def layer_norm(x: tf.Tensor, epsilon: float = 1e-6) -> tf.Tensor:
"""Layer normalize the tensor x, averaging over the last dimension.
Implementation based on tensor2tensor.
Arguments:
x: The ``Tensor`` to normalize.
epsilon: The smoothing parameter of the normalization.
Returns:
The normalized tensor.
"""
with tf.variable_scope("LayerNorm"):
gamma = get_variable(
name="gamma",
shape=[x.get_shape()[-1]],
dtype=tf.float32,
initializer=tf.ones_initializer())
beta = get_variable(
name="beta",
shape=[x.get_shape()[-1]],
dtype=tf.float32,
initializer=tf.zeros_initializer())
mean = tf.reduce_mean(x, axis=[-1], keepdims=True)
variance = tf.reduce_mean(
tf.square(x - mean),
axis=[-1],
keepdims=True)
norm_x = (x - mean) * tf.rsqrt(variance + epsilon)
return norm_x * gamma + beta
def get_shape_list(x: tf.Tensor) -> List[Union[int, tf.Tensor]]:
"""Return list of dims, statically where possible.
Compute the static shape of a tensor. Where the dimension is not static
(e.g. batch or time dimension), symbolic Tensor is returned.
Based on tensor2tensor.
Arguments:
x: The ``Tensor`` to process.
Returns:
A list of integers and Tensors.
"""
x = tf.convert_to_tensor(x)
# If unknown rank, return dynamic shape
if x.get_shape().dims is None:
return tf.shape(x)
static = x.get_shape().as_list()
shape = tf.shape(x)
ret = []
for i, dim in enumerate(static):
if dim is None:
dim = shape[i]
ret.append(dim)
return ret
def assert_shape(tensor: tf.Tensor,
expected_shape: List[Optional[int]]) -> None:
"""Check shape of a tensor.
Args:
tensor: Tensor to be chcecked.
expected_shape: Expected shape where `None` means the same as in TF and
`-1` means not checking the dimension.
"""
shape_list = tensor.get_shape().as_list()
if len(shape_list) != len(expected_shape):
raise CheckingException(
"Tensor '{}' with shape {} should have {} dimensions.".format(
tensor.name, shape_list, len(expected_shape)))
mismatching_dims = []
for i, (real, expected) in enumerate(zip(shape_list, expected_shape)):
if expected not in (real, -1):
mismatching_dims.append(i)
if mismatching_dims:
expected_str = ", ".join(
"?" if x == -1 else str(x) for x in expected_shape)
raise CheckingException(
("Shape mismatch of {} in dimensions: {}. "
"Shape was {}, but should be [{}]").format(
tensor.name,
", ".join(str(d) for d in mismatching_dims),
shape_list, expected_str))
def multilinear_grad(emb: tf.Tensor, tuples: tf.Tensor, score=False) -> tf.Tensor:
tuple_shape = [d.value for d in tuples.get_shape()]
# if len(tuple_shape) > 2:
# n = np.prod(tuple_shape[:-1])
# tuples = tf.reshape(tuples, (n, -1))
# n = tuples.get_shape()[0].value
order = tuples.get_shape()[2].value
rank = emb.get_shape()[-1].value
if order == 2:
if score:
emb_sel = tf.gather(emb, tuples)
grad_score = tf.reshape(tf.reverse(emb_sel, [False, False, True, False]), tuple_shape[:-1] + [2, rank])
prod = tf.reduce_prod(emb_sel, 2)
preds = tf.reshape(tf.reduce_sum(prod, 2), tuple_shape[:-1])
return grad_score, preds
raise NotImplementedError('Todo')
def split_by_factor(
tensor_3d: tf.Tensor, batch_size: tf.Tensor, factor: int) -> tf.Tensor:
max_time = tf.shape(tensor_3d)[1]
state_dim = tensor_3d.get_shape()[2].value
if state_dim % factor != 0:
raise ValueError((
"Dimension of the tensor ({}) must be dividable by the given "
"factor ({}).").format(state_dim, factor))
return tf.reshape(
tensor_3d, [batch_size, max_time * factor, state_dim // factor])
def build_cnn(input: tf.Tensor, n_grams, n_features) -> tf.Tensor:
max_seq_len = int(input.get_shape()[1])
word_d = int(input.get_shape()[2])
tran_input = tf.reshape(input, [-1, 1, max_seq_len, word_d])
results = list()
for n_gram, n_feature in zip(n_grams, n_features):
with tf.name_scope("conv-maxpool-%s" % n_gram):
filter = tf.to_float(
tf.Variable(tf.random_uniform([1, n_gram, word_d, n_feature], 0.05, 0.05, dtype=tf.float32)))
f_result = tf.nn.conv2d(tran_input, filter, strides=[1, 1, 1, 1], padding='VALID')
# batch_size * (valid_height)(1) * valid_length * n_feature
b = tf.Variable(tf.constant(0.1, shape=[n_feature]), name="b")
f_result = tf.nn.relu(tf.nn.bias_add(f_result, b))
p_result = tf.reshape(
tf.nn.max_pool(f_result, ksize=[1, 1, max_seq_len - n_gram + 1, 1], strides=[1, 1, 1, 1],
padding='VALID'), [-1, n_feature])
results.append(p_result)
return tf.concat(concat_dim=1, values=results)
def __input(self, node_input, tensor: tf.Tensor):
if type(node_input) == list:
concatenated_input = np.concatenate(
[self.nodes[node_input_].output
for node_input_ in node_input])
expanded_input = np.lib.pad(
concatenated_input,
(0, tensor.get_shape()[-1].value -
concatenated_input.shape[0]),
'constant')
return expanded_input
else:
return self.nodes[node_input].output
def assert_same_shape(tensor_a: tf.Tensor, tensor_b: tf.Tensor) -> None:
"""Check if two tensors have the same shape."""
shape_a = tensor_a.get_shape().as_list()
shape_b = tensor_b.get_shape().as_list()
if len(shape_a) != len(shape_b):
raise CheckingException(
("Tensor '{}' has {} dimensions and tensor '{}' has {} "
"dimension, but should have the same shape.").format(
tensor_a.name, len(shape_a), tensor_b.name, len(shape_b)))
mismatching_dims = []
for i, (size_a, size_b) in enumerate(zip(shape_a, shape_b)):
if size_a != size_b:
mismatching_dims.append(i)
if mismatching_dims:
raise CheckingException(
("Shape mismatch of '{}' and '{}' in dimensions: {}. "
"Shapes were {} and {}").format(
tensor_a.name, tensor_b.name,
", ".join(str(d) for d in mismatching_dims),
shape_a, shape_b))
def get_energies(self, y: tf.Tensor, weights_in_time: tf.Tensor):
weight_sum = tf.cond(
tf.greater(weights_in_time.size(), 0),
lambda: tf.reduce_sum(weights_in_time, axis=0),
lambda: 0.0)
coverage = weight_sum / self.fertility * self.attention_mask
coverage_exp = tf.expand_dims(tf.expand_dims(coverage, -1), -1)
logits = tf.reduce_sum(
self.similarity_bias_vector * tf.tanh(
self.hidden_features + y
+ self.coverage_weights * coverage_exp),
[2, 3])
return logits
def multi_conv2d_modified(inputs, filters: tf.Tensor, bias=None,
stride=list([1, 1, 1, 1]), padding='SAME', basis_rate=list([1, 3, 5]),
to_batch_norm=False, batch_norm_decay=0.997, is_training=True, activation_fn=None):
_number_of_basis = len(basis_rate)
# _filter_shape = tf.shape(filters)
# _filter_center = tf.slice(filters, [1, 1, 0, 0], [1, 1, _filter_shape[2], _filter_shape[3]])
if _number_of_basis < 2:
raise ValueError('Number of basis_rate must be larger or equal than 2')
input_shape = inputs.get_shape()
output_channel = filters.get_shape()[-1]
global_average_pooling = global_avg_pooling_layer(inputs, upsample=False)
depth = 256
selection_weights1 = kernels([input_shape[-1], depth],
regularizer=slim.l2_regularizer(0.0001),
name='rate_selection_weights1')
selection_weights2 = kernels([depth, _number_of_basis],
regularizer=slim.l2_regularizer(0.0001),
name='rate_selection_weights2')
global_avg_pooling_squeezed = tf.squeeze(global_average_pooling, axis=[1, 2])
selection = tf.matmul(global_avg_pooling_squeezed, selection_weights1)
selection = batch_norm(selection, is_training, batch_norm_decay)
selection = tf.nn.relu(selection)
selection = tf.matmul(selection, selection_weights2)
selection = batch_norm(selection, is_training, batch_norm_decay)
selection = tf.nn.relu(selection)
selection = tf.transpose(selection, [1, 0])
output = None
for idx, r in enumerate(basis_rate):
if idx == 0:
output = tf.einsum('nhwc,n->nhwc', atrous_conv2d(inputs, filters, r, bias, padding, stride), selection[idx])
output += tf.einsum('nhwc,n->nhwc', atrous_conv2d(inputs, filters, r, bias, padding, stride), selection[idx])
if to_batch_norm:
output = batch_norm(output, is_training, batch_norm_decay)
if activation_fn is not None:
output = activation_fn(output)
return output
def optimize_linear(grad: tf.Tensor, eps: float, norm=np.inf) -> tf.Tensor:
"""
Solves for the optimal input to a linear function under a norm constraint.
Optimal_perturbation = argmax_{eta, ||eta||_{norm} < eps} dot(eta, grad)
:param grad: tf tensor containing a batch of gradients
:param eps: float scalar specifying size of constraint region
:param norm: int specifying order of norm
:returns: tf tensor containing optimal perturbation
"""
# Convert the iterator returned by `range` into a list.
axis = list(range(1, len(grad.get_shape())))
avoid_zero_div = 1e-12
if norm == np.inf:
# Take sign of gradient
optimal_perturbation = tf.sign(grad)
# The following line should not change the numerical results. It
# applies only because
# `optimal_perturbation` is the output of a `sign` op, which has zero
# derivative anyway.
# It should not be applied for the other norms, where the perturbation
# has a non-zero derivative.
optimal_perturbation = tf.stop_gradient(optimal_perturbation)
elif norm == 1:
abs_grad = tf.abs(grad)
sign = tf.sign(grad)
max_abs_grad = tf.reduce_max(abs_grad, axis, keepdims=True)
tied_for_max = tf.dtypes.cast(tf.equal(abs_grad, max_abs_grad),
dtype=tf.float32)
num_ties = tf.reduce_sum(tied_for_max, axis, keepdims=True)
optimal_perturbation = sign*tied_for_max/num_ties
elif norm == 2:
square = tf.maximum(
avoid_zero_div, tf.reduce_sum(tf.square(grad), axis,
keepdims=True))
optimal_perturbation = grad/tf.sqrt(square)
else:
raise NotImplementedError(
"Only L-inf, L1 and L2 norms are currently implemented.")
# Scale perturbation to be the solution for the norm=eps rather than
# norm=1 problem
scaled_perturbation = tf.multiply(eps, optimal_perturbation)
return scaled_perturbation
def SpatialAttention(x: tf.Tensor, name: str, k: int=1024):
"""
空间注意力转移 https://www.e-learn.cn/content/qita/678740 与原始论文有区别
:param x: [batch_size, height, width, channel]
:param name:
:param k:
:return:
"""
with tf.variable_scope(name, reuse=tf.AUTO_REUSE) as scope:
_, H, W, C = x.get_shape()
w = tf.get_variable(name="attention_w", shape=[C, 1], dtype=tf.float32, initializer=tf.glorot_uniform_initializer())
b = tf.get_variable(initializer=tf.constant(0.0, dtype=tf.float32, shape=[1]), trainable=True, name='attention_b')
spatial_attention = tf.matmul(tf.reshape(x, [-1, C]), w) + b # 每一个空间点位置的attention 多个通道的同一个位置 生成一个概率
spatial_attention = tf.nn.sigmoid(tf.reshape(spatial_attention, [-1, W * H])) # batch_size, w*h
spatial_attention = tf.tile(input=spatial_attention, multiples=[1, C]) # batch_size, w*h*c
attention = tf.reshape(spatial_attention, [-1, H, W, C]) # batch_size, height, w, channel
attention_x = tf.multiply(x=x, y=attention)
return attention_x
def call(self, y_true: tf.Tensor, y_pred: tf.Tensor) -> tf.Tensor:
if isinstance(y_pred, tf.RaggedTensor):
y_pred = y_pred.to_tensor(y_pred.dtype.min)
y_true = tf.cast(y_true, y_pred.dtype)
y_pred = pad2shape(y_pred, tf.shape(y_true))
sample_size = tf.reduce_prod(tf.shape(y_true)[:self.flatten_axis])
y_true = tf.reshape(y_true, (sample_size, -1))
y_pred = tf.reshape(y_pred, (sample_size, -1))
y_pred = (1 - 2 * y_true) * y_pred
y_pred_neg: tf.Tensor = y_pred - y_true * y_pred.dtype.max
y_pred_pos: tf.Tensor = y_pred - (1 - y_true) * y_pred.dtype.max
zeros = tf.zeros_like(y_pred[..., :1]) # 用于生成logsum中的1
y_pred_neg = tf.concat([y_pred_neg, zeros], axis=-1)
y_pred_pos = tf.concat([y_pred_pos, zeros], axis=-1)
neg_loss = tf.math.reduce_logsumexp(y_pred_neg, axis=-1)
pos_loss = tf.math.reduce_logsumexp(y_pred_pos, axis=-1)
return neg_loss + pos_loss
def se_module(inputs: tf.Tensor, inner_features: int) -> tf.Tensor:
input_features = inputs.get_shape().as_list()[-1]
x = tf.reduce_mean(inputs, axis=[1, 2])
x = tf.layers.dense(x,
inner_features,
kernel_initializer=tf.keras.initializers.he_normal(),
kernel_regularizer=tf.keras.regularizers.l2(
common.L2_REGULARIZATION))
x = tf.nn.relu(x)
x = tf.layers.dense(x,
input_features,
kernel_initializer=tf.keras.initializers.he_normal(),
kernel_regularizer=tf.keras.regularizers.l2(
common.L2_REGULARIZATION))
x = tf.nn.sigmoid(x)
x = tf.reshape(x, (-1, 1, 1, input_features))
return x * inputs
def predict(self, position_indices_t: tf.Tensor):
ndiffs = position_indices_t.get_shape().as_list()[0]
if ndiffs == 0:
return tf.zeros(shape=[], dtype='float32')
batch_obj_views_t = tf.gather(self._obj_views_all_t, position_indices_t)
batch_obj_views_t = fftshift_t(batch_obj_views_t)
exit_waves_t = batch_obj_views_t * self.probe_cmplx_t
out_wavefronts_t = propTF_t(exit_waves_t,
reuse_transfer_function=True,
transfer_function=self._transfer_function)
amplitudes_t = tf.abs(out_wavefronts_t)
if self.upsampling_factor > 1:
amplitudes_t = self._downsample(amplitudes_t)
return amplitudes_t
def predict(self,
position_indices_t: tf.Tensor,
scope_name: str = "") -> tf.Tensor:
scope_name = scope_name + "_predict" if scope_name else "predict"
ndiffs = position_indices_t.get_shape().as_list()[0]
with tf.name_scope(scope_name) as scope:
if ndiffs == 0:
return tf.zeros(shape=[], dtype='complex64', name=scope)
batch_obj_views_t = tf.gather(self._obj_views_all_t,
position_indices_t)
batch_obj_views_t = fftshift_t(batch_obj_views_t)
exit_waves_t = batch_obj_views_t * self.probe_cmplx_t
farfield_waves_t = propFF_t(exit_waves_t)
return farfield_waves_t #tf.reshape(tf.stack([tf.real(farfield_waves_t), tf.imag(farfield_waves_t)]), [-1])
def map_func(filepath: tf.Tensor, label: tf.Tensor, processing=False):
# - read file and assign label -
fname = filepath.numpy().decode('utf-8')
f = np.loadtxt(fname).astype('float32')
lb = label
lb.set_shape(lb.shape)
# - processing if needed -
if processing:
f = f / f.max()
# f_std = (f - f.min(axis=0)) / (f.max(axis=0) - f.min(axis=0))
# f = f_std * (1 - 0) + 0
# print(f.shape[:])
f = np.reshape(f, (f.shape[0], f.shape[1], 1))
f = tf.convert_to_tensor(f, dtype=tf.float32)
f.set_shape(f.shape)
return f, lb
def _attention_images_summary(alignments: tf.Tensor,
prefix: str = "") -> tf.Operation:
# https://github.com/tensorflow/nmt/blob/master/nmt/attention_model.py
"""
Create attention image and attention summary.
"""
# Reshape to (batch, tgt_seq_len, src_seq_len, 1)
print("alignments", alignments.get_shape())
attention_images = tf.expand_dims(tf.expand_dims(alignments, axis=-1),
axis=-1)
attention_images = tf.transpose(attention_images,
perm=(0, 2, 1,
3)) # make img horizontal
# Scale to range [0, 255]
attention_images *= 255
attention_summary = tf.contrib.summary.image(
f"{prefix}/attention_images", attention_images)
return attention_summary
def displace(specimen: tf.Tensor) -> tf.Tensor:
"""
Creates mutated offspring by selecting random gene(index in an array)
and inserting it into random place in the same array
:param specimen: solution to mutate
:return: mutated offspring
"""
specimen = specimen.numpy()
gene_id, placement = np.random.randint(0, len(specimen), 2)
gene = specimen[gene_id]
specimen = np.delete(specimen, gene_id)
specimen = np.insert(specimen, placement, gene)
return tf.convert_to_tensor(specimen)
def lowrankMask(self, X: Tensor):
nFolds = np.array(self.nFolds)
foldNumber = self.foldNumber
M = np.array(X.get_shape().as_list())
F = len(M)
nValues = M//nFolds
folds = np.zeros(np.product(M)).flatten()
folds[foldNumber] = 1.
folds = folds.reshape(M)
foldNumbers = np.array(np.where(folds == 1.)).flatten()
U = []
for f in range(F):
Uf = self.testMask(M[f], foldNumbers[f], nFolds[f], nValues[f])
U.append(tf.constant(Uf))
return(U)
def _get_kernel_regularizer(kernel_tensor: tf.Tensor) -> Union[None, tf.Tensor]:
"""
Get a kernel regularizer of the same kind as attached to kernel_tensor
:param kernel_tensor: Kernel tensor to check for regularization
:return: A new kernel regularizer if kernel_tensor has regularization, None otherwise
"""
kernel_regularizer = None
for consumer in kernel_tensor.consumers():
if consumer.type == 'L2Loss':
# Try to see if there is a scale value associated with it
try:
l2_regularizer_mul = consumer.outputs[0].consumers()[0]
scale_op = l2_regularizer_mul.inputs[0].op
scale_val = scale_op.get_attr('value').float_val[0]
kernel_regularizer = tf.contrib.layers.l2_regularizer(scale_val)
except: # pylint: disable=bare-except
kernel_regularizer = tf.nn.l2_loss # pylint: disable=no-member
return kernel_regularizer
def _convolution(last_layer: tf.Tensor, last_n_channels: int, filter_size: int,
n_filters: int) -> tf.Tensor:
"""Applies convolution on a filter bank."""
conv_w = tf.get_variable(
"wieghts",
shape=[filter_size, filter_size, last_n_channels, n_filters],
initializer=tf.truncated_normal_initializer(stddev=.1))
conv_b = tf.get_variable("biases",
shape=[n_filters],
initializer=tf.constant_initializer(.1))
conv_activation = tf.nn.conv2d(last_layer, conv_w, [1, 1, 1, 1],
"SAME") + conv_b
assert_shape(conv_activation, [
None,
last_layer.get_shape()[1].value,
last_layer.get_shape()[2].value, filter_size
])
return tf.nn.relu(conv_activation)
def shuffle_block(inputs: tf.Tensor,
features: int,
is_training: bool,
stride: int,
groups: int = 8) -> tf.Tensor:
if stride > 1:
first_branch, second_branch = inputs, inputs
else:
first_branch, second_branch = tf.split(inputs,
num_or_size_splits=2,
axis=-1)
input_features = inputs.get_shape().as_list()[-1]
if stride > 1:
first_branch = depthwise_convo_bn(first_branch, features, is_training,
stride)
first_branch = convo_bn_relu(first_branch, features, 1, is_training, 1)
second_branch = convo_bn_relu(second_branch, features, 1, is_training, 1)
second_branch = depthwise_convo_bn(second_branch, features, is_training,
stride)
if stride == 1:
second_branch = convo_bn(second_branch, features, 1, is_training, 1)
else:
second_branch = convo_bn_relu(second_branch, features, 1, is_training,
1)
second_branch = se_module(second_branch, features // 2)
if stride == 1:
if input_features != features:
inputs = projection_convo(inputs, features, 1)
second_branch = inputs + second_branch
second_branch = tf.nn.relu(second_branch)
res = tf.concat([first_branch, second_branch], axis=-1)
feats = res.get_shape().as_list()[-1]
input_shape = tf.shape(res)
res = tf.reshape(res, (input_shape[0], input_shape[1], input_shape[2],
groups, feats // groups))
res = tf.transpose(res, perm=[0, 1, 2, 4, 3])
res = tf.reshape(res,
(input_shape[0], input_shape[1], input_shape[2], feats))
return res
def _fetch(
self, tensor: tf.Tensor,
data_dict: typing.Optional[utils.DataDict] = None,
batch_size: int = 4096, noisy: bool = False,
progress_bar: bool = False, random_seed: int = config._USE_GLOBAL
) -> np.ndarray:
if data_dict is None:
return self.sess.run(tensor)
if noisy:
random_seed = config.RANDOM_SEED \
if random_seed == config._USE_GLOBAL else random_seed
random_state = np.random.RandomState(seed=random_seed)
result_shape = tensor.get_shape().as_list()
if result_shape[0] is None:
result_shape[0] = data_dict.shape[0]
result = np.empty(result_shape)
@utils.minibatch(batch_size, desc="fetch", use_last=True,
progress_bar=progress_bar)
def _fetch_minibatch(data_dict, result):
feed_dict = {self.training_flag: False}
if "exprs" in data_dict and "library_size" in data_dict:
x = data_dict["exprs"]
normalized_x = self.prob_module._normalize(x, data_dict["library_size"])
feed_dict.update({
self.x: utils.densify(x),
self.noisy_x: self.prob_module._add_noise(
utils.densify(normalized_x), random_state
) if noisy else utils.densify(normalized_x),
self.library_size: data_dict["library_size"]
})
# Tensorflow random samplers are fixed after creation,
# making it impossible to re-seed and generate reproducible
# results, so we use numpy samplers instead.
# Also, local RandomState object is used to ensure thread-safety.
for module in [self.latent_module, self.prob_module, *self.rmbatch_modules]:
try:
feed_dict.update(module._build_feed_dict(data_dict))
except Exception:
pass
result[:] = self.sess.run(tensor, feed_dict=feed_dict)
_fetch_minibatch(data_dict, result)
return result
def write_tensor_as_bin(tensor: tf.Tensor, output_path: str):
"""Write tensor as a binary file.
Uses big endian for compatibility with whizzscooters/raven-android tests.
"""
if tensor.dtype == tf.float32:
tensor.numpy().flatten().astype(">f4").tofile(output_path)
elif tensor.dtype == tf.int32:
tensor.numpy().flatten().astype(">i4").tofile(output_path)
elif tensor.dtype == tf.uint8:
tensor.numpy().flatten().astype(">i1").tofile(output_path)
else:
raise NotImplementedError('Saving for %s is not implemented.' %
(tensor.dtype))
def Basic2dConv(x: tf.Tensor,
d_out: int,
name: str,
ksize: tuple = (3, 3),
stride: tuple = (1, 1),
active=None,
trainable: bool = True,
use_bias: bool = True,
dtype=tf.float32,
padding: str = 'SAME'):
"""
卷积层
:param x tensor
:param d_out int 卷积核数目
:param ksize list 卷积核尺寸
:param active 激活函数
:param trainable
:param padding SAME或者VALID
"""
d_in = x.get_shape()[-1].value
with tf.variable_scope(name, reuse=tf.AUTO_REUSE) as scope:
kernel = tf.get_variable(
name="w",
shape=[ksize[0], ksize[1], d_in, d_out],
dtype=dtype,
initializer=tf.contrib.layers.xavier_initializer_conv2d(),
trainable=trainable)
conv = tf.nn.conv2d(x,
kernel, [1, stride[0], stride[1], 1],
padding=padding)
if use_bias:
bias = tf.get_variable(initializer=tf.constant(0.0,
dtype=dtype,
shape=[d_out]),
trainable=trainable,
name='b')
conv_plus_bias = tf.nn.bias_add(conv, bias)
else:
conv_plus_bias = conv
if active is not None:
return active(conv_plus_bias, name="active")
else:
return conv_plus_bias
def __call__(self,X:tf.Tensor):
""" (batch,h,w,channels) """
input_shape=X.get_shape().as_list()
W=kernel_var(shape=(self.kernel_size,self.kernel_size,input_shape[3],self.filters),type=self.kernel_initializer,dtype=X.dtype,name="W_"+self.name)
self.res = tf.nn.conv2d(X, W, strides=[1, self.strides[0], self.strides[1], 1], padding=self.padding)
if self.use_bias:
self.res+=bias_var(shape=(self.filters,),type=self.bias_initializer,dtype=X.dtype,name="B_"+self.name)
if self.activation is not None:
self.res=activation(self.res,self.activation,name=self.name)
return self.res
def basic_block(input_layer: tf.Tensor, name):
"""
Creates the basic block for HRNet (Conv, BN, ReLu, Conv, BN, Add(residual), ReLU)
:param name: name of the layers in the block
:param input_layer: input layer of the basic block
:return: output layer of basic block
"""
_, _, _, n_filters = input_layer.get_shape()
x = conv_2d(inputs=input_layer,
filters=n_filters,
kernel_size=3,
activation=leaky_relu,
name=name + '_0')
x = conv_2d(inputs=x, filters=n_filters, kernel_size=3, name=name + '_1')
x = tf.keras.layers.Add(name=name + '_add')([input_layer, x])
x = leaky_relu(x, name=name + 'leaky_ReLU')
return x
def process_image_train(self, img_path: tf.Tensor, purpose):
""" * Callback function for tf.data.Dataset.map to process each image file path.
* For each image file path, it returns a corresponding (image, label) pair.
* This is the parent function that wraps all other processing helpers.
* This is the processing for the training data specifically.
Params:
img_path - tf.Tensor, representing the path to an image file
purpose - "train" for training; "val" for validation; "test" for testing
Returns:
img, label - tuple of (tf.float32, tf.uint8) arrays representing the image and label arrays
"""
label_path = self.get_label_path(img_path, purpose)
input_image = self.read_npy(img_path.numpy(), img_channels=4)
input_label = self.read_npy(label_path.numpy(), label=True)
#input_image = self.read_nifti(img_path.numpy(), img_channels=4)
#input_label = self.read_nifti(label_path.numpy(), label=True)
# Make label binary for tumor region in question
if self.tumor_region:
input_label = tf.where(
input_label >= tf.constant(TUMOR_REGIONS[self.tumor_region],
dtype=tf.int32),
tf.constant(1, dtype=tf.int32), tf.constant(0, dtype=tf.int32))
# Fetch random image patch
image_patch, label_patch = self.get_random_patch(
input_image, input_label)
weight_map = self.get_weight_map(image_patch, label_patch)
# Normalize image patch AFTER creating the patch
image_patch = self.normalize(image_patch)
if purpose == "train":
# Augment Data
image_patch, label_patch = self.augment_patch(
image_patch, label_patch)
return image_patch, label_patch
def l2_project( # pylint: disable=invalid-name
Zp: tf.Tensor,
P: tf.Tensor,
Zq: tf.Tensor,
) -> tf.Tensor:
"""Project distribution (Zp, P) onto support Zq under the L2-metric over CDFs.
This projection works for any support Zq.
Let Kq be len(Zq) and Kp be len(Zp).
Args:
Zp: (batch_size, Kp) Support of distribution P
P: (batch_size, Kp) Probability values for P(Zp[i])
Zq: (Kp,) Support to project onto
Returns:
L2 projection of (Zp, P) onto Zq.
"""
# Asserts that Zq has no leading dimension of size 1.
if Zq.get_shape().ndims > 1:
Zq = tf.squeeze(Zq, axis=0)
# Extracts vmin and vmax and construct helper tensors from Zq.
vmin, vmax = Zq[0], Zq[-1]
d_pos = tf.concat([Zq, vmin[None]], 0)[1:]
d_neg = tf.concat([vmax[None], Zq], 0)[:-1]
# Clips Zp to be in new support range (vmin, vmax).
clipped_zp = tf.clip_by_value(Zp, vmin, vmax)[:, None, :]
clipped_zq = Zq[None, :, None]
# Gets the distance between atom values in support.
d_pos = (d_pos - Zq)[None, :, None] # Zq[i+1] - Zq[i]
d_neg = (Zq - d_neg)[None, :, None] # Zq[i] - Zq[i-1]
delta_qp = clipped_zp - clipped_zq # Zp[j] - Zq[i]
d_sign = tf.cast(delta_qp >= 0., dtype=P.dtype)
delta_hat = (d_sign * delta_qp / d_pos) - (
(1. - d_sign) * delta_qp / d_neg)
P = P[:, None, :]
return tf.reduce_sum(tf.clip_by_value(1. - delta_hat, 0., 1.) * P, 2)
def apply(self, x: tf.Tensor) -> tf.Tensor:
channels_in = x.get_shape().as_list()[-1]
if self._stride == 1 and channels_in == self._channels:
skip_connection = x
else:
skip_connection = self._conv_fn(x, num_outputs=self._channels, kernel_size=self._extra_dim + (1, 1),
stride=self._extra_dim+(self._stride, self._stride), scope='skip')
with tf.variable_scope('c1'):
x = self._conv_fn(x, num_outputs=self._channels, kernel_size=self._extra_dim+(3, 3),
stride=self._extra_dim+(self._stride, self._stride), scope='c1')
x = self._bn_fn(x)
x = self._ln_fn(x)
with tf.variable_scope('c2'):
x = self._conv_fn(x, num_outputs=self._channels, kernel_size=self._extra_dim+(3, 3), stride=1, scope='c2')
x = self._bn_fn(x)
x = self._ln_fn(x)
x += skip_connection
return x
def predict(self, position_indices_t: tf.Tensor):
ndiffs = position_indices_t.get_shape().as_list()[0]
if ndiffs == 0:
return tf.zeros(shape=[], dtype='float32')
batch_rc_positions_indices = tf.gather(self._full_rc_positions_indices_t, position_indices_t)
batch_obj_views_t = tf.gather(self._obj_views_all_t, batch_rc_positions_indices[:, 1])
batch_phase_modulations_t = tf.gather(self._probe_phase_modulations_all_t, batch_rc_positions_indices[:, 0])
batch_obj_views_t = batch_obj_views_t
exit_waves_t = batch_obj_views_t * self.probe_cmplx_t * batch_phase_modulations_t
exit_waves_proj_t = fftshift_t(tf.reduce_sum(exit_waves_t, axis=-3))
out_wavefronts_t = propFF_t(exit_waves_proj_t)
amplitudes_t = tf.abs(out_wavefronts_t)
if self.upsampling_factor > 1:
amplitudes_t = self._downsample(amplitudes_t)
return amplitudes_t
def _tensordot_axes(
a: tf.Tensor,
axes: AXES_TYPE) -> Tuple[AXES_ENTRY_TYPE, AXES_ENTRY_TYPE]:
"""Generates two sets of contraction axes for the two tensor arguments."""
a_shape = a.get_shape()
if isinstance(axes, tf.compat.integral_types):
if axes < 0:
raise ValueError("'axes' must be at least 0.")
if a_shape.ndims is not None:
if axes > a_shape.ndims:
raise ValueError(
"'axes' must not be larger than the number of "
"dimensions of tensor %s." % a)
return (list(range(a_shape.ndims - axes,
a_shape.ndims)), list(range(axes)))
rank = tf.rank(a)
return (tf.range(rank - axes, rank,
dtype=tf.int32), tf.range(axes, dtype=tf.int32))
if isinstance(axes, (list, tuple)):
if len(axes) != 2:
raise ValueError("'axes' must be an integer or have length 2.")
a_axes = axes[0]
b_axes = axes[1]
if isinstance(a_axes, tf.compat.integral_types) and \
isinstance(b_axes, tf.compat.integral_types):
a_axes = [a_axes]
b_axes = [b_axes]
# NOTE: This fails if either a_axes and b_axes are Tensors.
if len(a_axes) != len(b_axes):
raise ValueError(
"Different number of contraction axes 'a' and 'b', %s != %s."
% (len(a_axes), len(b_axes)))
# The contraction indices do not need to be permuted.
# Sort axes to avoid unnecessary permutations of a.
# NOTE: This fails if either a_axes and b_axes contain Tensors.
# pylint: disable=len-as-condition
if len(a_axes) > 0:
a_axes, b_axes = list(zip(*sorted(zip(a_axes, b_axes))))
return a_axes, b_axes
axes = tf.convert_to_tensor(axes, name="axes", dtype=tf.int32)
return axes[0], axes[1]
def tensor_to_image(tensor: tf.Tensor, width: int, height: int, channels: int = 3) -> np.array:
"""
Convert tensor representation of an image into displayable array
:param tensor: tensor with image content
:param height: target image height
:param width: target image width
:param channels: number of channels in an image
:return: ND numpy array with image content
"""
tensor = tensor.reshape((height, width, channels))
# Remove zero-center by mean pixel
tensor[:, :, 0] += 103.939
tensor[:, :, 1] += 116.779
tensor[:, :, 2] += 123.68
tensor = tensor[:, :, ::-1]
return np.clip(tensor, 0, 255).astype('uint8')
def map_colorspace(images: tf.Tensor) -> tf.Tensor:
"""
TensorFlow graph function which converts images from RGB to CIE Lab colorspace.
This is essentially a wrapper for rgb_to_cielab to be usable in a graph.
Args:
images: 3 or 4 tensor. See rgb_to_cielab for detailed information.
Returns:
Converted images, see rgb_to_cielab for detailed information.
"""
[
images_lab,
] = tf.py_function(rgb_to_cielab, [images], [tf.float32])
# Make sure shape information is correct after py_function call
images_lab.set_shape(images.get_shape())
return images_lab
def blaze_block(x: tf.Tensor, filters, mid_channels=None, stride=1, phase_train=True):
# input is n,w,h,c
mid_channels = mid_channels or x.get_shape()[3]
assert stride in [1, 2]
use_pool = stride > 1
# tensorflow way to implement pad size = 2
pad_x = tf.pad(x, [[0, 0], [2, 2], [2, 2], [0, 0]], mode='CONSTANT')
conv1 = tf.layers.separable_conv2d(pad_x, filters=mid_channels, kernel_size=(5, 5), strides=stride, padding='VALID')
bn1 = tf.layers.batch_normalization(conv1, training=phase_train)
conv2 = tf.layers.conv2d(bn1, filters=filters, kernel_size=1, strides=1, padding='SAME')
bn2 = tf.layers.batch_normalization(conv2, training=phase_train)
if use_pool:
shortcut = tf.layers.max_pooling2d(x, pool_size=stride, strides=stride, padding='SAME')
shortcut = tf.layers.conv2d(shortcut, filters=filters, kernel_size=1, strides=1, padding='SAME')
shortcut = tf.layers.batch_normalization(shortcut, training=phase_train)
shortcut = tf.nn.relu(shortcut)
return tf.nn.relu(bn2 + shortcut)
return tf.nn.relu(bn2 + x)
def perceptron_layer(x: Tensor, out_dim, batch_norm=False, activation_fn=tf.sigmoid, name="hidden_layer"):
in_dim = x.get_shape().as_list()[1]
with tf.variable_scope(name) as v_scope:
w = tf.Variable(initial_value=tf.random_normal((in_dim, out_dim)))
b = tf.Variable(initial_value=tf.random_normal((out_dim,)))
prod = tf.einsum('ij,jk->ik', x, w)
if(batch_norm):
prod, b_scope = batch_normalization(prod, out_dim, b)
else:
prod = prod + b
total_v_coll = v_scope.global_variables()
if(b_scope):
total_v_coll.append(b_scope.global_variables())
if(activation_fn != None):
return activation_fn(prod), total_v_coll
else:
return prod, total_v_coll
def perceptronLayer(x: Tensor, out_dim, batch_norm=False, activation_fn=tf.sigmoid, name="hidden_layer"):
in_dim = x.get_shape().as_list()[1]
with tf.variable_scope(name):
w = tf.Variable(initial_value=tf.random_normal((in_dim, out_dim)))
b = tf.Variable(initial_value=tf.random_normal((out_dim,)))
prod = tf.einsum('ij,jk->ik', x, w)
if(batch_norm):
with tf.variable_scope('batch_norm'):
mean, var = tf.nn.moments(prod, axes=0)
v = tf.Variable(tf.ones([out_dim]))
prod = tf.div_no_nan(prod - mean, tf.sqrt(var + 1e-3))
prod = v * prod + b
else:
prod = prod + b
if(activation_fn != None):
return activation_fn(prod)
else:
return prod
def build_residual_block_connection(self, block_input: tf.Tensor,
block_output: tf.Tensor) -> tf.Tensor:
"""
Create residual connection by applying convolution on block_input
and add or concatenate it with block_output
Applies convolution with kernel and stride from sampling_params
Parameters
----------
block_input
feature maps before convolution block
block_output
feature maps after convolution block
Returns
-------
block_res
feature maps after residual connection
"""
filters = block_output.get_shape().as_list()[-1]
layer_name = self.get_current_layer_full_name("residual")
if self.sampling_type == 'encoder':
residual_layer = self.add_keras_layer(
tf.keras.layers.Conv2D(
filters=filters, activation=self.activation,
bias_initializer=self.initializer,
kernel_initializer=self.initializer,
name=layer_name, **self.sampling_params))
else:
residual_layer = self.add_keras_layer(
tf.keras.layers.Conv2DTranspose(
filters=filters, activation=self.activation,
bias_initializer=self.initializer,
kernel_initializer=self.initializer,
name=layer_name, **self.sampling_params))
res_connection = residual_layer(block_input)
if self.block_residual_connection_type == 'sum':
out = tf.add_n([block_output, res_connection])
else:
out = tf.concat([block_output, res_connection], -1)
return out
def attention(self,
query: tf.Tensor,
decoder_prev_state: tf.Tensor,
decoder_input: tf.Tensor,
loop_state: AttentionLoopState) -> Tuple[
tf.Tensor, AttentionLoopState]:
self.query_state_size = query.get_shape()[-1].value
y = tf.matmul(query, self.query_projection_matrix)
y = y + self.projection_bias_vector
y = tf.reshape(y, [-1, 1, 1, self.state_size])
energies = self.get_energies(y, loop_state.weights)
if self.attention_mask is None:
weights = tf.nn.softmax(energies)
else:
weights_all = tf.nn.softmax(energies) * self.attention_mask
norm = tf.reduce_sum(weights_all, 1, keepdims=True) + 1e-8
weights = weights_all / norm
# condition = tf.equal(self.attention_mask, 1)
# masked_logits = tf.where(
# tf.tile(condition, [tf.shape(energies)[0], 1]),
# energies, -np.inf * tf.ones_like(energies))
# weights = tf.nn.softmax(masked_logits)
# Now calculate the attention-weighted vector d.
context = tf.reduce_sum(
tf.expand_dims(tf.expand_dims(weights, -1), -1)
* self._att_states_reshaped, [1, 2])
context = tf.reshape(context, [-1, self.context_vector_size])
next_contexts = tf.concat(
[loop_state.contexts, tf.expand_dims(context, 0)], 0)
next_weights = tf.concat(
[loop_state.weights, tf.expand_dims(weights, 0)], 0)
next_loop_state = AttentionLoopState(
contexts=next_contexts,
weights=next_weights)
return context, next_loop_state
def label_smoothing(inputs: tf.Tensor, epsilon: float=0.1):
last_dim = inputs.get_shape().as_list()[-1]
return ((1 - epsilon) * inputs) + (epsilon / last_dim)