, variance, beta, gamma, 1e-6)
return x
def resnetBlock(X, weights1, bias1, weights2, bias2, mean1, variance1, offset1,
scale1, mean2, variance2, offset2, scale2):
conv1 = nn.conv2d(X,
weights1,
strides=[1, 1, 1, 1],
padding="VALID",
data_format="NCHW")
conv1_bias = nn.bias_add(conv1, bias1, data_format="NCHW")
bn1 = nn.batch_normalization(conv1_bias, mean1, variance1, offset1, scale1,
EPSILON)
relu1 = nn.relu(bn1)
conv2 = nn.conv2d(relu1,
weights2,
strides=[1, 1, 1, 1],
padding="SAME",
data_format="NCHW")
conv2_bias = nn.bias_add(conv2, bias2, data_format="NCHW")
bn2 = nn.batch_normalization(conv2_bias, mean2, variance2, offset2, scale2,
EPSILON)
return bn2
def trans_conv_layer(previous_layer, filters, kernel_size=(3,3),stride=2,padding='SAME',relu=True, norm='instance'):
batch,height,width,channels = previous_layer.get_shape().as_list()
shape = [kernel_size[0], kernel_size[1], filters, channels]
new_shape = tf.convert_to_tensor([batch,(height*stride),(width*stride),filters])
conv = conv2d_transpose(previous_layer, create_weights(shape),new_shape,[1,stride,stride,1],padding=padding)
if norm == 'instance':
normalised = tf.contrib.layers.instance_norm(conv)
else:
mean,variance = tf.nn.moments(conv,[0,1,2])
normalised = batch_normalization(conv,mean,variance,None,None,0.0001)
if relu:
relu_layer = tf.nn.relu(normalised)
return relu_layer
return normalised
def conv_layer(previous_layer, filters, kernel_size=(3,3),stride=2,relu=True,padding='SAME', norm='instance'):
#Get the output channel size from previous layer
channels = previous_layer.get_shape().as_list()[3]
#The shape of the output tensor for this convolutional layer
shape = [kernel_size[0], kernel_size[1],channels, filters]
#Create convolution layer
conv = conv2d(previous_layer, create_weights(shape), [1,stride,stride,1],padding=padding)
#If using instance norm..
if norm == 'instance':
normalised = tf.contrib.layers.instance_norm(conv)
#Otherwise, we use batch norm..
else:
mean,variance = tf.nn.moments(conv,[0,1,2])
normalised = batch_normalization(conv,mean,variance,None,None,0.0001)
#If we use ReLU, add ReLU layer.
if relu:
relu_layer = tf.nn.relu(normalised)
return relu_layer
return normalised
def call(self, inputs):
# Compute the axes along which to reduce the mean / variance
input_shape = inputs.shape
ndims = len(input_shape)
# Broadcasting only necessary for norm where the axis is not just
# the last dimension
broadcast_shape = [1] * ndims
for dim in self.axis:
broadcast_shape[dim] = input_shape.dims[dim].value
def _broadcast(v):
if (v is not None and len(v.shape) != ndims
and self.axis != [ndims - 1]):
return array_ops.reshape(v, broadcast_shape)
return v
if not self._fused:
input_dtype = inputs.dtype
if input_dtype in ('float16',
'bfloat16') and self.dtype == 'float32':
# If mixed precision is used, cast inputs to float32 so that this is at
# least as numerically stable as the fused version.
inputs = math_ops.cast(inputs, 'float32')
# Calculate the moments on the last axis (layer activations).
mean, variance = nn.moments(inputs, self.axis, keep_dims=True)
scale, offset = _broadcast(self.gamma), _broadcast(self.beta)
# Compute layer normalization using the batch_normalization function.
outputs = nn.batch_normalization(inputs,
mean,
variance,
offset=offset,
scale=scale,
variance_epsilon=self.epsilon)
outputs = tf.cast(outputs, input_dtype)
else:
# Collapse dims before self.axis, and dims in self.axis
pre_dim, in_dim = (1, 1)
axis = sorted(self.axis)
tensor_shape = array_ops.shape(inputs)
for dim in range(0, ndims):
dim_tensor = tensor_shape[dim]
if dim < axis[0]:
pre_dim = pre_dim * dim_tensor
else:
assert dim in axis
in_dim = in_dim * dim_tensor
squeezed_shape = [1, pre_dim, in_dim, 1]
# This fused operation requires reshaped inputs to be NCHW.
data_format = 'NCHW'
inputs = array_ops.reshape(inputs, squeezed_shape)
def _set_const_tensor(val, dtype, shape):
return array_ops.fill(shape,
constant_op.constant(val, dtype=dtype))
# self.gamma and self.beta have the wrong shape for fused_batch_norm, so
# we cannot pass them as the scale and offset parameters. Therefore, we
# create two constant tensors in correct shapes for fused_batch_norm and
# later construct a separate calculation on the scale and offset.
scale = _set_const_tensor(1.0, self.dtype, [pre_dim])
offset = _set_const_tensor(0.0, self.dtype, [pre_dim])
# Compute layer normalization using the fused_batch_norm function.
outputs, _, _ = nn.fused_batch_norm(inputs,
scale=scale,
offset=offset,
epsilon=self.epsilon,
data_format=data_format)
outputs = array_ops.reshape(outputs, tensor_shape)
scale, offset = _broadcast(self.gamma), _broadcast(self.beta)
if scale is not None:
outputs = outputs * math_ops.cast(scale, outputs.dtype)
if offset is not None:
outputs = outputs + math_ops.cast(offset, outputs.dtype)
# If some components of the shape got lost due to adjustments, fix that.
outputs.set_shape(input_shape)
return outputs