def focused_rnns(arg1_ids):
"""One RNN decides focus weights for other RNNs."""
# embed arg1 input sequence
arg1_emb = shared_emb(arg1_ids)
# shape: (sample, arg1_len, words_dim)
# focus weights for all RNNs
focus_weights = GRU(focus_dim, return_sequences=True, dropout_U=focus_dropout_U, dropout_W=focus_dropout_W)(arg1_emb)
# shape: (sample, arg1_len, focus_dim)
# individual RNNs with focus
rnns = []
for i in range(focus_dim):
# focus weights for current RNN
select_repeat = Lambda(lambda x: K.repeat_elements(x[:, i], words_dim, axis=-1), output_shape=lambda s: s[:1] + (words_dim,))
rnn_focus = TimeDistributed(select_repeat)(focus_weights)
# shape: (samples, arg1_len, words_dim)
# weighted input sequence
rnn_in = merge([arg1_emb, rnn_focus], mode='mul')
# shape: (samples, arg1_len, words_dim)
# individual RNN
rnn = GRU(rnn_dim, return_sequences=False, dropout_U=rnn_dropout_U, dropout_W=rnn_dropout_W)(rnn_in)
rnns.append(rnn)
# shape: (samples, rnn_dim)
return rnns
def build_variational_architecture(self):
e1 = Convolution2D(64,
6,
6,
subsample=(2, 2),
activation='relu',
border_mode='valid',
name='e1')(self.autoencoder_input)
e3 = Convolution2D(64,
6,
6,
subsample=(2, 2),
activation='relu',
border_mode='same',
name='e3')(e1)
e4 = Convolution2D(64,
6,
6,
subsample=(2, 2),
activation='relu',
border_mode='same',
name='e4')(e3)
e5 = Dense(512, activation='relu')(flatten(e4))
self.z_mean = Dense(self.latent_shape, activation='linear')(e5)
self.z_log_sigma = Dense(self.latent_shape, activation='linear')(e5)
batch_size = tf.shape(self.autoencoder_input)[0]
def sample_z(args):
z_m, z_l_s = args
eps = K.random_normal(shape=(batch_size, self.latent_shape),
mean=0.,
std=1.)
return z_m + K.exp(z_l_s / 2) * eps
# Sample z
z = Lambda(sample_z)([self.z_mean, self.z_log_sigma])
# Decoder layers
d1 = Dense(6400, activation='relu', name='d1')
d2 = Reshape((10, 10, 64), name='d2')
d3 = Deconvolution2D(64,
6,
6,
output_shape=(None, 20, 20, 64),
subsample=(2, 2),
activation='relu',
border_mode='same',
name='d3')
d4 = Deconvolution2D(64,
6,
6,
output_shape=(None, 40, 40, 64),
subsample=(2, 2),
activation='relu',
border_mode='same',
name='d4')
d5 = Deconvolution2D(1,
6,
6,
output_shape=(None, 84, 84, 1),
subsample=(2, 2),
activation='sigmoid',
border_mode='valid',
name='d5')
# Full autoencoder
d1_full = d1(z)
d2_full = d2(d1_full)
d3_full = d3(d2_full)
d4_full = d4(d3_full)
d5_full = d5(d4_full)
d7_full = Reshape((7056, ))(d5_full)
# Only decoding
d1_decoder = d1(self.decoder_input)
d2_decoder = d2(d1_decoder)
d3_decoder = d3(d2_decoder)
d4_decoder = d4(d3_decoder)
d5_decoder = d5(d4_decoder)
d7_decoder = Reshape((7056, ))(d5_decoder)
self.decoder_output = d7_decoder
self.autoencoder_output = d7_full
self.encoder_output = self.z_mean
self.emulator_reconstruction_loss = K.sum(K.binary_crossentropy(
self.autoencoder_output, flatten(self.autoencoder_input)),
axis=1)
kl_loss = -0.5 * K.sum(1 + self.z_log_sigma - K.square(self.z_mean) -
K.exp(self.z_log_sigma),
axis=-1)
self.autoencoder_loss = tf.add(self.emulator_reconstruction_loss,
kl_loss)
def cos_distance(y_true, y_pred):
y_true = K.l2_normalize(y_true, axis=-1)
y_pred = K.l2_normalize(y_pred, axis=-1)
return K.mean(1 - K.sum((y_true * y_pred), axis=-1))
fr_model = build_fr_model(input_shape=fr_image_shape)
fr_model.compile(loss=['binary_crossentropy'], optimizer="adam")
# Make the face recognition network as non-trainable
fr_model.trainable = False
# Input layers
input_image = Input(shape=(64, 64, 3))
input_label = Input(shape=(6,))
# Use the encoder and the generator network
latent0 = encoder(input_image)
gen_images = generator([latent0, input_label])
# Resize images to the desired shape
resized_images = Lambda(lambda x: K.resize_images(gen_images, height_factor=3, width_factor=3,
data_format='channels_last'))(gen_images)
embeddings = fr_model(resized_images)
# Create a Keras model and specify the inputs and outputs for the network
fr_adversarial_model = Model(inputs=[input_image, input_label], outputs=[embeddings])
# Compile the model
fr_adversarial_model.compile(loss=euclidean_distance_loss, optimizer=adversarial_optimizer)
for epoch in range(epochs):
print("Epoch:", epoch)
reconstruction_losses = []
number_of_batches = int(len(loaded_images) / batch_size)
print("Number of batches:", number_of_batches)
def call(self, x, mask=None):
eij = K.tanh(K.dot(x, self.W) + self.b)
ai = K.exp(eij)
weights = ai / K.sum(ai, axis=1).dimshuffle(0, 'x')
weighted_input = x * weights.dimshuffle(0, 1, 'x')
return weighted_input.sum(axis=1)
def bottleneck_encoder(self,
tensor,
nfilters,
downsampling=False,
dilated=False,
asymmetric=False,
normal=False,
drate=0.1,
name=''):
"""
Encoder
:param tensor: input tensor
:param nfilters: Number of filters
:param downsampling: Downsample the feature map
:param dilated: determines if ther should be dilated convultion
:param asymmetric: Determines if there should be asymmetric convolution
:param normal: enables 3x3 convolution on feature map
:param drate: rate of dilation
:param name: the name for the weight variable.
:return: encoder output
"""
y = tensor
skip = tensor
stride = 1
ksize = 1
# Filters operating on downsampled images have a bigger receptive field and hence gathers more context.
if downsampling:
stride = 2
ksize = 2
skip = MaxPooling2D(pool_size=(2, 2),
name=f'max_pool_{name}')(skip)
skip = Permute(
(1, 3, 2),
name=f'permute_1_{name}')(skip) # (B, H, W, C) -> (B, H, C, W)
ch_pad = nfilters - K.int_shape(tensor)[-1]
skip = ZeroPadding2D(padding=((0, 0), (0, ch_pad)),
name=f'zeropadding_{name}')(skip)
skip = Permute(
(1, 3, 2),
name=f'permute_2_{name}')(skip) # (B, H, C, W) -> (B, H, W, C)
y = Conv2D(filters=nfilters // 4,
kernel_size=(ksize, ksize),
kernel_initializer='he_normal',
strides=(stride, stride),
padding='same',
use_bias=False,
name=f'1x1_conv_{name}')(y)
y = BatchNormalization(momentum=0.1, name=f'bn_1x1_{name}')(y)
y = PReLU(shared_axes=[1, 2], name=f'prelu_1x1_{name}')(y)
if normal:
# deconv with 3x3 filter
y = Conv2D(filters=nfilters // 4,
kernel_size=(3, 3),
kernel_initializer='he_normal',
padding='same',
name=f'3x3_conv_{name}')(y)
elif asymmetric:
# decompose 5x5 convolution to two asymmetric layers as 5x1 and 1x5
y = Conv2D(filters=nfilters // 4,
kernel_size=(5, 1),
kernel_initializer='he_normal',
padding='same',
use_bias=False,
name=f'5x1_conv_{name}')(y)
y = Conv2D(filters=nfilters // 4,
kernel_size=(1, 5),
kernel_initializer='he_normal',
padding='same',
name=f'1x5_conv_{name}')(y)
elif dilated:
y = Conv2D(filters=nfilters // 4,
kernel_size=(3, 3),
kernel_initializer='he_normal',
dilation_rate=(dilated, dilated),
padding='same',
name=f'dilated_conv_{name}')(y)
y = BatchNormalization(momentum=0.1, name=f'bn_main_{name}')(y)
y = PReLU(shared_axes=[1, 2], name=f'prelu_{name}')(y)
y = Conv2D(filters=nfilters,
kernel_size=(1, 1),
kernel_initializer='he_normal',
use_bias=False,
name=f'final_1x1_{name}')(y)
y = BatchNormalization(momentum=0.1, name=f'bn_final_{name}')(y)
y = SpatialDropout2D(rate=drate,
name=f'spatial_dropout_final_{name}')(y)
y = Add(name=f'add_{name}')([y, skip])
y = PReLU(shared_axes=[1, 2], name=f'prelu_out_{name}')(y)
return y
def dropped_inputs():
return K.dropout(ones, self.recurrent_dropout)
def call(self, inputs, **kwargs):
return K.sum(inputs, axis=1)
def binary_accuracy(y_true, y_pred):
return K.mean(K.equal(y_true, K.round(y_pred)), axis=-1)
#to many more layers, this will keep our code
#read-able
import os, sys
local_path = os.path.dirname(__file__)
root = os.path.join(local_path, '..', "..")
sys.path.append(root)
from keras import backend as K
import tensorflow as tf
config = tf.ConfigProto(intra_op_parallelism_threads=30, \
inter_op_parallelism_threads=30, \
allow_soft_placement=True, \
device_count = {'CPU': 30})
session = tf.Session(config=config)
K.set_session(session)
def bias_variable(shape, name):
initial = tf.constant(0.1, shape=shape)
return tf.Variable(initial, name=name)
def conv2d(x, W):
return tf.nn.conv2d(x, W, strides=[1, 1, 1, 1], padding='SAME')
def max_pool_2x2(x):
return tf.nn.max_pool(x,
ksize=[1, 2, 2, 1],
strides=[1, 2, 2, 1],
def Sum(x):
return K.sum(x, axis=1)
def __call__(self, w):
return K.clip(w, 0., 1.)
def broadcast_pose(self, pose, height, width):
pose = Reshape((1, 1, 2))(pose)
pose = Lambda(lambda pose: K.tile(pose, [1, height, width, 1]))(pose)
return pose
def learn_cnn(x_train, y_train, x_test, y_test):
num_classes = 10
# input image dimensions
img_rows, img_cols = 28, 28
if K.image_data_format() == 'channels_first':
x_train = x_train.reshape(x_train.shape[0], 1, img_rows, img_cols)
x_test = x_test.reshape(x_test.shape[0], 1, img_rows, img_cols)
input_shape = (1, img_rows, img_cols)
else:
x_train = x_train.reshape(x_train.shape[0], img_rows, img_cols, 1)
x_test = x_test.reshape(x_test.shape[0], img_rows, img_cols, 1)
input_shape = (img_rows, img_cols, 1)
x_train = x_train.astype('float32')
x_test = x_test.astype('float32')
x_train /= 255
x_test /= 255
y_train = keras.utils.to_categorical(y_train, num_classes)
y_test = keras.utils.to_categorical(y_test, num_classes)
model = Sequential()
model.add(
Conv2D(32,
kernel_size=(3, 3),
activation='relu',
input_shape=input_shape))
model.add(Conv2D(64, (3, 3), activation='relu'))
model.add(MaxPooling2D(pool_size=(2, 2)))
model.add(Dropout(0.25))
model.add(Flatten())
model.add(Dense(128, activation='relu'))
model.add(Dropout(0.5))
model.add(Dense(10, activation='softmax'))
model.compile(loss=keras.losses.categorical_crossentropy,
optimizer=keras.optimizers.sgd(),
metrics=['acc'])
plot_model(model, to_file='cnn_model.png')
m = model.fit(x_train,
y_train,
validation_data=(x_test, y_test),
epochs=10,
batch_size=64,
verbose=2)
plt.plot(m.history['acc'])
plt.plot(m.history['val_acc'])
plt.title('learn cnn MNIST accuracy')
plt.ylabel('Accuracy')
plt.xlabel('Epoch')
plt.legend(['Train', 'Test'], loc='upper left')
plt.savefig("learn_cnn_MNIST_accuracy.png")
plt.show()
plt.plot(m.history['loss'])
plt.plot(m.history['val_loss'])
plt.title('learn cnn MNIST loss')
plt.ylabel('Loss')
plt.xlabel('Epoch')
plt.legend(['Train', 'Test'], loc='upper left')
plt.savefig("learn_cnn_MNIST_loss.png")
plt.show()
def binary_accuracy(y_true, y_pred):
return K.mean(K.equal(y_true, K.round(y_pred)), axis=-1)
multi_channel.append(model_word2vec_input)
multi_channel_embedding = merge(multi_channel, mode="concat", concat_axis=1)
conv1_output = cnn_model([multi_channel_embedding, multi_channel_embedding, multi_channel_embedding])
full_connected_layers = Dense(output_dim=len(label_to_index), init="glorot_uniform", activation="relu")(
conv1_output
)
dropout_layers = Dropout(p=0.5)(full_connected_layers)
softmax_output = Activation("softmax")(dropout_layers)
model = Model(input=[model_onehot_input, model_word2vec_input], output=[softmax_output])
model_output = K.function([model_onehot_input, model_word2vec_input, K.learning_phase()], [softmax_output])
if verbose > 1:
print model.summary()
# sgd = SGD(lr=0.1, decay=1e-6, momentum=0.9, nesterov=True)
logging.debug("开始训练...")
print "开始训练..."
model.compile(loss="categorical_crossentropy", optimizer="adadelta", metrics=["accuracy"])
logging.debug("开始训练，迭代次数：%s" % (config["cnn_nb_epoch"]))
logging.debug("开始训练，EarlyStopping的patience为：%d次" % (config["earlyStoping_patience"]))
early_stop = EarlyStopping(patience=config["earlyStoping_patience"], verbose=1)
# print train_data_features.shape[2]
model.fit(
def sampling(args):
z_mean, z_log_var = args
epsilon = K.random_normal(shape=(latent_dim, ), mean=0., std=epsilon_std)
return z_mean + K.exp(z_log_var / 2) * epsilon
def dropped_inputs():
return K.dropout(ones, self.dropout)
def vae_loss(x, x_decoded_mean):
xent_loss = input_dim * objectives.binary_crossentropy(x, x_decoded_mean)
kl_loss = -0.5 * K.sum(1 + z_log_var - K.square(z_mean) - K.exp(z_log_var),
axis=-1)
return xent_loss + kl_loss
def step(self, inputs, states):
h_tm1 = states[0]
c_tm1 = states[1]
dp_mask = states[2]
rec_dp_mask = states[3]
x_input = states[4]
# alignment model
h_att = K.repeat(h_tm1, self.timestep_dim)
att = _time_distributed_dense(x_input,
self.attention_weights,
self.attention_bias,
output_dim=K.int_shape(
self.attention_weights)[1])
attention_ = self.attention_activation(
K.dot(h_att, self.attention_recurrent_weights) + att)
attention_ = K.squeeze(
K.dot(attention_, self.attention_recurrent_bias), 2)
alpha = K.exp(attention_)
if dp_mask is not None:
alpha *= dp_mask[0]
alpha /= K.sum(alpha, axis=1, keepdims=True)
alpha_r = K.repeat(alpha, self.input_dim)
alpha_r = K.permute_dimensions(alpha_r, (0, 2, 1))
# make context vector (soft attention after Bahdanau et al.)
z_hat = x_input * alpha_r
context_sequence = z_hat
z_hat = K.sum(z_hat, axis=1)
if self.implementation == 2:
z = K.dot(inputs * dp_mask[0], self.kernel)
z += K.dot(h_tm1 * rec_dp_mask[0], self.recurrent_kernel)
z += K.dot(z_hat, self.attention_kernel)
if self.use_bias:
z = K.bias_add(z, self.bias)
z0 = z[:, :self.units]
z1 = z[:, self.units:2 * self.units]
z2 = z[:, 2 * self.units:3 * self.units]
z3 = z[:, 3 * self.units:]
i = self.recurrent_activation(z0)
f = self.recurrent_activation(z1)
c = f * c_tm1 + i * self.activation(z2)
o = self.recurrent_activation(z3)
else:
if self.implementation == 0:
x_i = inputs[:, :self.units]
x_f = inputs[:, self.units:2 * self.units]
x_c = inputs[:, 2 * self.units:3 * self.units]
x_o = inputs[:, 3 * self.units:]
elif self.implementation == 1:
x_i = K.dot(inputs * dp_mask[0], self.kernel_i) + self.bias_i
x_f = K.dot(inputs * dp_mask[1], self.kernel_f) + self.bias_f
x_c = K.dot(inputs * dp_mask[2], self.kernel_c) + self.bias_c
x_o = K.dot(inputs * dp_mask[3], self.kernel_o) + self.bias_o
else:
raise ValueError('Unknown `implementation` mode.')
i = self.recurrent_activation(
x_i + K.dot(h_tm1 * rec_dp_mask[0], self.recurrent_kernel_i) +
K.dot(z_hat, self.attention_i))
f = self.recurrent_activation(
x_f + K.dot(h_tm1 * rec_dp_mask[1], self.recurrent_kernel_f) +
K.dot(z_hat, self.attention_f))
c = f * c_tm1 + i * self.activation(
x_c + K.dot(h_tm1 * rec_dp_mask[2], self.recurrent_kernel_c) +
K.dot(z_hat, self.attention_c))
o = self.recurrent_activation(
x_o + K.dot(h_tm1 * rec_dp_mask[3], self.recurrent_kernel_o) +
K.dot(z_hat, self.attention_o))
h = o * self.activation(c)
if 0 < self.dropout + self.recurrent_dropout:
h._uses_learning_phase = True
if self.return_attention:
return context_sequence, [h, c]
else:
return h, [h, c]
def train(self,
epochs,
batch_size=32,
sample_interval=50,
save_interval=1500):
# # Load the dataset
# (X_train, _), (_, _) = mnist.load_data()
loss = []
# Load the images
X_train = self.load_images()
# image_size = X_train.shape[1]
# original_dim = image_size * image_size
# Normalize
X_train = X_train / 255
# Reshape
# X_train = X_train.reshape((len(X_train), np.prod(X_train.shape[1:])))
# VAE loss = mse_loss or xent_loss + kl_loss
reconstruction_loss = K.mean(mse(self.inputs, self.outputs))
reconstruction_loss *= self.img_rows * self.img_cols
# reconstruction_loss = np.mean(reconstruction_loss, axis=(1, 2))
kl_loss = 1 + self.z_log_var - K.square(self.z_mean) - K.exp(
self.z_log_var)
kl_loss = K.sum(kl_loss, axis=-1)
kl_loss *= -0.5
print(reconstruction_loss.shape, kl_loss.shape)
vae_loss = K.mean(reconstruction_loss + kl_loss)
self.vae.add_loss(vae_loss)
self.vae.compile(optimizer='adam')
self.vae.summary()
# plot_model(self.vae,
# to_file='vae_mlp.png',
# show_shapes=True)
try:
for i in range(1, int(epochs / sample_interval) + 1):
print("True Epoch: " + str(i * sample_interval))
# train the autoencoder
history = self.vae.fit(
X_train,
shuffle=True,
epochs=int(epochs / sample_interval),
batch_size=batch_size,
validation_data=(X_train, None)) # TODO: make test
self.vae.save_weights('vae_mlp_fruit.h5')
self.sample_images(X_train, i * sample_interval, noise=False)
self.sample_images(X_train, i * sample_interval)
loss.append(history.history['loss'])
except KeyboardInterrupt:
pass
loss = np.stack(loss).flatten()
history_file = open("histories/%d-history.pkl" % time.time(), "wb")
pickle.dump(history, history_file)
plt.clf()
plt.plot(loss, label="loss")
plt.legend()
plt.title(label='VAE-GAN Loss')
plt.savefig("images/plots/%d-vae-gan_loss.png" % time.time())
plt.show()
def smoothL1(y_true, y_pred):
x = K.abs(y_true - y_pred)
x = tf.where(x < HUBER_DELTA, 0.5 * x**2,
HUBER_DELTA * (x - 0.5 * HUBER_DELTA))
return K.sum(x)
def sampleLoss(true_y, pred_y):
z_mean = tf.expand_dims(pred_y[:, :, :, :, 0], -1)
z_log_sigma = tf.expand_dims(pred_y[:, :, :, :, 1], -1)
return -0.5 * K.mean(
1 + z_log_sigma - K.square(z_mean) - K.exp(z_log_sigma), axis=-1)
def generateAvgFromVolumes(vol_center, volumes, model):
session = tf.Session()
model_config = {
'batchsize': 1,
'split': 0.9,
'validation': 0.1,
'half_res': True,
'epochs': 200,
'groupnorm': True,
'GN_groups': 32,
'atlas': 'atlas.nii.gz',
'model_output': 'model.pkl',
'exponentialSteps': 7,
}
atlas, itk_atlas = DataGenerator.loadAtlas(model_config)
m = DiffeomorphicRegistrationNet.create_model(model_config)
m.load_weights(model)
shapes = atlas.squeeze().shape
print("First is : {}".format(vol_center))
vol_first = vol_center
np_vol_center = readNormalizedVolumeByPath(vol_first, itk_atlas).reshape(
1, *shapes).astype(np.float32)
velocities = []
for vol in volumes:
#np_atlas = atlas.reshape(1,*shapes).astype(np.float32)
np_vol = readNormalizedVolumeByPath(vol, itk_atlas).reshape(
1, *shapes).astype(np.float32)
np_stack = np.empty(1 * shapes[0] * shapes[1] * shapes[2] * 2,
dtype=np.float32).reshape(1, *shapes, 2)
np_stack[:, :, :, :, 0] = np_vol
np_stack[:, :, :, :, 1] = np_vol_center
#tf_stack = tf.convert_to_tensor(np_stack)
predictions = m.predict(np_stack)
velocity = predictions[2][0, :, :, :, :]
velocities.append(velocity)
# compute avg velocities
avg_velocity = np.zeros(
int(1 * shapes[0] / 2 * shapes[1] / 2 * shapes[2] / 2 * 3),
dtype=np.float32).reshape(1, *[int(s / 2) for s in shapes], 3)
for v in velocities:
avg_velocity += v
avg_velocity /= float(len(velocities))
# apply squaring&scaling
steps = model_config['exponentialSteps']
tf_velo = tf.convert_to_tensor(
avg_velocity.reshape(1, *[int(s / 2) for s in shapes], 3))
tf_vol_center = tf.convert_to_tensor(np_vol_center.reshape(1, *shapes, 1))
x, y, z = K.int_shape(tf_velo)[1:4]
# clip too large values:
v_max = 0.5 * (2**steps)
v_min = -v_max
velo = tf.clip_by_value(tf_velo, v_min, v_max)
# ij indexing doesn't change (x,y,z) to (y,x,z)
grid = tf.expand_dims(
tf.stack(
tf.meshgrid(tf.linspace(0., x - 1., x),
tf.linspace(0., y - 1., y),
tf.linspace(0., z - 1., z),
indexing='ij'), -1), 0)
# replicate along batch size
stacked_grids = tf.tile(grid, (tf.shape(velo)[0], 1, 1, 1, 1))
displacement = tfVectorFieldExpHalf(velo, stacked_grids, n_steps=steps)
displacement_highres = toUpscaleResampled(displacement)
# warp center volume
new_warped = remap3d(tf_vol_center, displacement_highres)
with session.as_default():
new_volume = new_warped.eval(session=session).reshape(*shapes)
vol_dirs = np.array(itk_atlas.GetDirection()).reshape(3, 3)
# reapply directions
warp_np = np.flip(new_volume,
[a for a in range(3) if vol_dirs[a, a] == -1.])
# prepare axes swap from xyz to zyx
warp_np = np.transpose(warp_np, (2, 1, 0))
# write image
warp_img = sitk.GetImageFromArray(warp_np)
warp_img.SetOrigin(itk_atlas.GetOrigin())
warp_img.SetDirection(itk_atlas.GetDirection())
sitk.WriteImage(warp_img, "new_volume.nii.gz")
def call(self, inputs, **kwargs):
return K.sqrt(K.sum(K.square(inputs), -1))
def expand_label_input(x):
x = K.expand_dims(x, axis=1)
x = K.expand_dims(x, axis=1)
x = K.tile(x, [1, 32, 32, 1])
return x
def call(self, x, mask=None):
features_dim = self.features_dim
step_dim = self.step_dim
eij = K.reshape(K.dot(K.reshape(x, (-1, features_dim)),
K.reshape(self.W, (features_dim, 1))), (-1, step_dim))
if self.bias:
eij += self.b
eij = K.tanh(eij)
a = K.exp(eij)
if mask is not None:
a *= K.cast(mask, K.floatx())
a /= K.cast(K.sum(a, axis=1, keepdims=True) + K.epsilon(), K.floatx())
a = K.expand_dims(a)
weighted_input = x * a
return K.sum(weighted_input, axis=1)
def call(self, u_vecs):
if self.share_weights:
u_hat_vecs = K.conv1d(u_vecs, self.W)
else:
u_hat_vecs = K.local_conv1d(u_vecs, self.W, [1], [1])
batch_size = K.shape(u_vecs)[0]
input_num_capsule = K.shape(u_vecs)[1]
u_hat_vecs = K.reshape(u_hat_vecs,
(batch_size, input_num_capsule,
self.num_capsule, self.dim_capsule))
u_hat_vecs = K.permute_dimensions(u_hat_vecs, (0, 2, 1, 3))
# final u_hat_vecs.shape = [None, num_capsule, input_num_capsule, dim_capsule]
b = K.zeros_like(
u_hat_vecs[:, :, :,
0]) # shape = [None, num_capsule, input_num_capsule]
for i in range(self.routings):
b = K.permute_dimensions(
b, (0, 2, 1)) # shape = [None, input_num_capsule, num_capsule]
c = K.softmax(b)
c = K.permute_dimensions(c, (0, 2, 1))
b = K.permute_dimensions(b, (0, 2, 1))
outputs = self.activation(K.batch_dot(c, u_hat_vecs, [2, 2]))
if i < self.routings - 1:
b = K.batch_dot(outputs, u_hat_vecs, [2, 3])
return outputs
def hdnn_(input_shape=(140, 140, 3),
input_tensor=None,
weights=None,
activation_fn='tanh',
init='glorot_uniform',
l1=0.01,
l2=0.01,
dropout=0.5):
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 = conv2d_block(input_tensor=img_input,
nb_filter=84,
kernel_size=(7, 7),
stage=1,
block=1,
activation_fn=activation_fn,
stride=(1, 1),
init=init,
l1=l1,
l2=l2)
x = conv2d_block(input_tensor=x,
nb_filter=84,
kernel_size=(4, 4),
stage=2,
block=1,
activation_fn=activation_fn,
stride=(1, 1),
init=init,
l1=l1,
l2=l2)
x = conv2d_block(input_tensor=x,
nb_filter=54,
kernel_size=(4, 4),
stage=3,
block=1,
activation_fn=activation_fn,
pool_size=(3, 3),
stride=(1, 1),
init=init,
l1=l1,
l2=l2)
# Hybrid block parameters
hybrid_block_params = dict(n_blocks=3,
input_tensor=x,
input_shape=(14, 14, 54),
nb_filters=[54, 20, 10],
kernel_sizes=[(4, 4), (4, 4), (6, 6)],
stage=3,
activation_fns=activation_fn,
strides=(2, 2),
pool_sizes=[(2, 2), (2, 2), (1, 1)])
# x = hybrid_conv2d_block(**hybrid_block_params)
#
# x = Flatten()(x)
# x = Dense(1024, activation=activation_fn)(x)
# x = Dense(1024, activation=activation_fn)(x)
# x = Dense(1024, activation=activation_fn)(x)
# x = Dense(output_dim=2, activation=activation_fn)(x)
# x = Activation('softmax')(x)
model = Model(input=img_input, output=x, name='hdnn')
if weights is not None:
# TODO Handling pre-trained model
pass
return model
#to many more layers, this will keep our code
#read-able
import os, sys
local_path = os.path.dirname(__file__)
root = os.path.join(local_path, '..', "..")
sys.path.append(root)
from keras import backend as K
import tensorflow as tf
config = tf.ConfigProto(intra_op_parallelism_threads=30, \
inter_op_parallelism_threads=30, \
allow_soft_placement=True, \
device_count = {'CPU': 30})
session = tf.Session(config=config)
K.set_session(session)
def bias_variable(shape, name):
initial = tf.constant(0.1, shape=shape)
return tf.Variable(initial, name = name)
def conv2d(x, W):
return tf.nn.conv2d(x, W, strides=[1, 1, 1, 1], padding='SAME')
def max_pool_2x2(x):
return tf.nn.max_pool(x, ksize=[1, 2, 2, 1],
strides=[1, 2, 2, 1], padding='SAME')
class cnn(BaseClassifier):
def __init__(self, batch_size = 100, nb_epoch=256, num_filt_1 = 16, num_filt_2 = 14, num_fc_1 = 40, verbose = 1):
model = Sequential()
self.classifier = model
self.batch_size = batch_size
def euclidean_distance_loss(y_true, y_pred):
return K.sqrt(K.sum(K.square(y_pred - y_true), axis=-1))
# print cnn_model.summary()
model_input = Input(shape=(1,input_length,word_embedding_length))
conv1_output = cnn_model([model_input,model_input,model_input])
full_connected_layers = Dense(output_dim=len(label_to_index), init="glorot_uniform",activation='relu')(conv1_output)
dropout_layers = Dropout(p=0.5)(full_connected_layers)
softmax_output = Activation("softmax")(dropout_layers)
model = Model(input=[model_input], output=[softmax_output])
model_output = K.function([model_input, K.learning_phase()],
[softmax_output])
if verbose > 1:
print model.summary()
# sgd = SGD(lr=0.1, decay=1e-6, momentum=0.9, nesterov=True)
logging.debug('开始训练...')
print '开始训练...'
model.compile(loss='categorical_crossentropy', optimizer='adadelta', metrics=['accuracy'])
logging.debug('开始训练，迭代次数：%s' % (config['cnn_nb_epoch']))
logging.debug('开始训练，EarlyStopping的patience为：%d次' % (config['earlyStoping_patience']))
early_stop = EarlyStopping(patience=config['earlyStoping_patience'], verbose=1)
# print train_data_features.shape[2]
def _time_distributed_dense(x,
w,
b=None,
dropout=None,
input_dim=None,
output_dim=None,
timesteps=None,
training=None):
"""Apply `y . w + b` for every temporal slice y of x.
# Arguments
x: input tensor.
w: weight matrix.
b: optional bias vector.
dropout: wether to apply dropout (same dropout mask
for every temporal slice of the input).
input_dim: integer; optional dimensionality of the input.
output_dim: integer; optional dimensionality of the output.
timesteps: integer; optional number of timesteps.
training: training phase tensor or boolean.
# Returns
Output tensor.
"""
if not input_dim:
input_dim = K.shape(x)[2]
if not timesteps:
timesteps = K.shape(x)[1]
if not output_dim:
output_dim = K.int_shape(w)[1]
if dropout is not None and 0. < dropout < 1.:
# apply the same dropout pattern at every timestep
ones = K.ones_like(K.reshape(x[:, 0, :], (-1, input_dim)))
dropout_matrix = K.dropout(ones, dropout)
expanded_dropout_matrix = K.repeat(dropout_matrix, timesteps)
x = K.in_train_phase(x * expanded_dropout_matrix, x, training=training)
# collapse time dimension and batch dimension together
x = K.reshape(x, (-1, input_dim))
x = K.dot(x, w)
if b is not None:
x = K.bias_add(x, b)
# reshape to 3D tensor
if K.backend() == 'tensorflow':
x = K.reshape(x, K.stack([-1, timesteps, output_dim]))
x.set_shape([None, None, output_dim])
else:
x = K.reshape(x, (-1, timesteps, output_dim))
return x
def get_constants(self, inputs, training=None):
constants = []
if self.implementation != 0 and 0 < self.dropout < 1:
input_shape = K.int_shape(inputs)
input_dim = input_shape[-1]
ones = K.ones_like(K.reshape(inputs[:, 0, 0], (-1, 1)))
ones = K.tile(ones, (1, int(input_dim)))
def dropped_inputs():
return K.dropout(ones, self.dropout)
dp_mask = [
K.in_train_phase(dropped_inputs, ones, training=training)
for _ in range(4)
]
constants.append(dp_mask)
else:
constants.append([K.cast_to_floatx(1.) for _ in range(4)])
if 0 < self.recurrent_dropout < 1:
ones = K.ones_like(K.reshape(inputs[:, 0, 0], (-1, 1)))
ones = K.tile(ones, (1, self.units))
def dropped_inputs():
return K.dropout(ones, self.recurrent_dropout)
rec_dp_mask = [
K.in_train_phase(dropped_inputs, ones, training=training)
for _ in range(4)
]
constants.append(rec_dp_mask)
else:
constants.append([K.cast_to_floatx(1.) for _ in range(4)])
# append the input as well for use later
constants.append(inputs)
return constants
def dot_product(x, kernel):
if K.backend() == 'tensorflow':
return K.squeeze(K.dot(x, K.expand_dims(kernel)), axis=-1)
else:
return K.dot(x, kernel)