def test_make_mvn_dist_fn():
from indl.dists import make_mvn_dist_fn
input_dim = 4
dist_dim = 3
batch_size = 8
# Test with placeholder
inputs = tfkl.Input(shape=(input_dim, ))
# First the callable
make_dist_fn, dist_params = make_mvn_dist_fn(inputs,
dist_dim,
shift_std=0.1)
assert hasattr(make_dist_fn, '__call__')
# tensorflow.python.keras.engine.keras_tensor.KerasTensor
# assert isinstance(dist_params[0], tf.Tensor)
# assert isinstance(dist_params[1], tf.Tensor)
assert K.is_keras_tensor(dist_params[0])
assert K.is_keras_tensor(dist_params[1])
test_dist = make_dist_fn((dist_params[0], dist_params[1]))
assert isinstance(test_dist, tfd.Distribution)
# Then test using it to make a distribution
_dist_layer = tfpl.DistributionLambda(
make_distribution_fn=make_dist_fn,
# convert_to_tensor_fn=lambda s: s.sample(n_samples),
)
q_dist = _dist_layer(dist_params)
_run_assertions_on_qdist(q_dist, inputs, input_dim, dist_dim, batch_size)
def __call__(self, inputs, initial_state=None, constants=None, **kwargs):
inputs, initial_state, constants = self._standardize_args(
inputs, initial_state, constants, self._num_constants)
if initial_state is None and constants is None:
return super(ExternalAttentionRNNWrapper,
self).__call__(inputs, **kwargs)
# If any of `initial_state` or `constants` are specified and are Keras
# tensors, then add them to the inputs and temporarily modify the
# input_spec to include them.
additional_inputs = []
additional_specs = []
if initial_state is not None:
kwargs['initial_state'] = initial_state
additional_inputs += initial_state
self.state_spec = [
InputSpec(shape=K.int_shape(state)) for state in initial_state
]
additional_specs += self.state_spec
if constants is not None:
kwargs['constants'] = constants
additional_inputs += constants
self.constants_spec = [
InputSpec(shape=K.int_shape(constant))
for constant in constants
]
self._num_constants = len(constants)
additional_specs += self.constants_spec
# at this point additional_inputs cannot be empty
is_keras_tensor = K.is_keras_tensor(additional_inputs[0])
for tensor in additional_inputs:
if K.is_keras_tensor(tensor) != is_keras_tensor:
raise ValueError(
'The initial state or constants of an ExternalAttentionRNNWrapper'
' layer cannot be specified with a mix of'
' Keras tensors and non-Keras tensors'
' (a "Keras tensor" is a tensor that was'
' returned by a Keras layer, or by `Input`)')
if is_keras_tensor:
# Compute the full input spec, including state and constants
full_input = inputs + additional_inputs
full_input_spec = self.input_spec + additional_specs
# Perform the call with temporarily replaced input_spec
original_input_spec = self.input_spec
self.input_spec = full_input_spec
output = super(ExternalAttentionRNNWrapper,
self).__call__(full_input, **kwargs)
self.input_spec = self.input_spec[:len(original_input_spec)]
return output
else:
return super(ExternalAttentionRNNWrapper,
self).__call__(inputs, **kwargs)
def test_make_encd_variational(n_times=None):
from indl.model.beta_vae import make_encd_variational
params = {
'encd_rnn2_units': 14, # For constructing input
'zd_size': 4,
'qzd_init_std': 0.1,
'qzd_off_diag': False,
'q_samples': 1
}
inputs = tf.keras.Input(shape=(n_times, params['encd_rnn2_units']))
qzd = make_encd_variational(params, inputs)
assert K.is_keras_tensor(
qzd) # isinstance(qzd, tfd.MultivariateNormalDiag)
z_var = tf.keras.Model(inputs=inputs, outputs=qzd)
batch_size = 16
timesteps = n_times or 20
enc_z = tf.random.uniform(
(batch_size, timesteps, params['encd_rnn2_units']))
dummy_qzd = z_var(enc_z)
assert isinstance(dummy_qzd, tfd.MultivariateNormalDiag)
dummy_sample = dummy_qzd.sample(params['q_samples'])
assert dummy_sample.shape.as_list() == [
params['q_samples'], batch_size, timesteps, params['zd_size']
]
def __init__(self, include_top=True, input_tensor=None, input_shape=None, pooling=None, classes=8631):
super(ResNet50Model, self).__init__()
self.include_top = include_top
input_shape = _obtain_input_shape(input_shape, default_size=224, min_size=32, data_format=K.image_data_format(),
require_flatten=include_top)
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not K.is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
x = ResNet50Component(include_top=include_top)(img_input)
# x = AveragePooling2D((7, 7), name='avg_pool')(x)
x = Flatten()(x)
if pooling == 'avg':
x = GlobalAveragePooling2D()(x)
elif pooling == 'max':
x = GlobalMaxPooling2D()(x)
if input_tensor is not None:
inputs = get_source_inputs(input_tensor)
else:
inputs = img_input
super(ResNet50Model, self).__init__(inputs, x, name='vggface_resnet50')
def nn_base(input_tensor=None, input_shape = (None, None, 3), trainable=False):
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not K.is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
bn_axis = 3
x = ZeroPadding2D((3, 3))(img_input)
x = Conv2D(64, (7, 7), strides=(2, 2), name='conv1', trainable = trainable)(x)
x = BatchNormalization(axis=bn_axis, name='bn_conv1')(x)
x = Activation('relu')(x)
x = MaxPool2D((3, 3), strides=(2, 2))(x)
x = conv_block(x, 3, [64, 64, 256], stage=2, block='a', strides=(1, 1), trainable = trainable)
x = identity_block(x, 3, [64, 64, 256], stage=2, block='b', trainable = trainable)
x = identity_block(x, 3, [64, 64, 256], stage=2, block='c', trainable = trainable)
x = conv_block(x, 3, [128, 128, 512], stage=3, block='a', trainable = trainable)
x = identity_block(x, 3, [128, 128, 512], stage=3, block='b', trainable = trainable)
x = identity_block(x, 3, [128, 128, 512], stage=3, block='c', trainable = trainable)
x = identity_block(x, 3, [128, 128, 512], stage=3, block='d', trainable = trainable)
x = conv_block(x, 3, [256, 256, 1024], stage=4, block='a', trainable = trainable)
x = identity_block(x, 3, [256, 256, 1024], stage=4, block='b', trainable = trainable)
x = identity_block(x, 3, [256, 256, 1024], stage=4, block='c', trainable = trainable)
x = identity_block(x, 3, [256, 256, 1024], stage=4, block='d', trainable = trainable)
x = identity_block(x, 3, [256, 256, 1024], stage=4, block='e', trainable = trainable)
x = identity_block(x, 3, [256, 256, 1024], stage=4, block='f', trainable = trainable)
return x
def test_make_encs_variational():
from indl.model.beta_vae import make_encs_variational
params = {
'encs_rnn_units':
12, # Only needed to emulate previous layer's outputs
'dropout_rate': 0.01,
'zs_size': 10,
'qzs_off_diag': False,
'qzs_init_std': 0.1,
'q_samples': 2
}
encoded_s = tf.keras.Input(shape=(params['encs_rnn_units'], ))
qzs = make_encs_variational(params, encoded_s)
# make_f_variational is a lightweight wrapper around `make_variational` which has its own tests.
# There isn't much left to test here so let's just assert its type.
assert K.is_keras_tensor(
qzs) # isinstance(qzs, tfd.MultivariateNormalDiag)
make_encs_var = tf.keras.Model(inputs=encoded_s,
outputs=qzs,
name="make_encs_var_model")
batch_size = 16
encoded_s = tf.random.uniform((batch_size, params['encs_rnn_units']))
dummy_qzs = make_encs_var(encoded_s)
assert isinstance(dummy_qzs, tfd.MultivariateNormalDiag)
dummy_sample = dummy_qzs.sample(params['q_samples'])
assert dummy_sample.shape.as_list() == [
params['q_samples'], batch_size, params['zs_size']
]
def nn_base(input_tensor=None, trainable=False):
# Determine proper input shape
if K.image_data_format() == 'channels_first':
input_shape = (3, None, None)
else:
input_shape = (None, None, 3)
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not K.is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
if K.image_data_format() == 'channels_last':
bn_axis = 3
else:
bn_axis = 1
x = ZeroPadding2D((3, 3))(img_input)
x = Convolution2D(64, (7, 7), strides=(
2, 2), name='conv1', trainable=trainable)(x)
x = FixedBatchNormalization(axis=bn_axis, name='bn_conv1')(x)
x = Activation('relu')(x)
x = MaxPooling2D((3, 3), strides=(2, 2))(x)
x = conv_block(x, 3, [64, 64, 256], stage=2, block='a',
strides=(1, 1), trainable=trainable)
x = identity_block(x, 3, [64, 64, 256], stage=2,
block='b', trainable=trainable)
x = identity_block(x, 3, [64, 64, 256], stage=2,
block='c', trainable=trainable)
x = conv_block(x, 3, [128, 128, 512], stage=3,
block='a', trainable=trainable)
x = identity_block(x, 3, [128, 128, 512], stage=3,
block='b', trainable=trainable)
x = identity_block(x, 3, [128, 128, 512], stage=3,
block='c', trainable=trainable)
x = identity_block(x, 3, [128, 128, 512], stage=3,
block='d', trainable=trainable)
x = conv_block(x, 3, [256, 256, 1024], stage=4,
block='a', trainable=trainable)
x = identity_block(x, 3, [256, 256, 1024], stage=4,
block='b', trainable=trainable)
x = identity_block(x, 3, [256, 256, 1024], stage=4,
block='c', trainable=trainable)
x = identity_block(x, 3, [256, 256, 1024], stage=4,
block='d', trainable=trainable)
x = identity_block(x, 3, [256, 256, 1024], stage=4,
block='e', trainable=trainable)
x = identity_block(x, 3, [256, 256, 1024], stage=4,
block='f', trainable=trainable)
return x
def vgg_network(input_tensor=None):
"""
Generating VGG16 network.
:param input_tensor: get the uses tensorflow.
:return: VGG16 network.
"""
# Determine proper input shape
if K.image_data_format() == 'channels_first':
input_shape = (3, None, None)
else:
input_shape = (None, None, 3)
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not K.is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
if K.image_data_format() == 'channels_last':
bn_axis = 3
else:
bn_axis = 1
# Block 1
x = Conv2D(64, (3, 3), activation='relu', padding='same', name='block1_conv1')(img_input)
x = Conv2D(64, (3, 3), activation='relu', padding='same', name='block1_conv2')(x)
x = MaxPooling2D((2, 2), strides=(2, 2), name='block1_pool')(x)
# Block 2
x = Conv2D(128, (3, 3), activation='relu', padding='same', name='block2_conv1')(x)
x = Conv2D(128, (3, 3), activation='relu', padding='same', name='block2_conv2')(x)
x = MaxPooling2D((2, 2), strides=(2, 2), name='block2_pool')(x)
# Block 3
x = Conv2D(256, (3, 3), activation='relu', padding='same', name='block3_conv1')(x)
x = Conv2D(256, (3, 3), activation='relu', padding='same', name='block3_conv2')(x)
x = Conv2D(256, (3, 3), activation='relu', padding='same', name='block3_conv3')(x)
x = MaxPooling2D((2, 2), strides=(2, 2), name='block3_pool')(x)
# Block 4
x = Conv2D(512, (3, 3), activation='relu', padding='same', name='block4_conv1')(x)
x = Conv2D(512, (3, 3), activation='relu', padding='same', name='block4_conv2')(x)
x = Conv2D(512, (3, 3), activation='relu', padding='same', name='block4_conv3')(x)
x = MaxPooling2D((2, 2), strides=(2, 2), name='block4_pool')(x)
# Block 5
x = Conv2D(512, (3, 3), activation='relu', padding='same', name='block5_conv1')(x)
x = Conv2D(512, (3, 3), activation='relu', padding='same', name='block5_conv2')(x)
x = Conv2D(512, (3, 3), activation='relu', padding='same', name='block5_conv3')(x)
# x = MaxPooling2D((2, 2), strides=(2, 2), name='block5_pool')(x)
return x
def VGG16_wBN(input_tensor=None, input_shape=None, classes=1000, conv_dropout=0.1, dropout=0.3, activation='relu'):
"""Instantiates the VGG16 architecture with Batch Normalization
# Arguments
input_tensor: Keras tensor (i.e. output of `layers.Input()`) to use as image input for the model.
input_shape: shape tuple
classes: optional number of classes to classify images, 1000 as per the imagenet
# Returns
A Keras model instance.
"""
img_input = Input(shape=input_shape) if input_tensor is None else (
Input(tensor=input_tensor, shape=input_shape) if not K.is_keras_tensor(input_tensor) else input_tensor
)
# Block 1
x = conv_block(32, dropout=conv_dropout, activation=activation, block=1, layer=1)(img_input)
x = conv_block(32, dropout=conv_dropout, activation=activation, block=1, layer=2)(x)
x = MaxPooling2D((2, 2), strides=(2, 2), name='block1_pool')(x)
# Block 2
x = conv_block(64, dropout=conv_dropout, activation=activation, block=2, layer=1)(x)
x = conv_block(64, dropout=conv_dropout, activation=activation, block=2, layer=2)(x)
x = MaxPooling2D((2, 2), strides=(2, 2), name='block2_pool')(x)
# Block 3
x = conv_block(128, dropout=conv_dropout, activation=activation, block=3, layer=1)(x)
x = conv_block(128, dropout=conv_dropout, activation=activation, block=3, layer=2)(x)
x = conv_block(128, dropout=conv_dropout, activation=activation, block=3, layer=3)(x)
x = MaxPooling2D((2, 2), strides=(2, 2), name='block3_pool')(x)
# Block 4
x = conv_block(256, dropout=conv_dropout, activation=activation, block=4, layer=1)(x)
x = conv_block(256, dropout=conv_dropout, activation=activation, block=4, layer=2)(x)
x = conv_block(256, dropout=conv_dropout, activation=activation, block=4, layer=3)(x)
x = MaxPooling2D((2, 2), strides=(2, 2), name='block4_pool')(x)
# Block 5
x = conv_block(256, dropout=conv_dropout, activation=activation, block=5, layer=1)(x)
x = conv_block(256, dropout=conv_dropout, activation=activation, block=5, layer=2)(x)
x = conv_block(256, dropout=conv_dropout, activation=activation, block=5, layer=3)(x)
x = MaxPooling2D((2, 2), strides=(2, 2), name='block5_pool')(x)
# Flatten
x = GlobalAveragePooling2D()(x)
# FC Layers
x = dense_block(512, dropout=dropout, activation=activation, name='fc1')(x)
x = dense_block(512, dropout=dropout, activation=activation, name='fc2')(x)
# Classification block
x = Dense(classes, activation='softmax', name='predictions')(x)
# Ensure that the model takes into account any potential predecessors of `input_tensor`.
inputs = get_source_inputs(input_tensor) if input_tensor is not None else img_input
# Create model.
return Model(inputs, x, name='vgg16_bn')
def model_mobilenet(input_tensor=None,
input_shape=None,
classes=1000,
alpha=1.0,
depth_multiplier=1,
dropout=1e-3,
include_top=True,
pooling=None,
weights=None,
data_format="channels_last"):
input_shape = deduce_input_shape(input_shape,
require_flatten=include_top,
weights=weights,
data_format=data_format)
if data_format == 'channels_last':
row_axis, col_axis = (0, 1)
else:
row_axis, col_axis = (1, 2)
rows = input_shape[row_axis]
cols = input_shape[col_axis]
if input_tensor is not None:
if not backend.is_keras_tensor(input_tensor):
raise ValueError("input_tensor must be a Keras layer tensor.")
img_input = input_tensor
else:
img_input = layers.Input(shape=input_shape)
# construct the convolutional network
net = cnn_mobilenet(img_input,
alpha=alpha,
depth_multiplier=depth_multiplier,
data_format=data_format)
if include_top:
# add the classification network
net = top_block(net,
classes=classes,
alpha=alpha,
dropout=dropout,
data_format=data_format)
else:
# add global pooling if required
net = pool_block(net, pooling, data_format)
if input_tensor is not None:
inputs = utils.get_source_inputs(input_tensor)
else:
inputs = img_input
# Create model.
model_name = 'mobilenet_%0.2f_%s' % (alpha, rows)
model = models.Model(inputs, net, name=model_name)
if weights == 'imagenet':
weight_path = get_weights_path(alpha, rows, include_top)
model.load_weights(weight_path)
elif weights is not None:
model.load_weights(weights)
return model
def shuffle_net(input_tensor,
scale_factor=1,
pooling='avg',
input_shape=(224, 224, 3),
groups=3,
botteleneck_ratio=0.25):
out_dim_stage_two = {1: 144, 2: 200, 3: 240, 4: 272, 8: 384}
num_shuffle_units = [3, 7, 3]
if pooling not in ['max', 'avg']:
raise ValueError('Invalid value for pooling')
# calculate output channels for each stage
exp = np.insert(np.arange(0, len(num_shuffle_units)), 0, 0)
out_channels_in_stage = 2**exp
out_channels_in_stage *= out_dim_stage_two[groups]
out_channels_in_stage[0] = 24 # fist stage has always 24 output channels
out_channels_in_stage *= scale_factor
out_channels_in_stage = out_channels_in_stage.astype(int)
if input_tensor is None:
img_input = layers.Input(shape=input_shape)
else:
if K.is_keras_tensor(input_tensor):
img_input = input_tensor
else:
img_input = layers.Input(tensor=input_tensor, shape=input_shape)
x = layers.Conv2D(filters=out_channels_in_stage[0],
kernel_size=(3, 3),
padding='same',
use_bias=False,
strides=(2, 2),
activation='relu',
name='conv1')(img_input)
x = layers.MaxPooling2D(pool_size=(3, 3),
strides=(2, 2),
padding='same',
name='max_pool1')(x)
# create stages containing shuffle-net units beginning at stage 2
for stage in range(len(num_shuffle_units)):
repeat = num_shuffle_units[stage]
x = _block(x,
out_channels_in_stage,
repeat=repeat,
bottleneck_ratio=botteleneck_ratio,
groups=groups,
stage=stage + 2)
return x
def DenseNet(blocks,
input_tensor=None,
input_shape=None,
pooling=None,
activation=lambda: layers.Activation('relu')):
if input_tensor is None:
img_input = layers.Input(shape=input_shape)
else:
if not backend.is_keras_tensor(input_tensor):
img_input = layers.Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
bn_axis = 3 if backend.image_data_format() == 'channels_last' else 1
x = layers.ZeroPadding2D(padding=((3, 3), (3, 3)))(img_input)
x = layers.Conv2D(64, 7, strides=2, use_bias=False, name='conv1/conv')(x)
x = layers.BatchNormalization(axis=bn_axis,
epsilon=1.001e-5,
name='conv1/bn')(x)
# x = layers.Activation(activation, name='conv1/activation')(x)
x = activation()(x)
x = layers.ZeroPadding2D(padding=((1, 1), (1, 1)))(x)
x = layers.MaxPooling2D(3, strides=2, name='pool1')(x)
x = dense_block(x, blocks[0], name='conv2', activation=activation)
x = transition_block(x, 0.5, name='pool2', activation=activation)
x = dense_block(x, blocks[1], name='conv3', activation=activation)
x = transition_block(x, 0.5, name='pool3', activation=activation)
x = dense_block(x, blocks[2], name='conv4', activation=activation)
x = transition_block(x, 0.5, name='pool4', activation=activation)
x = dense_block(x, blocks[3], name='conv5', activation=activation)
x = layers.BatchNormalization(axis=bn_axis, epsilon=1.001e-5, name='bn')(x)
# x = layers.Activation(activation, name='activation')(x)
x = activation()(x)
if pooling == 'avg':
x = layers.GlobalAveragePooling2D(name='avg_pool')(x)
elif pooling == 'max':
x = layers.GlobalMaxPooling2D(name='max_pool')(x)
# Ensure that the model takes into account
# any potential predecessors of `input_tensor`.
if input_tensor is not None:
inputs = layer_utils.get_source_inputs(input_tensor)
else:
inputs = img_input
return inputs, x
def nn_base(input_tensor=None, trainable=False):
# Determine proper input shape
if K.image_dim_ordering() == 'th':
input_shape = (3, None, None)
else:
input_shape = (None, None, 3)
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not K.is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
if K.image_dim_ordering() == 'tf':
bn_axis = 3
else:
bn_axis = 1
# Block 1
x = Conv2D(64, (3, 3), activation='relu', padding='same', name='block1_conv1')(img_input)
x = Conv2D(64, (3, 3), activation='relu', padding='same', name='block1_conv2')(x)
x = MaxPooling2D((2, 2), strides=(2, 2), name='block1_pool')(x)
# Block 2
x = Conv2D(128, (3, 3), activation='relu', padding='same', name='block2_conv1')(x)
x = Conv2D(128, (3, 3), activation='relu', padding='same', name='block2_conv2')(x)
x = MaxPooling2D((2, 2), strides=(2, 2), name='block2_pool')(x)
# Block 3
x = Conv2D(256, (3, 3), activation='relu', padding='same', name='block3_conv1')(x)
x = Conv2D(256, (3, 3), activation='relu', padding='same', name='block3_conv2')(x)
x = Conv2D(256, (3, 3), activation='relu', padding='same', name='block3_conv3')(x)
x = MaxPooling2D((2, 2), strides=(2, 2), name='block3_pool')(x)
# Block 4
x = Conv2D(512, (3, 3), activation='relu', padding='same', name='block4_conv1')(x)
x = Conv2D(512, (3, 3), activation='relu', padding='same', name='block4_conv2')(x)
x = Conv2D(512, (3, 3), activation='relu', padding='same', name='block4_conv3')(x)
x = MaxPooling2D((2, 2), strides=(2, 2), name='block4_pool')(x)
# Block 5
x = Conv2D(512, (3, 3), activation='relu', padding='same', name='block5_conv1')(x)
x = Conv2D(512, (3, 3), activation='relu', padding='same', name='block5_conv2')(x)
x = Conv2D(512, (3, 3), activation='relu', padding='same', name='block5_conv3')(x)
# x = MaxPooling2D((2, 2), strides=(2, 2), name='block5_pool')(x)
return x
def _run_assertions_on_qdist(q_dist, inputs, input_dim, dist_dim, batch_size):
# assert isinstance(q_dist, (tfd.MultivariateNormalDiag, tfd.MultivariateNormalTriL))
assert K.is_keras_tensor(q_dist)
# Test in a model with a data tensor
model = tf.keras.Model(inputs=inputs, outputs=q_dist)
dummy_inputs = tf.random.uniform((batch_size, input_dim))
dummy_q = model(dummy_inputs)
assert isinstance(dummy_q,
(tfd.MultivariateNormalDiag, tfd.MultivariateNormalTriL))
assert dummy_q.stddev().shape.as_list() == [batch_size, dist_dim]
assert np.all(dummy_q.stddev().numpy() > 0)
assert dummy_q.sample().shape.as_list() == [batch_size, dist_dim]
assert ~np.any(np.isnan(dummy_q.sample().numpy()))
# Implied convert_to_tensor != mean
assert tf.not_equal(tf.add(dummy_q, 0), dummy_q.mean()).numpy().any()
def hilbert(x):
'''
Implements the hilbert transform.
Args:
x: The input sequence. A tensor of shape (None, channel, sample, filter)
Returns:
xc: A complex sequence of the same shape.
'''
if len(x.shape) != 4:
raise NotImplementedError
if x.dtype != 'float32':
x = tf.cast(x, dtype=tf.float32)
if K.is_keras_tensor(x):
if K.image_data_format() == 'channels_first':
filter_num = K.int_shape(input_tensor)[1]
channel = K.int_shape(input_tensor)[2]
N = K.int_shape(input_tensor)[3]
else:
channel = K.int_shape(input_tensor)[1]
N = K.int_shape(input_tensor)[2]
filter_num = K.int_shape(input_tensor)[3]
x = tf.transpose(x, [0, 1, 3, 2])
x = tf.reshape(x, [-1, channel * filter_num, N])
x = tf.complex(x, tf.zeros_like(x))
Xf = tf.signal.fft(x)
if N % 2 == 0:
part0 = tf.ones(1)
part1 = 2 * tf.ones(N // 2 - 1)
part2 = tf.ones(1)
part3 = tf.zeros(N // 2 - 1)
h = tf.concat([part0, part1, part2, part3], axis=0)
else:
part0 = tf.ones(1)
part1 = 2 * tf.ones((N + 1) // 2 - 1)
part2 = tf.zeros((N + 1) // 2 - 1)
h = tf.concat([part0, part1, part2], axis=0)
hs = tf.expand_dims(h, 0)
hs = tf.expand_dims(hs, 0)
tf_hc = tf.complex(hs, tf.zeros_like(hs))
xc = Xf * tf_hc
out = tf.signal.ifft(xc)
return tf.transpose(tf.reshape(out, [-1, channel, filter_num, N]),
[0, 1, 3, 2])
def test_jaccard_distance():
# all_right, almost_right, half_right, all_wrong
y_true = np.array([[0, 0, 1, 0], [0, 0, 1, 0], [0, 0, 1, 0],
[0, 0, 1., 0.]])
y_pred = np.array([[0, 0, 1, 0], [0, 0, 0.9, 0], [0, 0, 0.1, 0],
[1, 1, 0.1, 1.]])
r = jaccard_distance(
K.variable(y_true),
K.variable(y_pred),
)
if K.is_keras_tensor(r):
assert K.int_shape(r) == (4, )
all_right, almost_right, half_right, all_wrong = K.eval(r)
assert all_right == 0, 'should converge on zero'
assert all_right < almost_right
assert almost_right < half_right
assert half_right < all_wrong
def model_resnet50(input_tensor=None,
input_shape=None,
classes=1000,
include_top=True,
pooling=None,
weights=None,
data_format="channels_last"):
ch_axis = 3 if data_format == 'channels_last' else 1
input_shape = deduce_input_shape(input_shape,
require_flatten=include_top,
weights=weights,
data_format=data_format)
if input_tensor is not None:
if not backend.is_keras_tensor(input_tensor):
raise ValueError("input_tensor must be a Keras layer tensor.")
img_input = input_tensor
else:
img_input = layers.Input(shape=input_shape)
net = cnn_resnet50(img_input, ch_axis=ch_axis)
if include_top:
net = top_resnet(net, classes)
else:
# add global pooling if required
net = pool_resnet(net, pooling, data_format)
if input_tensor is not None:
inputs = utils.get_source_inputs(input_tensor)
else:
inputs = img_input
# Create model.
model = models.Model(inputs, net, name='resnet50')
if weights == 'imagenet':
resource = KERAS_TEAM['RESNET50']
resource = resource['WITH_TOP'] if include_top else resource['NO_TOP']
origin = resource.uri
resource_path = utils.get_file(resource.name,
origin,
cache_subdir="models",
file_hash=resource.file_hash)
model.load_weights(resource_path)
pass
elif weights is not None:
model.load_weights(weights)
return model
def model_vgg16(input_tensor=None,
input_shape=None,
classes=1000,
include_top=True,
pooling=None,
weights=None):
# provide a way to compute the default input shape
input_shape = deduce_input_shape(input_shape,
require_flatten=include_top,
weights=weights)
if input_tensor is not None:
if not backend.is_keras_tensor(input_tensor):
raise ValueError("input_tensor must be a Keras layer tensor.")
img_input = input_tensor
else:
img_input = layers.Input(shape=input_shape)
net = cnn_vgg16(img_input)
if include_top:
# add the top classification network
net = top_vgg(net, classes)
else:
# add global pooling if required
net = pool_cnn(net, pooling)
if input_tensor is not None:
inputs = utils.get_source_inputs(input_tensor)
else:
inputs = img_input
# Create model.
model = models.Model(inputs, net, name='vgg16')
if weights == 'imagenet':
resource = FCHOLLET['VGG16']
resource = resource['WITH_TOP'] if include_top else resource['NO_TOP']
origin = resource.uri
resource_path = utils.get_file(resource.name,
origin,
cache_subdir="models",
file_hash=resource.file_hash)
model.load_weights(resource_path)
elif weights is not None:
model.load_weights(weights)
return model
def featurenet_3D_backbone(input_tensor=None,
input_shape=None,
n_filters=32,
**kwargs):
"""Construct the deepcell backbone with five convolutional units
Args:
input_tensor (tensor): Input tensor to specify input size
n_filters (int): Number of filters for convolutional layers
Returns:
tuple: List of backbone layers, list of backbone names
"""
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
# Build out backbone
c1 = featurenet_3D_block(img_input, n_filters) # 1/2 64x64
c2 = featurenet_3D_block(c1, n_filters) # 1/4 32x32
c3 = featurenet_3D_block(c2, n_filters) # 1/8 16x16
c4 = featurenet_3D_block(c3, n_filters) # 1/16 8x8
c5 = featurenet_3D_block(c4, n_filters) # 1/32 4x4
backbone_features = [c1, c2, c3, c4, c5]
backbone_names = ['C1', 'C2', 'C3', 'C4', 'C5']
output_dict = {}
for name, feature in zip(backbone_names, backbone_features):
output_dict[name] = feature
if input_tensor is not None:
inputs = get_source_inputs(input_tensor)
else:
inputs = img_input
model = Model(inputs=inputs, outputs=backbone_features)
return model, output_dict
def ResNet50(input_tensor=None, input_shape=None):
model_name = 'resnet50'
if input_tensor is None:
img_input = layers.Input(shape=input_shape)
else:
if not backend.is_keras_tensor(input_tensor):
img_input = layers.Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
bn_axis = 3 if backend.image_data_format() == 'channels_last' else 1
x = layers.Conv2D(64, 7, strides=2, use_bias=False,
name='conv1_conv')(img_input)
x = layers.BatchNormalization(axis=bn_axis,
epsilon=1.001e-5,
name='conv1_bn')(x)
p0 = layers.Activation('relu', name='conv1_relu')(x)
x = layers.MaxPooling2D(3, strides=2, padding='SAME',
name='pool1_pool')(p0)
p1 = stack1(x, 64, 3, stride1=1, name='conv2')
p2 = stack1(p1, 128, 4, stride1=2, name='conv3')
p3 = stack1(p2, 256, 6, stride1=1, dilation=2, name='conv4')
p4 = stack1(p3, 512, 3, stride1=1, name='conv5')
x = p4
# Ensure that the model takes into account
# any potential predecessors of `input_tensor`.
if input_tensor is not None:
inputs = keras_utils.get_source_inputs(input_tensor)
else:
inputs = img_input
# Create model.
model = models.Model(inputs, x, name=model_name)
return model
def ResNet(stack_fn,
preact,
use_bias,
model_name='resnet',
include_top=True,
input_tensor=None,
input_shape=None,
pooling=None,
classes=1000,
**kwargs):
"""Instantiates the ResNet, ResNetV2, and ResNeXt architecture.
Optionally loads weights pre-trained on ImageNet.
Note that the data format convention used by the model is
the one specified in your Keras config at `~/.keras/keras.json`.
# Arguments
stack_fn: a function that returns output tensor for the
stacked residual blocks.
preact: whether to use pre-activation or not
(True for ResNetV2, False for ResNet and ResNeXt).
use_bias: whether to use biases for convolutional layers or not
(True for ResNet and ResNetV2, False for ResNeXt).
model_name: string, model name.
include_top: whether to include the fully-connected
layer at the top of the network.
input_tensor: optional Keras tensor
(i.e. output of `layers.Input()`)
to use as image input for the model.
input_shape: optional shape tuple, only to be specified
if `include_top` is False (otherwise the input shape
has to be `(224, 224, 3)` (with `channels_last` data format)
or `(3, 224, 224)` (with `channels_first` data format).
It should have exactly 3 inputs channels.
pooling: optional pooling mode for feature extraction
when `include_top` is `False`.
- `None` means that the output of the model will be
the 4D tensor output of the
last convolutional layer.
- `avg` means that global average pooling
will be applied to the output of the
last convolutional layer, and thus
the output of the model will be a 2D tensor.
- `max` means that global max pooling will
be applied.
classes: optional number of classes to classify images
into, only to be specified if `include_top` is True, and
if no `weights` argument is specified.
# Returns
A Keras model instance.
# Raises
ValueError: in case of invalid argument for `weights`,
or invalid input shape.
"""
if input_tensor is None:
img_input = layers.Input(shape=input_shape)
else:
if not backend.is_keras_tensor(input_tensor):
img_input = layers.Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
bn_axis = 3 if backend.image_data_format() == 'channels_last' else 1
x = layers.ZeroPadding3D(padding=3, name='conv1_pad')(img_input)
x = layers.Conv3D(64, 7, strides=2, use_bias=use_bias, name='conv1_conv')(x)
if preact is False:
x = layers.BatchNormalization(axis=bn_axis, epsilon=1.001e-5,
name='conv1_bn')(x)
x = layers.Activation('relu', name='conv1_relu')(x)
x = layers.ZeroPadding3D(padding=1, name='pool1_pad')(x)
x = layers.MaxPooling3D(3, strides=2, name='pool1_pool')(x)
x = stack_fn(x)
if preact is True:
x = layers.BatchNormalization(axis=bn_axis, epsilon=1.001e-5,
name='post_bn')(x)
x = layers.Activation('relu', name='post_relu')(x)
if include_top:
x = layers.GlobalAveragePooling3D(name='avg_pool')(x)
x = layers.Dense(classes, activation='softmax', name='probs')(x)
else:
if pooling == 'avg':
x = layers.GlobalAveragePooling3D(name='avg_pool')(x)
elif pooling == 'max':
x = layers.GlobalMaxPooling3D(name='max_pool')(x)
# Ensure that the model takes into account
# any potential predecessors of `input_tensor`.
if input_tensor is not None:
inputs = keras_utils.get_source_inputs(input_tensor)
else:
inputs = img_input
# Create model.
model = models.Model(inputs, x, name=model_name)
return model
def ResNet50(include_top=True, input_tensor=None, input_shape=None, pooling=None, classes=10, squeeze=False,
squeeze_type='normal', **kwargs):
"""Instantiates the ResNet50 architecture.
# Arguments
include_top: whether to include the fully-connected
layer at the top of the network.
input_tensor: optional Keras tensor (i.e. output of `layers.Input()`)
to use as image input for the model.
input_shape: optional shape tuple, only to be specified
if `include_top` is False (otherwise the input shape
has to be `(224, 224, 3)` (with `channels_last` data format)
or `(3, 224, 224)` (with `channels_first` data format).
It should have exactly 3 inputs channels,
and width and height should be no smaller than 32.
pooling: Optional pooling mode for feature extraction
when `include_top` is `False`.
- `None` means that the output of the model will be
the 4D tensor output of the
last convolutional block.
- `avg` means that global average pooling
will be applied to the output of the
last convolutional block, and thus
the output of the model will be a 2D tensor.
- `max` means that global max pooling will
be applied.
classes: optional number of classes to classify images
into, only to be specified if `include_top` is True, and
if no `weights` argument is specified.
# Returns
A Keras model instance.
# Raises
ValueError: in case of invalid argument for `weights`,
or invalid input shape.
"""
# global backend, layers, models, keras_utils
# backend, layers, models, keras_utils = get_submodules_from_kwargs(kwargs)
# Determine proper input shape
input_shape = (32, 32, 3)
if input_tensor is None:
img_input = layers.Input(shape=input_shape)
else:
if not K.is_keras_tensor(input_tensor):
img_input = layers.Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
# K.learning_phase()
if K.image_data_format() == 'channels_last':
bn_axis = 3
else:
bn_axis = 1
x = ZeroPadding2D(padding=(3, 3), name='conv1_pad')(img_input)
x = Conv2D(64, (7, 7), strides=(2, 2), padding='valid', kernel_initializer='he_normal', name='conv1')(x)
# x = BatchNormalization(axis=bn_axis, name='bn_conv1')(x, training = False)
x = BatchNormalization(axis=bn_axis, name='bn_conv1')(x)
x = Activation('relu')(x)
x = ZeroPadding2D(padding=(1, 1), name='pool1_pad')(x)
x = MaxPooling2D((3, 3), strides=(2, 2))(x)
# conv_block(input_tensor, kernel_size, filters, stage, block, strides=(2, 2)):
x = conv_block(x, 3, [64, 64, 256], stage=2, block='a', strides=(1, 1), squeeze=squeeze, squeeze_type=squeeze_type)
x = identity_block(x, 3, [64, 64, 256], stage=2, block='b', squeeze=squeeze, squeeze_type=squeeze_type)
x = identity_block(x, 3, [64, 64, 256], stage=2, block='c', squeeze=squeeze, squeeze_type=squeeze_type)
x = conv_block(x, 3, [128, 128, 512], stage=3, block='a', squeeze=squeeze, squeeze_type=squeeze_type)
x = identity_block(x, 3, [128, 128, 512], stage=3, block='b', squeeze=squeeze, squeeze_type=squeeze_type)
x = identity_block(x, 3, [128, 128, 512], stage=3, block='c', squeeze=squeeze, squeeze_type=squeeze_type)
x = identity_block(x, 3, [128, 128, 512], stage=3, block='d', squeeze=squeeze, squeeze_type=squeeze_type)
x = conv_block(x, 3, [256, 256, 1024], stage=4, block='a', squeeze=squeeze, squeeze_type=squeeze_type)
x = identity_block(x, 3, [256, 256, 1024], stage=4, block='b', squeeze=squeeze, squeeze_type=squeeze_type)
x = identity_block(x, 3, [256, 256, 1024], stage=4, block='c', squeeze=squeeze, squeeze_type=squeeze_type)
x = identity_block(x, 3, [256, 256, 1024], stage=4, block='d', squeeze=squeeze, squeeze_type=squeeze_type)
x = identity_block(x, 3, [256, 256, 1024], stage=4, block='e', squeeze=squeeze, squeeze_type=squeeze_type)
x = identity_block(x, 3, [256, 256, 1024], stage=4, block='f', squeeze=squeeze, squeeze_type=squeeze_type)
x = conv_block(x, 3, [512, 512, 2048], stage=5, block='a', squeeze=squeeze, squeeze_type=squeeze_type)
x = identity_block(x, 3, [512, 512, 2048], stage=5, block='b', squeeze=squeeze, squeeze_type=squeeze_type)
x = identity_block(x, 3, [512, 512, 2048], stage=5, block='c', squeeze=squeeze, squeeze_type=squeeze_type)
# Output shape: (1, 1, depth)
# x = AveragePooling2D((7, 7), name='avg_pool')(x)
# print("Output shape :")
# print(x.get_shape())
if include_top:
x = Flatten()(x)
# print("After flatten ")
# print(x.get_shape())
x = Dense(classes, activation='softmax', name='fc1000')(x)
# print("After Dense ")
# print(x.get_shape())
else:
if pooling == 'avg':
x = GlobalAveragePooling2D()(x)
elif pooling == 'max':
x = GlobalMaxPooling2D()(x)
# Ensure that the model takes into account
# any potential predecessors of `input_tensor`.
if input_tensor is not None:
inputs = get_source_inputs(input_tensor)
else:
inputs = img_input
# Create model.
model = Model(inputs, x, name='resnet50')
return model
def SEDenseNet(input_shape=None,
depth=40,
nb_dense_block=3,
growth_rate=12,
nb_filter=-1,
nb_layers_per_block=-1,
bottleneck=False,
reduction=0.0,
dropout_rate=0.0,
weight_decay=1e-4,
subsample_initial_block=False,
include_top=True,
weights=None,
input_tensor=None,
classes=10,
activation='softmax'):
"""Instantiate the SE DenseNet architecture
# Arguments
input_shape: optional shape tuple, only to be specified
if `include_top` is False (otherwise the input shape
has to be `(32, 32, 3)` (with `channels_last` dim ordering)
or `(3, 32, 32)` (with `channels_first` dim ordering).
It should have exactly 3 inputs channels,
and width and height should be no smaller than 8.
E.g. `(200, 200, 3)` would be one valid value.
depth: number or layers in the DenseNet
nb_dense_block: number of dense blocks to add to end (generally = 3)
growth_rate: number of filters to add per dense block
nb_filter: initial number of filters. -1 indicates initial
number of filters is 2 * growth_rate
nb_layers_per_block: number of layers in each dense block.
Can be a -1, positive integer or a list.
If -1, calculates nb_layer_per_block from the network depth.
If positive integer, a set number of layers per dense block.
If list, nb_layer is used as provided. Note that list size must
be (nb_dense_block + 1)
bottleneck: flag to add bottleneck blocks in between dense blocks
reduction: reduction factor of transition blocks.
Note : reduction value is inverted to compute compression.
dropout_rate: dropout rate
weight_decay: weight decay rate
subsample_initial_block: Set to True to subsample the initial convolution and
add a MaxPool2D before the dense blocks are added.
include_top: whether to include the fully-connected
layer at the top of the network.
weights: one of `None` (random initialization) or
'imagenet' (pre-training on ImageNet)..
input_tensor: optional Keras tensor (i.e. output of `layers.Input()`)
to use as image input for the model.
classes: optional number of classes to classify images
into, only to be specified if `include_top` is True, and
if no `weights` argument is specified.
activation: Type of activation at the top layer. Can be one of 'softmax' or 'sigmoid'.
Note that if sigmoid is used, classes must be 1.
# Returns
A Keras model instance.
"""
if weights not in {'imagenet', None}:
raise ValueError('The `weights` argument should be either '
'`None` (random initialization) or `cifar10` '
'(pre-training on CIFAR-10).')
if weights == 'imagenet' and include_top and classes != 1000:
raise ValueError('If using `weights` as ImageNet with `include_top`'
' as true, `classes` should be 1000')
if activation not in ['softmax', 'sigmoid']:
raise ValueError('activation must be one of "softmax" or "sigmoid"')
if activation == 'sigmoid' and classes != 1:
raise ValueError(
'sigmoid activation can only be used when classes = 1')
# Determine proper input shape
input_shape = _obtain_input_shape(input_shape,
default_size=32,
min_size=8,
data_format=K.image_data_format(),
require_flatten=include_top)
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
x = __create_dense_net(classes, img_input, include_top, depth,
nb_dense_block, growth_rate, nb_filter,
nb_layers_per_block, bottleneck, reduction,
dropout_rate, weight_decay, subsample_initial_block,
activation)
# Ensure that the model takes into account
# any potential predecessors of `input_tensor`.
if input_tensor is not None:
inputs = get_source_inputs(input_tensor)
else:
inputs = img_input
# Create model.
model = Model(inputs, x, name='se-densenet')
return model
def QuantizedResNet50FusedBN(include_top=True,
weights='imagenet',
input_tensor=None,
input_shape=None,
pooling=None,
classes=1000,
batch_size=None,
nbits=24,
fbits=9,
rounding_method='nearest',
quant_mode='hybrid',
overflow_mode=False,
stop_gradient=False,
verbose=True):
"""Instantiates the ResNet50 architecture.
Optionally loads weights pre-trained on ImageNet.
Note that the data format convention used by the model is
the one specified in your Keras config at `~/.keras/keras.json`.
# Arguments
include_top: whether to include the fully-connected
layer at the top of the network.
weights: one of `None` (random initialization),
'imagenet' (pre-training on ImageNet),
or the path to the weights file to be loaded.
input_tensor: optional Keras tensor (i.e. output of `layers.Input()`)
to use as image input for the model.
input_shape: optional shape tuple, only to be specified
if `include_top` is False (otherwise the input shape
has to be `(224, 224, 3)` (with `channels_last` data format)
or `(3, 224, 224)` (with `channels_first` data format).
It should have exactly 3 inputs channels,
and width and height should be no smaller than 197.
E.g. `(200, 200, 3)` would be one valid value.
pooling: Optional pooling mode for feature extraction
when `include_top` is `False`.
- `None` means that the output of the model will be
the 4D tensor output of the
last convolutional layer.
- `avg` means that global average pooling
will be applied to the output of the
last convolutional layer, and thus
the output of the model will be a 2D tensor.
- `max` means that global max pooling will
be applied.
classes: optional number of classes to classify images
into, only to be specified if `include_top` is True, and
if no `weights` argument is specified.
# Returns
A Keras model instance.
# Raises
ValueError: in case of invalid argument for `weights`,
or invalid input shape.
"""
if verbose:
print('\nBuilding model : Quantized ResNet50')
pbar=tqdm(total=19)
layer_quantizer=build_layer_quantizer(nbits,fbits,rounding_method,overflow_mode,stop_gradient)
if verbose:
pbar.set_postfix_str('Preparation')
pbar.update()
if not os.path.exists(weights):
raise ValueError('The `weights` argument must be the path to the weights file to be loaded. File not found!')
if weights == 'imagenet' and include_top and classes != 1000:
raise ValueError('If using `weights` as imagenet with `include_top`'
' as true, `classes` should be 1000')
# Determine proper input shape
input_shape = _obtain_input_shape(input_shape,
default_size=224,
min_size=197,
data_format=backend.image_data_format(),
require_flatten=include_top,
weights=weights)
if input_tensor is None:
img_input = layers.Input(batch_shape=(batch_size,)+input_shape)
else:
if not backend.is_keras_tensor(input_tensor):
img_input = layers.Input(tensor=input_tensor, batch_shape=(batch_size,)+input_shape)
else:
img_input = input_tensor
if verbose:
pbar.set_postfix_str('building stage 1')
x = layers.ZeroPadding2D(padding=(3, 3), name='conv1_pad')(img_input)
x = QuantizedConv2D(64,
kernel_size=(7, 7),
strides=(2, 2),
padding='valid',
quantizers=layer_quantizer,
name='conv1',
quant_mode=quant_mode)(x)
x = layers.Activation('relu')(x)
x = layers.MaxPooling2D((3, 3), strides=(2, 2))(x)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 2 block a')
x = conv_block_fused_BN(x, 3, [64, 64, 256], stage=2, block='a', strides=(1, 1),
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 2 block b')
x = identity_block_fused_BN(x, 3, [64, 64, 256], stage=2, block='b',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 2 block c')
x = identity_block_fused_BN(x, 3, [64, 64, 256], stage=2, block='c',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 3 block a')
x = conv_block_fused_BN(x, 3, [128, 128, 512], stage=3, block='a',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 3 block b')
x = identity_block_fused_BN(x, 3, [128, 128, 512], stage=3, block='b',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 3 block c')
x = identity_block_fused_BN(x, 3, [128, 128, 512], stage=3, block='c',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 3 block d')
x = identity_block_fused_BN(x, 3, [128, 128, 512], stage=3, block='d',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 4 block a')
x = conv_block_fused_BN(x, 3, [256, 256, 1024], stage=4, block='a',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 3 block b')
x = identity_block_fused_BN(x, 3, [256, 256, 1024], stage=4, block='b',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 3 block c')
x = identity_block_fused_BN(x, 3, [256, 256, 1024], stage=4, block='c',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 3 block d')
x = identity_block_fused_BN(x, 3, [256, 256, 1024], stage=4, block='d',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 3 block e')
x = identity_block_fused_BN(x, 3, [256, 256, 1024], stage=4, block='e',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 3 block f')
x = identity_block_fused_BN(x, 3, [256, 256, 1024], stage=4, block='f',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 5 block a')
x = conv_block_fused_BN(x, 3, [512, 512, 2048], stage=5, block='a',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 5 block b')
x = identity_block_fused_BN(x, 3, [512, 512, 2048], stage=5, block='b',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building stage 5 block c')
x = identity_block_fused_BN(x, 3, [512, 512, 2048], stage=5, block='c',
layer_quantizer=layer_quantizer,
quant_mode=quant_mode)
if verbose:
pbar.update()
pbar.set_postfix_str('building output block')
if include_top:
x = layers.AveragePooling2D((7, 7), name='avg_pool')(x)
x = QuantizedFlatten()(x)
x = QuantizedDense(classes, activation='softmax', name='fc1000',
quantizers=layer_quantizer,
quant_mode=quant_mode,
last_layer=True)(x)
else:
if pooling == 'avg':
x = layers.GlobalAveragePooling2D()(x)
elif pooling == 'max':
x = layers.GlobalMaxPooling2D()(x)
else:
warnings.warn('The output shape of `ResNet50(include_top=False)` '
'has been changed since Keras 2.2.0.')
if verbose:
pbar.update()
# Ensure that the model takes into account
# any potential predecessors of `input_tensor`.
if input_tensor is not None:
inputs = backend.get_source_inputs(input_tensor)
else:
inputs = img_input
# Create model.
model = models.Model(inputs, x, name='quantized_resnet50_fusedBN')
if verbose:
pbar.set_postfix_str('Model Built')
pbar.close()
# load weights
if weights is not None:
model.load_weights(weights)
return model
def RESNET50(include_top=True,
weights='vggface',
input_tensor=None,
input_shape=None,
pooling=None,
classes=8631):
input_shape = _obtain_input_shape(input_shape,
default_size=224,
min_size=32,
data_format=K.image_data_format(),
require_flatten=include_top,
weights=weights)
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not K.is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
if K.image_data_format() == 'channels_last':
bn_axis = 3
else:
bn_axis = 1
x = Conv2D(64, (7, 7),
use_bias=False,
strides=(2, 2),
padding='same',
name='conv1/7x7_s2')(img_input)
x = BatchNormalization(axis=bn_axis, name='conv1/7x7_s2/bn')(x)
x = Activation('relu')(x)
x = MaxPooling2D((3, 3), strides=(2, 2))(x)
x = resnet_conv_block(x,
3, [64, 64, 256],
stage=2,
block=1,
strides=(1, 1))
x = resnet_identity_block(x, 3, [64, 64, 256], stage=2, block=2)
x = resnet_identity_block(x, 3, [64, 64, 256], stage=2, block=3)
x = resnet_conv_block(x, 3, [128, 128, 512], stage=3, block=1)
x = resnet_identity_block(x, 3, [128, 128, 512], stage=3, block=2)
x = resnet_identity_block(x, 3, [128, 128, 512], stage=3, block=3)
x = resnet_identity_block(x, 3, [128, 128, 512], stage=3, block=4)
x = resnet_conv_block(x, 3, [256, 256, 1024], stage=4, block=1)
x = resnet_identity_block(x, 3, [256, 256, 1024], stage=4, block=2)
x = resnet_identity_block(x, 3, [256, 256, 1024], stage=4, block=3)
x = resnet_identity_block(x, 3, [256, 256, 1024], stage=4, block=4)
x = resnet_identity_block(x, 3, [256, 256, 1024], stage=4, block=5)
x = resnet_identity_block(x, 3, [256, 256, 1024], stage=4, block=6)
x = resnet_conv_block(x, 3, [512, 512, 2048], stage=5, block=1)
x = resnet_identity_block(x, 3, [512, 512, 2048], stage=5, block=2)
x = resnet_identity_block(x, 3, [512, 512, 2048], stage=5, block=3)
x = AveragePooling2D((7, 7), name='avg_pool')(x)
if include_top:
x = Flatten()(x)
x = Dense(classes, activation='softmax', name='classifier')(x)
else:
if pooling == 'avg':
x = GlobalAveragePooling2D()(x)
elif pooling == 'max':
x = GlobalMaxPooling2D()(x)
# Ensure that the model takes into account
# any potential predecessors of `input_tensor`.
if input_tensor is not None:
inputs = get_source_inputs(input_tensor)
else:
inputs = img_input
# Create model.
model = Model(inputs, x, name='vggface_resnet50')
# load weights
if weights == 'vggface':
# if include_top:
# weights_path = get_file('rcmalli_vggface_tf_resnet50.h5',
# utils.RESNET50_WEIGHTS_PATH,
# cache_subdir=utils.VGGFACE_DIR)
# else:
# weights_path = get_file('rcmalli_vggface_tf_notop_resnet50.h5',
# utils.RESNET50_WEIGHTS_PATH_NO_TOP,
# cache_subdir=utils.VGGFACE_DIR)
weights_path = os.path.join(WEIGHTS_DIR,
'rcmalli_vggface_tf_notop_resnet50.h5')
model.load_weights(weights_path)
# if K.backend() == 'theano':
# layer_utils.convert_all_kernels_in_model(model)
# if include_top:
# maxpool = model.get_layer(name='avg_pool')
# shape = maxpool.output_shape[1:]
# dense = model.get_layer(name='classifier')
# layer_utils.convert_dense_weights_data_format(dense, shape,
# 'channels_first')
if K.image_data_format() == 'channels_first' and K.backend(
) == 'tensorflow':
warnings.warn('You are using the TensorFlow backend, yet you '
'are using the Theano '
'image data format convention '
'(`image_data_format="channels_first"`). '
'For best performance, set '
'`image_data_format="channels_last"` in '
'your Keras config '
'at ~/.keras/keras.json.')
elif weights is not None:
model.load_weights(weights)
return model
def __DenseNet121(nb_dense_block=4, growth_rate=32, nb_filter=64, reduction=0.5, dropout_rate=0.0,
weight_decay=1e-4, load_weights=True, include_top=False, input_tensor=None,
pooling='avg', input_shape=(224, 224, 3), classes=1000):
'''Instantiate the DenseNet 121 architecture,
# Arguments
nb_dense_block: number of dense blocks to add to end
growth_rate: number of filters to add per dense block
nb_filter: initial number of filters
reduction: reduction factor of transition blocks.
dropout_rate: dropout rate
weight_decay: weight decay factor
classes: optional number of classes to classify images
weights_path: path to pre-trained weights
# Returns
A Keras model instance.
'''
eps = 1.1e-5
# compute compression factor
compression = 1.0 - reduction
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not K.is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
# endif
# endif
# Handle Dimension Ordering for different backends
global concat_axis
if K.image_data_format() == 'channels_last':
concat_axis = 3
else:
concat_axis = 1
# endif
# From architecture for ImageNet (Table 1 in the paper)
nb_filter = 64
nb_layers = [6,12,24,16] # For DenseNet-121
# Initial convolution
x = ZeroPadding2D((3, 3), name='conv1_zeropadding')(img_input)
x = Convolution2D(nb_filter, kernel_size=(7, 7), strides=(2, 2), name='conv1', use_bias=False)(x)
x = BatchNormalization(epsilon=eps, axis=concat_axis, name='conv1_bn')(x)
x = Scale(axis=concat_axis, name='conv1_scale')(x)
x = Activation('relu', name='relu1')(x)
x = ZeroPadding2D((1, 1), name='pool1_zeropadding')(x)
x = MaxPooling2D((3, 3), strides=(2, 2), name='pool1')(x)
# Add dense blocks
for block_idx in range(nb_dense_block - 1):
stage = block_idx+2
x, nb_filter = dense_block(x, stage, nb_layers[block_idx], nb_filter, growth_rate, dropout_rate=dropout_rate, weight_decay=weight_decay)
# Add transition_block
x = transition_block(x, stage, nb_filter, compression=compression, dropout_rate=dropout_rate, weight_decay=weight_decay)
nb_filter = int(nb_filter * compression)
# endfor
final_stage = stage + 1
x, nb_filter = dense_block(x, final_stage, nb_layers[-1], nb_filter, growth_rate, dropout_rate=dropout_rate, weight_decay=weight_decay)
x = BatchNormalization(epsilon=eps, axis=concat_axis, name='conv'+str(final_stage)+'_blk_bn')(x)
x = Scale(axis=concat_axis, name='conv'+str(final_stage)+'_blk_scale')(x)
x = Activation('relu', name='relu'+str(final_stage)+'_blk')(x)
if include_top:
x = GlobalAveragePooling2D(name='pool'+str(final_stage))(x)
else:
if pooling == 'avg':
x = GlobalAveragePooling2D(name='pool'+str(final_stage))(x)
elif pooling == 'max':
x = GlobalMaxPooling2D(name='pool'+str(final_stage))(x)
# endif
# endif
fc_ll = x
x = Dense(classes, name='fc6')(x)
x = Activation('softmax', name='prob')(x)
model = Model(img_input, x, name='densenet121')
if load_weights:
weights_path = get_file('densenet121_weights_tf.h5', DENSENET_121_WEIGHTS_PATH, cache_subdir='models')
model.load_weights(weights_path)
# endif
if include_top == False:
model = Model(img_input, fc_ll)
# endif
return model
def nn_base(width_coefficient,
depth_divisor,
input_tensor=None,
trainable=False,
dropout_rate=0.2,
drop_connect_rate=0.2):
# open json contaning information about blocks
with open('./block_args.json', 'r') as f:
blocks_json = json.load(f)
# determine input shape. As the code will only support
# tensorflow backend, there is only one option for input
# shape
input_shape = (None, None, 3
) # 3 because the model will receive RGB images
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not K.is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
# because the backend is tensorflow,
# K.image_dim_ordering() == 'tf
bn_axis = 3
# get swish activation function
activation = get_swish()
# build stem
x = Conv2D(round_filters(32, width_coefficient, depth_divisor),
3,
padding='same',
use_bias=False,
kernel_initializer=CONV_KERNEL_INITIALIZER,
name='stem_conv')(img_input)
x = BatchNormalization(axis=bn_axis, name='stem_bn')(x)
x = Activation(activation, name='stem_activation')(x)
# build blocks
total_num_blocks = sum(blocks_json[block]['num_repeat']
for block in blocks_json)
block_num = 0
# go through every big block defined in block_args.json
for idx, block in enumerate(blocks_json):
# transform this specific block in an object
block = Struct(**blocks_json[block])
# ensure num_repeat is bigger than zero
assert block.num_repeat > 0
# update block input and output filters based on depth multiplier.
block.input_filters = round_filters(block.input_filters,
width_coefficient, depth_divisor)
# the first block needs to take care of stride and filter size increase.
drop_rate = drop_connect_rate * float(block_num) / total_num_blocks
x = mb_conv_block(block,
drop_rate=drop_rate,
activation=activation,
prefix='block{}a_'.format(idx + 1))(x)
block_num += 1
if block.num_repeat > 1:
block.input_filters = block.output_filters
block.strides = [1, 1]
for bidx in range(block.num_repeat - 1):
drop_rate = drop_connect_rate * float(
block_num) / total_num_blocks
block_prefix = 'block{}{}_'.format(
idx + 1, string.ascii_lowercase[bidx + 1])
x = mb_conv_block(block,
prefix=block_prefix,
drop_rate=drop_rate,
activation=activation)
block_num += 1
# build top
x = Conv2D(round_filters(1280, width_coefficient, depth_divisor),
1,
padding='same',
use_bias=False,
kernel_initializer=CONV_KERNEL_INITIALIZER,
name='top_conv')(x)
x = BatchNormalization(axis=bn_axis, name='top_bn')(x)
x = Activation(activation, name='top_activation')(x)
return x
def EfficientNet(input_shape, block_args_list, global_params, input_tensor=None, include_top=True, pooling=None):
batch_norm_momentum = global_params.batch_norm_momentum
batch_norm_epsilon = global_params.batch_norm_epsilon
if global_params.data_format == 'channels_first':
channel_axis = 1
else:
channel_axis = -1
# Stem part
# Stem part
if input_tensor is None:
inputs = KL.Input(shape=input_shape)
else:
if not K.is_keras_tensor(input_tensor):
inputs = KL.Input(tensor=input_tensor, shape=input_shape)
else:
inputs = input_tensor
x = inputs
x = KL.Conv2D(
filters=round_filters(32, global_params),
kernel_size=[3, 3],
strides=[2, 2],
kernel_initializer=conv_kernel_initializer,
padding='same',
use_bias=False
)(x)
x = KL.BatchNormalization(
axis=channel_axis,
momentum=batch_norm_momentum,
epsilon=batch_norm_epsilon
)(x)
x = Swish()(x)
# Blocks part
block_idx = 1
n_blocks = sum([block_args.num_repeat for block_args in block_args_list])
drop_rate = global_params.drop_connect_rate or 0
drop_rate_dx = drop_rate / n_blocks
for block_args in block_args_list:
assert block_args.num_repeat > 0
# Update block input and output filters based on depth multiplier.
block_args = block_args._replace(
input_filters=round_filters(block_args.input_filters, global_params),
output_filters=round_filters(block_args.output_filters, global_params),
num_repeat=round_repeats(block_args.num_repeat, global_params)
)
# The first block needs to take care of stride and filter size increase.
x = MBConvBlock(block_args, global_params,
drop_connect_rate=drop_rate_dx * block_idx)(x)
block_idx += 1
if block_args.num_repeat > 1:
block_args = block_args._replace(input_filters=block_args.output_filters, strides=[1, 1])
for _ in xrange(block_args.num_repeat - 1):
x = MBConvBlock(block_args, global_params,
drop_connect_rate=drop_rate_dx * block_idx)(x)
block_idx += 1
# Head part
x = KL.Conv2D(
filters=round_filters(1280, global_params),
kernel_size=[1, 1],
strides=[1, 1],
kernel_initializer=conv_kernel_initializer,
padding='same',
use_bias=False
)(x)
x = KL.BatchNormalization(
axis=channel_axis,
momentum=batch_norm_momentum,
epsilon=batch_norm_epsilon
)(x)
x = Swish()(x)
if include_top:
x = KL.GlobalAveragePooling2D(data_format=global_params.data_format)(x)
if global_params.dropout_rate > 0:
x = KL.Dropout(global_params.dropout_rate)(x)
x = KL.Dense(global_params.num_classes, kernel_initializer=dense_kernel_initializer)(x)
x = KL.Activation('softmax')(x)
else:
if pooling == 'avg':
x = KL.GlobalAveragePooling2D(data_format=global_params.data_format)(x)
elif pooling == 'max':
x = KL.GlobalMaxPooling2D(data_format=global_params.data_format)(x)
outputs = x
model = KM.Model(inputs, outputs)
return model
def build_resnet(repetitions=(2, 2, 2, 2),
include_top=True,
input_tensor=None,
input_shape=None,
classes=1000,
block_type='usual',
name=None):
"""
TODO
"""
# Determine proper input shape
input_shape = _obtain_input_shape(input_shape,
default_size=224,
min_size=197,
data_format='channels_last',
require_flatten=include_top)
if input_tensor is None:
img_input = Input(shape=input_shape, name='data')
else:
if not K.is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
# get parameters for model layers
no_scale_bn_params = get_bn_params(scale=False)
bn_params = get_bn_params()
conv_params = get_conv_params()
init_filters = 64
if block_type == 'basic':
conv_block = basic_conv_block
identity_block = basic_identity_block
else:
conv_block = usual_conv_block
identity_block = usual_identity_block
# resnet bottom
x = BatchNormalization(name='bn_data', **no_scale_bn_params)(img_input)
x = ZeroPadding2D(padding=(3, 3))(x)
x = Conv2D(init_filters, (7, 7),
strides=(2, 2),
name='conv0',
**conv_params)(x)
x = BatchNormalization(name='bn0', **bn_params)(x)
x = Activation('relu', name='relu0')(x)
x = ZeroPadding2D(padding=(1, 1))(x)
x = MaxPooling2D((3, 3), strides=(2, 2), padding='valid',
name='pooling0')(x)
# resnet body
for stage, rep in enumerate(repetitions):
for block in range(rep):
filters = init_filters * (2**stage)
# first block of first stage without strides because we have maxpooling before
if block == 0 and stage == 0:
x = conv_block(filters, stage, block, strides=(1, 1))(x)
elif block == 0:
x = conv_block(filters, stage, block, strides=(2, 2))(x)
else:
x = identity_block(filters, stage, block)(x)
x = BatchNormalization(name='bn1', **bn_params)(x)
x = Activation('relu', name='relu1')(x)
# resnet top
if include_top:
x = GlobalAveragePooling2D(name='pool1')(x)
x = Dense(classes, name='fc1')(x)
x = Activation('softmax', name='softmax')(x)
# Ensure that the model takes into account any potential predecessors of `input_tensor`.
if input_tensor is not None:
inputs = get_source_inputs(input_tensor)
else:
inputs = img_input
# Create model.
model = Model(inputs, x, name=name)
return model
def SEResNet(input_shape=None,
initial_conv_filters=64,
depth=[3, 4, 6, 3],
filters=[64, 128, 256, 512],
width=1,
bottleneck=False,
weight_decay=1e-4,
include_top=True,
weights=None,
input_tensor=None,
pooling=None,
classes=1000):
""" Instantiate the Squeeze and Excite ResNet architecture. Note that ,
when using TensorFlow for best performance you should set
`image_data_format="channels_last"` in your Keras config
at ~/.keras/keras.json.
The model are compatible with both
TensorFlow and Theano. The dimension ordering
convention used by the model is the one
specified in your Keras config file.
# Arguments
initial_conv_filters: number of features for the initial convolution
depth: number or layers in the each block, defined as a list.
ResNet-50 = [3, 4, 6, 3]
ResNet-101 = [3, 6, 23, 3]
ResNet-152 = [3, 8, 36, 3]
filter: number of filters per block, defined as a list.
filters = [64, 128, 256, 512
width: width multiplier for the network (for Wide ResNets)
bottleneck: adds a bottleneck conv to reduce computation
weight_decay: weight decay (l2 norm)
include_top: whether to include the fully-connected
layer at the top of the network.
weights: `None` (random initialization) or `imagenet` (trained
on ImageNet)
input_tensor: optional Keras tensor (i.e. output of `layers.Input()`)
to use as image input for the model.
input_shape: optional shape tuple, only to be specified
if `include_top` is False (otherwise the input shape
has to be `(224, 224, 3)` (with `tf` dim ordering)
or `(3, 224, 224)` (with `th` dim ordering).
It should have exactly 3 inputs channels,
and width and height should be no smaller than 8.
E.g. `(200, 200, 3)` would be one valid value.
pooling: Optional pooling mode for feature extraction
when `include_top` is `False`.
- `None` means that the output of the model will be
the 4D tensor output of the
last convolutional layer.
- `avg` means that global average pooling
will be applied to the output of the
last convolutional layer, and thus
the output of the model will be a 2D tensor.
- `max` means that global max pooling will
be applied.
classes: optional number of classes to classify images
into, only to be specified if `include_top` is True, and
if no `weights` argument is specified.
# Returns
A Keras model instance.
"""
if weights not in {'imagenet', None}:
raise ValueError('The `weights` argument should be either '
'`None` (random initialization) or `imagenet` '
'(pre-training on ImageNet).')
if weights == 'imagenet' and include_top and classes != 1000:
raise ValueError('If using `weights` as imagenet with `include_top`'
' as true, `classes` should be 1000')
assert len(depth) == len(filters), "The length of filter increment list must match the length " \
"of the depth list."
# Determine proper input shape
input_shape = _obtain_input_shape(input_shape,
default_size=224,
min_size=32,
data_format=K.image_data_format(),
require_flatten=False)
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
x = _create_se_resnet(classes, img_input, include_top, initial_conv_filters,
filters, depth, width, bottleneck, weight_decay, pooling)
# Ensure that the model takes into account
# any potential predecessors of `input_tensor`.
if input_tensor is not None:
inputs = get_source_inputs(input_tensor)
else:
inputs = img_input
# Create model.
model = Model(inputs, x, name='resnext')
# load weights
return model
