np.random.shuffle(shuffled_indices)
train_idxs = shuffled_indices[:int(m * TRAIN_PER)]
dev_idxs = shuffled_indices[(int(m * TRAIN_PER)):(int(m * TRAIN_PER) +
int(m * DEV_PER))]
test_idxs = shuffled_indices[(int(m * TRAIN_PER) + int(m * DEV_PER)):]
X_v_train, X_nv_train, Y_train = X_v[train_idxs, :, :, :], X_nv[
train_idxs, :], Y[train_idxs, WHICH_Y]
X_v_dev, X_nv_dev, Y_dev = X_v[dev_idxs, :, :, :], X_nv[dev_idxs, :], Y[
dev_idxs, WHICH_Y]
X_v_test, X_nv_test, Y_test = X_v[test_idxs, :, :, :], X_nv[test_idxs, :], Y[
test_idxs, WHICH_Y]
## MODEL SETUP + TRAINING
input_v = layers.Input(shape=(230, 119, 3), name='video')
input_s = layers.Input(shape=(92, ), name='situation')
# Specify base model
img_shape = (230, 119, 3)
base_model = tf.keras.applications.vgg19.VGG19(input_shape=img_shape,
include_top=False,
weights='imagenet')
# Over the hyperparameters
for i in range(hp_grid.shape[0]):
EPOCHS = int(hp_grid[i, 0])
LEARNING_RATE = float(hp_grid[i, 1])
MINI_BATCH = int(hp_grid[i, 2])
NUM_UNITS = int(hp_grid[i, 3])
def inceptionV1(num_classes, batch_size=None):
"""Instantiates the GoogLeNet architecture.
Arguments:
num_classes: `int` number of classes for image classification.
batch_size: Size of the batches for each step.
Returns:
A Keras model instance.
"""
input_shape = (224, 224, 3)
img_input = layers.Input(shape=input_shape, batch_size=batch_size)
x = img_input
if backend.image_data_format() == 'channels_first':
x = layers.Permute((3, 1, 2))(x)
bn_axis = 1
else: # channels_last
bn_axis = -1
# stage1
x = layers.Conv2D(filters=64,
kernel_size=(7, 7),
strides=(2, 2),
padding='same',
kernel_initializer='he_normal',
kernel_regularizer=regularizers.l2(L2_WEIGHT_DECAY),
name='stage1_conv7x7')(x)
x = layers.BatchNormalization(axis=bn_axis, name='stage1_bn7x7')(x)
x = layers.Activation('relu')(x)
x = layers.MaxPool2D(pool_size=(3, 3), strides=(2, 2), padding='same')(x)
# stage2
x = layers.Conv2D(filters=64,
kernel_size=(1, 1),
strides=(1, 1),
padding='same',
kernel_initializer='he_normal',
kernel_regularizer=regularizers.l2(L2_WEIGHT_DECAY),
name='stage2_conv3x3_reduce')(x)
x = layers.BatchNormalization(axis=bn_axis, name='stage2_bn3x3_reduce')(x)
x = layers.Activation('relu')(x)
x = layers.Conv2D(filters=192,
kernel_size=(3, 3),
strides=(1, 1),
padding='same',
kernel_initializer='he_normal',
kernel_regularizer=regularizers.l2(L2_WEIGHT_DECAY),
name='stage2_conv3x3')(x)
x = layers.BatchNormalization(axis=bn_axis, name='stage2_bn3x3')(x)
x = layers.Activation('relu')(x)
x = layers.MaxPool2D(pool_size=(3, 3), strides=(2, 2), padding='same')(x)
# stage3a
x = inception_block(input_tensor=x,
num1x1=64,
num3x3_reduce=96,
num3x3=128,
num5x5_reduce=16,
num5x5=32,
pool_reduce=32,
stage=3,
block='a')
# stage3b
x = inception_block(input_tensor=x,
num1x1=128,
num3x3_reduce=128,
num3x3=192,
num5x5_reduce=32,
num5x5=96,
pool_reduce=64,
stage=3,
block='b')
x = layers.MaxPool2D(pool_size=(3, 3), strides=(2, 2), padding='same')(x)
# stage4a
x = inception_block(input_tensor=x,
num1x1=192,
num3x3_reduce=96,
num3x3=208,
num5x5_reduce=16,
num5x5=48,
pool_reduce=64,
stage=4,
block='a')
# stage4b
x = inception_block(input_tensor=x,
num1x1=160,
num3x3_reduce=112,
num3x3=224,
num5x5_reduce=24,
num5x5=64,
pool_reduce=64,
stage=4,
block='b')
# stage4c
x = inception_block(input_tensor=x,
num1x1=128,
num3x3_reduce=128,
num3x3=256,
num5x5_reduce=24,
num5x5=64,
pool_reduce=64,
stage=4,
block='c')
# stage4d
x = inception_block(input_tensor=x,
num1x1=112,
num3x3_reduce=144,
num3x3=288,
num5x5_reduce=32,
num5x5=64,
pool_reduce=64,
stage=4,
block='d')
# stage4e
x = inception_block(input_tensor=x,
num1x1=256,
num3x3_reduce=160,
num3x3=320,
num5x5_reduce=32,
num5x5=128,
pool_reduce=128,
stage=4,
block='e')
x = layers.MaxPool2D(pool_size=(3, 3), strides=(2, 2), padding='same')(x)
# stage5a
x = inception_block(input_tensor=x,
num1x1=256,
num3x3_reduce=160,
num3x3=320,
num5x5_reduce=32,
num5x5=128,
pool_reduce=128,
stage=5,
block='a')
# stage5b
x = inception_block(input_tensor=x,
num1x1=384,
num3x3_reduce=192,
num3x3=384,
num5x5_reduce=48,
num5x5=128,
pool_reduce=128,
stage=5,
block='b')
# classifier
x = layers.GlobalAveragePooling2D()(x)
x = layers.Dropout(rate=0.4)(x)
x = layers.Dense(units=num_classes,
kernel_initializer='he_normal',
kernel_regularizer=regularizers.l2(L2_WEIGHT_DECAY),
name='fc1000')(x)
# A softmax that is followed by the model loss must be done cannot be done
# in float16 due to numeric issues. So we pass dtype=float32.
x = layers.Activation('softmax', dtype='float32')(x)
# Create model.
return models.Model(img_input, x, name='googlenet')
#!/usr/bin/env python
import tensorflow as tf
from tensorflow.keras import layers, models, regularizers, callbacks
IN_SIZE = 256
INNER_SIZE = 1024
OUT_SIZE = 102
SAMPLES = 36
CHUNK_SIZE = 4
BATCH_SIZE = 1
EPOCHS = 1
in_l = layers.Input(shape=(CHUNK_SIZE, IN_SIZE), batch_size=BATCH_SIZE)
l = in_l
l = layers.SimpleRNN(INNER_SIZE, return_sequences=True, stateful=True, activation='softmax')(l) # , kernel_regularizer=regularizers.l1(1e-4)
l = layers.TimeDistributed(layers.Dense(OUT_SIZE, activation='softmax'))(l)
out_l = l
model = models.Model(in_l, out_l)
model.summary()
model.compile(optimizer='adam', loss='sparse_categorical_crossentropy', metrics=['sparse_categorical_accuracy'])
def chunks(l, n):
"""Yield successive n-sized chunks from l."""
l = list(l)
for i in range(0, len(l), n):
yield l[i:i + n]
def _ds_gen0():
files = open('files.txt', 'r').readline().strip().split(' ')
inputs = [[ord(c) for c in open(fn, 'r').read()] for fn in files]
# Reduce training ROIs per image because the images are small and have
# few objects. Aim to allow ROI sampling to pick 33% positive ROIs.
TRAIN_ROIS_PER_IMAGE = 32
# Use a small epoch since the data is simple
STEPS_PER_EPOCH = 100
# use small validation steps since the epoch is small
VALIDATION_STEPS = 5
config = ShapesConfig()
config.display()
#############################
input_image = KL.Input(shape=config.IMAGE_SHAPE, name='input_image')
basemodel = tf.keras.applications.resnet.ResNet101(input_shape=tuple(
config.IMAGE_SHAPE),
include_top=False)
layernames = [x.name for x in basemodel.layers]
Cname = [None] * 6
C = [None] * 6
for i in range(2, 6):
substr = 'conv' + str(i)
res = [x for x in layernames if substr in x]
Cname[i] = res[-1]
C[i] = basemodel.get_layer(name=res[-1])
P5 = KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (1, 1),
# prepare an iterators for each dataset
training_images = datagen.flow_from_directory(output_direc,
class_mode='binary',
batch_size=64,
subset='training')
validation_images = datagen.flow_from_directory(output_direc,
class_mode='binary',
batch_size=64,
subset='validation')
import tensorflow.keras.layers as layers
from tensorflow.keras.layers import Input, Dense, Flatten, Conv2D, MaxPooling2D, BatchNormalization, Dropout, Reshape, Concatenate, LeakyReLU
from tensorflow.keras.models import Model, Sequential
model = Sequential()
model.add(layers.Input(shape=(256, 256, 3)))
model.add(
layers.Conv2D(filters=6,
kernel_size=(3, 3),
activation='relu',
input_shape=(32, 32, 1)))
model.add(layers.AveragePooling2D())
model.add(layers.Conv2D(filters=16, kernel_size=(3, 3), activation='relu'))
model.add(layers.AveragePooling2D())
model.add(layers.Flatten())
model.add(layers.Dense(units=120, activation='relu'))
# layers.Conv2D(64,(5,5),activation='relu'),
# # baseModel,
# layers.BatchNormalization(),
# layers.MaxPool2D((4,4)),
# layers.Flatten(),
# layers.Dense(128,activation='relu'),
# layers.Dropout(.5),
# layers.Dense(64,activation='relu'),
# layers.Dense(13,activation='softmax')
# ])
## transfer learning
base_model = tf.keras.applications.MobileNet(
input_tensor=layers.Input(shape=(128, 128, 3)), include_top=False)
base_model.trainable = False
Network = tf.keras.Sequential([
base_model,
# using BatchNormalization
# layers.BatchNormalization(),
tf.keras.layers.GlobalAveragePooling2D(),
layers.Dense(64, activation='relu'),
# using dropOut
layers.Dropout(.2),
layers.Dense(32, activation='relu'),
# using dropOut
layers.Dropout(.2),
tf.keras.layers.Dense(13, activation='softmax')
])
def ResNet(stack_fn,
preact,
use_bias,
model_name='resnet',
include_top=True,
weights='imagenet',
input_tensor=None,
input_shape=None,
pooling=None,
classes=1000,
norm_use="bn",
**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.
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.
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.
"""
global backend, layers, models, keras_utils
#backend, layers, models, keras_utils = get_submodules_from_kwargs(kwargs)
if not (weights in {'imagenet', None} or os.path.exists(weights)):
raise ValueError('The `weights` argument should be either '
'`None` (random initialization), `imagenet` '
'(pre-training on ImageNet), '
'or the path to the weights file to be loaded.')
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=32,
data_format=backend.image_data_format(),
require_flatten=include_top,
weights=weights)
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)),
name='conv1_pad')(img_input)
x = layers.Conv2D(64,
7,
strides=2,
use_bias=use_bias,
name='conv1_conv',
kernel_initializer='he_normal')(x)
if preact is False:
x = normalize_layer(x, norm_use=norm_use, name='conv1_')
#x = layers.BatchNormalization(axis=bn_axis, epsilon=1.001e-5, name='conv1_bn')(x)
x = layers.Activation('relu', name='conv1_relu')(x)
x = layers.ZeroPadding2D(padding=((1, 1), (1, 1)), name='pool1_pad')(x)
x = layers.MaxPooling2D(3, strides=2, name='pool1_pool')(x)
x = stack_fn(x)
if preact is True:
x = normalize_layer(x, norm_use=norm_use, name='post_')
#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.GlobalAveragePooling2D(name='avg_pool')(x)
x = layers.Dense(classes, activation='softmax', name='probs')(x)
else:
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 = keras_utils.get_source_inputs(input_tensor)
else:
inputs = img_input
# Create model.
model = models.Model(inputs, x, name=model_name)
# Load weights.
if (weights == 'imagenet') and (model_name in WEIGHTS_HASHES):
if include_top:
file_name = model_name + '_weights_tf_dim_ordering_tf_kernels.h5'
file_hash = WEIGHTS_HASHES[model_name][0]
else:
file_name = model_name + '_weights_tf_dim_ordering_tf_kernels_notop.h5'
file_hash = WEIGHTS_HASHES[model_name][1]
weights_path = keras_utils.get_file(file_name,
BASE_WEIGHTS_PATH + file_name,
cache_subdir='models',
file_hash=file_hash)
model.load_weights(weights_path, by_name=True)
elif weights is not None:
model.load_weights(weights, by_name=True)
return model
def grid_search(train_images_t2b, train_labels_t2b, val_images_t2b, val_labels_t2b, dist,
dropout_level_lst=[0.05], beta2_lst=[0.999], beta1_lst=[0.9], lr_rate_lst = [0.001],
epsilon_lst=[1e-08], epo_lst = [3000], bat_size_lst = [128]
):
# initialize values
val_loss = np.inf
best_params = dict()
dist=dist
for dp_level in dropout_level_lst:
inputs_h2 = layers.Input(shape=(64,32,2))
# same as (rscale, cscale, 2)
# also same as the dimension for EACH image in the training set
encoder0_pool_h2, encoder0_h2 = encoder_block_h2(inputs_h2, 8, dropout_level=dp_level)
encoder1_pool_h2, encoder1_h2 = encoder_block_h2(encoder0_pool_h2, 16, dropout_level=dp_level)
encoder2_pool_h2, encoder2_h2 = encoder_block_h2(encoder1_pool_h2, 32, dropout_level=dp_level)
encoder3_pool_h2, encoder3_h2 = encoder_block_h2(encoder2_pool_h2, 64, dropout_level=dp_level)
center_h2 = conv_block_h2(encoder3_pool_h2, 128, dropout_level=dp_level)
decoder3_h2 = decoder_block_h2(center_h2, encoder3_h2, 64, dropout_level=dp_level)
decoder2_h2 = decoder_block_h2(decoder3_h2, encoder2_h2, 32, dropout_level=dp_level)
decoder1_h2 = decoder_block_h2(decoder2_h2, encoder1_h2, 16, dropout_level=dp_level)
outputs_h2 = layers.Conv2D(3, (1, 1), padding="same")(decoder1_h2) # simply set number of output channels here, seems legit
model_ht2b = models.Model(inputs=[inputs_h2], outputs=[outputs_h2])
for beta2 in beta2_lst:
for beta1 in beta1_lst:
for lr_rate in lr_rate_lst:
for eps in epsilon_lst:
adam=keras.optimizers.Adam(learning_rate = lr_rate, beta_1 = beta1, beta_2=beta2, epsilon = eps)
model_ht2b.compile(optimizer=adam,
loss=custom_loss_rmse) # let's use rmse for optimization becuase it is a bigger target than mse
# construct checkpoint for saving the best model for current training
curr_best_filepath=str(dist)+"/current.best.h5"
checkpoint = ModelCheckpoint(curr_best_filepath,
monitor='val_loss', # this must be the same string as a metric from your model training verbose output
verbose=1,
save_best_only=True, # only save the model if it out-performs all previous ones
mode='min', # we want minimum loss
save_weights_only=False # we want to save the entire model, not just the weights
)
callbacks_list = [checkpoint]
for epo in epo_lst:
for bat_size in bat_size_lst:
start = time.time()
history_ht2b = model_ht2b.fit(train_images_t2b,
train_labels_t2b,
validation_data = (val_images_t2b, val_labels_t2b),
epochs=epo,
batch_size=bat_size,
shuffle=True,
callbacks = callbacks_list,
verbose=1)
training_time = time.time()-start
# load best model from current training b/c the best model might not be the last model
model_ht2b = tf.keras.models.load_model(curr_best_filepath,
custom_objects={'custom_loss_rmse': custom_loss_rmse})
new_loss = custom_loss_rmse(val_labels_t2b, model_ht2b.predict(val_images_t2b))
if new_loss.numpy() < val_loss:
print()
print('final validation loss decreased from ', val_loss, ' to ', new_loss.numpy())
print('saving the current best model as the overall best model')
print(100*'*')
val_loss = new_loss.numpy()
best_params['best_dropout_rate'] = dp_level
best_params['best_beta_2'] = beta2
best_params['best_beta_1'] = beta1
best_params['best_learning_rate'] = lr_rate
best_params['best_epsilon'] = eps
best_params['best_epochs'] = epo
best_params['best_batch_size'] = bat_size
best_params['best_val_loss_reached'] = val_loss
best_params['training_time'] = training_time
best_params['val_loss_his'] = history_ht2b.history['val_loss']
best_params['train_loss_his'] = history_ht2b.history['loss']
# comment these out for now because they take way too much space when printed out
# save the best overall grid-searched model found so far
best_filepath = str(dist)+'/model.best.h5'
model_ht2b.save(best_filepath)
# save history of validation-loss from the best model to observe epochs effect
with open(str(dist)+'/best_val_loss_history.db', 'wb') as file_pi:
pk.dump(history_ht2b.history['val_loss'], file_pi)
# later open with
# val_loss_history_ht2b = pk.load(open('best_val_loss_history.db', "rb"))
# save history of training-loss from the best model to observe epochs effect
with open(str(dist)+'/best_train_loss_history.db', 'wb') as file_pi:
pk.dump(history_ht2b.history['loss'], file_pi)
# later open with
# train_loss_history_ht2b = pk.load(open('best_train_loss_history.db', "rb"))
# save the best_params dictionary along the way incase training gets killed mid-way and the function doesn't get to finish
# "w" mode automatically overwrites if the file already exists
param_json = json.dumps(best_params)
f = open(str(dist)+'/best_params.json',"w")
f.write(param_json)
f.close()
# save a plot of the val_loss_history for the best performing model for observation
fig, ax = get_figure()
fig.set_size_inches(20,10)
num_epochs=len(history_ht2b.history['val_loss'])
startpoints=0
ax.set_yscale('log') # set y-axis to log_10 scale for better viewing
ax.plot((np.arange(num_epochs*1)+1)[startpoints:],
history_ht2b.history['loss'][startpoints:],
linewidth=1, color="orange",
label="training_loss")
ax.plot((np.arange(num_epochs*1)+1)[startpoints:],
history_ht2b.history['val_loss'][startpoints:],
linewidth=1, color="blue",
label="validation loss")
ax.set_xlabel('epochs')
ax.set_ylabel('log loss')
ax.legend(frameon=False);
fig.savefig(str(dist)+'/best_model_loss_history.png')
else:
print('final validation loss did not decrease for this set of parameters')
print('current overall best model and parameters does not get updated')
print(100*'*')
return best_params
import tensorflow as tf
import tensorflow.keras.layers as KL
from sklearn.metrics import confusion_matrix
from mlxtend.plotting import plot_confusion_matrix
import numpy as np
## Dataset
mnist = tf.keras.datasets.mnist
(x_train, y_train), (x_test, y_test) = mnist.load_data()
x_train, x_test = x_train / 255.0, x_test / 255.0
## Model
inputs = KL.Input(shape=(28, 28))
# For RNN
#x = KL.RNN(64, activation ='relu')(inputs)
# For LSTM
x = KL.LSTM(128)(inputs) #Adds an LSTM with 128 Internal units
outputs = KL.Dense(10, activation="softmax")(x)
model = tf.keras.models.Model(inputs, outputs)
model.summary()
model.compile(
optimizer=
"adamax", #try with adamax and rmsprop too see slight variations in results
loss="sparse_categorical_crossentropy",
metrics=["acc"])
model.fit(x_train, y_train, epochs=5)
test_loss, test_acc = model.evaluate(x_test, y_test)
print("Loss: {0} - Acc: {1}".format(test_loss, test_acc))
predictions = model.predict(x_test)
def MobileNetV2(input_shape=None, alpha=1.0, classes=1000):
if input_shape == None:
# Channels last
input_shape = (224, 224, 3)
img_input = layers.Input(shape=input_shape)
first_block_filters = _make_divisible(32 * alpha, 8)
x = layers.ZeroPadding2D()(img_input)
x = layers.Conv2D(first_block_filters,
kernel_size=3,
strides=2,
padding='valid',
use_bias=False)(x)
x = layers.BatchNormalization()(x)
x = layers.ReLU(6.)(x)
x = _inverted_res_block(x,
first_block_filters,
filters=16,
alpha=alpha,
stride=1,
expansion=1,
block_id=0)
x = _inverted_res_block(x,
16,
filters=24,
alpha=alpha,
stride=2,
expansion=1,
block_id=1)
x = _inverted_res_block(x,
24,
filters=24,
alpha=alpha,
stride=1,
expansion=1,
block_id=2)
x = _inverted_res_block(x,
24,
filters=32,
alpha=alpha,
stride=2,
expansion=1,
block_id=3)
x = _inverted_res_block(x,
32,
filters=32,
alpha=alpha,
stride=1,
expansion=1,
block_id=4)
x = _inverted_res_block(x,
32,
filters=32,
alpha=alpha,
stride=1,
expansion=1,
block_id=5)
x = _inverted_res_block(x,
32,
filters=64,
alpha=alpha,
stride=2,
expansion=1,
block_id=6)
x = _inverted_res_block(x,
64,
filters=64,
alpha=alpha,
stride=1,
expansion=1,
block_id=7)
x = _inverted_res_block(x,
64,
filters=64,
alpha=alpha,
stride=1,
expansion=1,
block_id=8)
x = _inverted_res_block(x,
64,
filters=64,
alpha=alpha,
stride=1,
expansion=1,
block_id=9)
x = _inverted_res_block(x,
64,
filters=96,
alpha=alpha,
stride=1,
expansion=1,
block_id=10)
x = _inverted_res_block(x,
96,
filters=96,
alpha=alpha,
stride=1,
expansion=1,
block_id=11)
x = _inverted_res_block(x,
96,
filters=96,
alpha=alpha,
stride=1,
expansion=1,
block_id=12)
x = _inverted_res_block(x,
96,
filters=160,
alpha=alpha,
stride=2,
expansion=1,
block_id=13)
x = _inverted_res_block(x,
160,
filters=160,
alpha=alpha,
stride=1,
expansion=1,
block_id=14)
x = _inverted_res_block(x,
160,
filters=160,
alpha=alpha,
stride=1,
expansion=1,
block_id=15)
x = _inverted_res_block(x,
160,
filters=320,
alpha=alpha,
stride=1,
expansion=1,
block_id=16)
if alpha > 1.0:
last_block_filters = _make_divisible(1280 * alpha, 8)
else:
last_block_filters = 1280
x = tfmot.quantization.keras.quantize_annotate_layer(
layers.Conv2D(last_block_filters,
kernel_size=1,
use_bias=False,
name='Conv_1'))(x)
x = tfmot.quantization.keras.quantize_annotate_layer(
layers.BatchNormalization(name='Conv_1_bn'))(x)
x = layers.ReLU(6., name='out_relu')(x)
x = tfmot.quantization.keras.quantize_annotate_layer(
layers.GlobalAveragePooling2D())(x)
x = layers.Dense(classes, activation='sigmoid', name='predictions')(x)
model = keras.Model(img_input, x, name='mobilenetv2_%0.2f' % (alpha))
return model
def build():
"""Instantiates ResNet32 model """
# Parameters for Resnet32 on Cifar-100
num_blocks = 5
classes = 100
training = False
input_shape = (32, 32, 3)
img_input = layers.Input(shape=input_shape)
x = img_input
bn_axis = 1
if tf.keras.backend.image_data_format() == "channels_last":
bn_axis = 3
else:
bn_axis = 1
x = ZeroPadding2D(padding=(1, 1))(x)
x = Conv2D(
16,
(3, 3),
strides=(1, 1),
padding="valid",
kernel_initializer="he_normal",
kernel_regularizer=l2(L2_WEIGHT_DECAY),
bias_regularizer=l2(L2_WEIGHT_DECAY),
)(x)
x = BatchNormalization(
axis=bn_axis, momentum=BATCH_NORM_DECAY, epsilon=BATCH_NORM_EPSILON, fused=True
)(x, training=training)
x = Activation("approx_activation")(x)
x = resnet_block(
x,
size=num_blocks,
kernel_size=3,
filters=[16, 16],
stage=2,
conv_strides=(1, 1),
training=training,
)
x = resnet_block(
x,
size=num_blocks,
kernel_size=3,
filters=[32, 32],
stage=3,
conv_strides=(2, 2),
training=training,
)
x = resnet_block(
x,
size=num_blocks,
kernel_size=3,
filters=[64, 64],
stage=4,
conv_strides=(2, 2),
training=training,
)
x = AveragePooling2D(pool_size=(8, 8), strides=(1, 1), padding="VALID")(x)
x = Lambda(lambda w: tf.keras.backend.squeeze(w, 1))(x)
x = Lambda(lambda w: tf.keras.backend.squeeze(w, 1))(x)
x = Dense(
classes,
activation="softmax",
kernel_initializer="he_normal",
kernel_regularizer=l2(L2_WEIGHT_DECAY),
bias_regularizer=l2(L2_WEIGHT_DECAY),
)(x)
inputs = img_input
# Create model.
model = tf.keras.models.Model(inputs, x)
return model
def inception_v2_v3(input_shape=(299, 299, 3), num_classes=1000, v=2):
"""
Inception v2 and v3 implementation based on
https://arxiv.org/pdf/1512.00567v3.pdf
Args:
input_shape (tuple): input shape
num_classes (int): number of categories
v (int): v2 or v3?
Returns: inception v2 or v3 model
"""
bn = False if v == 2 else True
inp = layers.Input(shape=input_shape)
x = conv_batch_relu(inp, 32, 3, 2, 'valid', bn)
x = conv_batch_relu(x, 64, 3, 1, 'valid', bn)
x = layers.MaxPooling2D(3, 2)(x)
x = conv_batch_relu(x, 80, 3, 1, 'valid', bn)
x = conv_batch_relu(x, 192, 3, 2, 'valid', bn)
x = conv_batch_relu(x, 288, 3, 1, 'same', bn)
# 3 x inception as in figure 5
# first time!
b1 = conv_batch_relu(x, 48, 1, 1, 'same', bn)
b1 = conv_batch_relu(b1, 64, 3, 1, 'same', bn)
b1 = conv_batch_relu(b1, 64, 3, 1, 'same', bn)
b2 = conv_batch_relu(x, 64, 1, 1, 'same', bn)
b2 = conv_batch_relu(b2, 96, 3, 1, 'same', bn)
b3 = layers.AveragePooling2D(3, 1, padding='same')(x)
b3 = conv_batch_relu(b3, 64, 1, 1, 'same', bn)
b4 = conv_batch_relu(x, 64, 1, 1, 'same', bn)
x = layers.Concatenate()([b1, b2, b3, b4])
# 2nd time!
b1 = conv_batch_relu(x, 72, 1, 1, 'same', bn)
b1 = conv_batch_relu(b1, 96, 3, 1, 'same', bn)
b1 = conv_batch_relu(b1, 96, 3, 1, 'same', bn)
b2 = conv_batch_relu(x, 96, 1, 1, 'same', bn)
b2 = conv_batch_relu(b2, 144, 3, 1, 'same', bn)
b3 = layers.AveragePooling2D(3, 1, padding='same')(x)
b3 = conv_batch_relu(b3, 96, 1, 1, 'same', bn)
b4 = conv_batch_relu(x, 144, 1, 1, 'same', bn)
x = layers.Concatenate()([b1, b2, b3, b4])
# 3rd time!
b1 = conv_batch_relu(x, 144, 1, 1, 'same', bn)
b1 = conv_batch_relu(b1, 192, 3, 1, 'same', bn)
b1 = conv_batch_relu(b1, 192, 3, 2, 'valid', bn)
b2 = conv_batch_relu(x, 192, 1, 1, 'same', bn)
b2 = conv_batch_relu(b2, 288, 3, 2, 'valid', bn)
b3 = layers.MaxPooling2D(3, 2, padding='valid')(x)
b3 = conv_batch_relu(b3, 144, 1, 1, 'same', bn)
b4 = conv_batch_relu(x, 144, 3, 2, 'valid', bn)
x = layers.Concatenate()([b1, b2, b3, b4])
# 5 x inception as in figure 6
# first two times
for i in range(2):
b1 = conv_batch_relu(x, 128, 1, 1, 'same', bn)
b1 = conv_batch_relu(b1, 128, (1, 7), 1, 'same', bn)
b1 = conv_batch_relu(b1, 128, (7, 1), 1, 'same', bn)
b1 = conv_batch_relu(b1, 128, (1, 7), 1, 'same', bn)
b1 = conv_batch_relu(b1, 128, (7, 1), 1, 'same', bn)
b2 = conv_batch_relu(x, 128, 1, 1, 'same', bn)
b2 = conv_batch_relu(b2, 128, (1, 7), 1, 'same', bn)
b2 = conv_batch_relu(b2, 192, (7, 1), 1, 'same', bn)
b3 = layers.AveragePooling2D(3, 1, padding='same')(x)
b3 = conv_batch_relu(b3, 192, 1, 1, 'same', bn)
b4 = conv_batch_relu(x, 256, 1, 1, 'same', bn)
x = layers.Concatenate()([b1, b2, b3, b4])
# second two times
for i in range(2):
b1 = conv_batch_relu(x, 192, 1, 1, 'same', bn)
b1 = conv_batch_relu(b1, 192, (1, 7), 1, 'same', bn)
b1 = conv_batch_relu(b1, 192, (7, 1), 1, 'same', bn)
b1 = conv_batch_relu(b1, 192, (1, 7), 1, 'same', bn)
b1 = conv_batch_relu(b1, 192, (7, 1), 1, 'same', bn)
b2 = conv_batch_relu(x, 192, 1, 1, 'same', bn)
b2 = conv_batch_relu(b2, 192, (1, 7), 1, 'same', bn)
b2 = conv_batch_relu(b2, 256, (7, 1), 1, 'same', bn)
b3 = layers.AveragePooling2D(3, 1, padding='same')(x)
b3 = conv_batch_relu(b3, 256, 1, 1, 'same', bn)
b4 = conv_batch_relu(x, 320, 1, 1, 'same', bn)
x = layers.Concatenate()([b1, b2, b3, b4])
# 5th time
b1 = conv_batch_relu(x, 256, 3, 2, 'valid', bn)
b1 = conv_batch_relu(b1, 256, (1, 7), 1, 'same', bn)
b1 = conv_batch_relu(b1, 256, (7, 1), 1, 'same', bn)
b1 = conv_batch_relu(b1, 256, (1, 7), 1, 'same', bn)
b1 = conv_batch_relu(b1, 256, (7, 1), 1, 'same', bn)
b2 = conv_batch_relu(x, 256, 3, 2, 'valid', bn)
b2 = conv_batch_relu(b2, 256, (1, 7), 1, 'same', bn)
b2 = conv_batch_relu(b2, 320, (7, 1), 1, 'same', bn)
b3 = layers.MaxPooling2D(
3,
2,
)(x)
b3 = conv_batch_relu(b3, 320, 1, 1, 'same', bn)
b4 = conv_batch_relu(x, 384, 3, 2, 'valid', bn)
x = layers.Concatenate()([b1, b2, b3, b4])
# 2 x inception as in figure 7
for i in range(2):
b1 = conv_batch_relu(x, 448, 1, 1, 'same', bn)
b1 = conv_batch_relu(b1, 384, 3, 1, 'same', bn)
b1_1 = conv_batch_relu(b1, 384, (3, 1), 1, 'same', bn)
b1_2 = conv_batch_relu(b1, 384, (1, 3), 1, 'same', bn)
b1 = layers.Concatenate()([b1_1, b1_2])
b2 = conv_batch_relu(x, 384, 1, 1, 'same', bn)
b2_1 = conv_batch_relu(b2, 384, (3, 1), 1, 'same', bn)
b2_2 = conv_batch_relu(b2, 384, (1, 3), 1, 'same', bn)
b2 = layers.Concatenate()([b2_1, b2_2])
b3 = layers.AveragePooling2D(3, 1, padding='same')(x)
b3 = conv_batch_relu(b3, 192, 1, 1, 'same', bn)
b4 = conv_batch_relu(x, 320, 1, 1, 'same', bn)
x = layers.Concatenate()([b1, b2, b3, b4])
x = layers.GlobalAveragePooling2D()(x)
x = layers.Dense(num_classes, activation='softmax')(x)
model = Model(inputs=inp, outputs=x)
model.summary()
return model
def train(dataset, latent_size, batch_size, epochs, lr, outdir, decay=6e-8):
x_train, y_train, image_size, num_labels = dataloader(dataset)
model_name = "cgan_" + dataset
input_shape = (image_size, image_size, 1)
label_shape = (num_labels, )
##################################################################
inputs = layers.Input(shape=input_shape, name='discriminator_input')
labels = layers.Input(shape=label_shape, name='class_labels')
discriminator = make_discriminator(inputs, labels, image_size)
optimizer = keras.optimizers.Adam(lr=lr, decay=decay)
discriminator.compile(loss='binary_crossentropy',
optimizer=optimizer,
metrics=['accuracy'])
discriminator.summary()
##################################################################
input_shape = (latent_size, )
inputs = layers.Input(shape=input_shape, name='z_input')
generator = make_generator(inputs, labels, image_size)
generator.summary()
optimizer = keras.optimizers.Adam(lr=lr * 0.5, decay=decay * 0.5)
discriminator.trainable = False
outputs = discriminator([generator([inputs, labels]), labels])
gan = keras.models.Model([inputs, labels], outputs, name=model_name)
gan.compile(loss='binary_crossentropy',
optimizer=optimizer,
metrics=['accuracy'])
gan.summary()
##################################################################
noise_input = np.random.uniform(-1.0, 1.0, size=[100, latent_size])
noise_class = np.eye(num_labels)[np.arange(0, 100) % num_labels]
train_size = x_train.shape[0]
batch_count = int(train_size / batch_size)
G_Losses = []
D_Losses = []
print(model_name, "Labels for generated images: ",
np.argmax(noise_class, axis=1))
for e in range(1, epochs + 1):
for b_c in range(batch_count):
random = np.random.randint(0, train_size, size=batch_size)
real_images = x_train[random]
real_labels = y_train[random]
noise = np.random.uniform(-1.0,
1.0,
size=[batch_size, latent_size])
fake_labels = np.eye(num_labels)[np.random.choice(
num_labels, batch_size)]
fake_images = generator.predict([noise, fake_labels])
x = np.concatenate((real_images, fake_images))
labels = np.concatenate((real_labels, fake_labels))
y = np.ones([2 * batch_size, 1])
y[batch_size:, :] = 0.0
d_loss, d_acc = discriminator.train_on_batch([x, labels], y)
log = "[discriminator loss: %f || acc: %f || ]" % (d_loss, d_acc)
noise = np.random.uniform(-1.0,
1.0,
size=[batch_size, latent_size])
fake_labels = np.eye(num_labels)[np.random.choice(
num_labels, batch_size)]
y = np.ones([batch_size, 1])
gan_loss, gan_acc = gan.train_on_batch([noise, fake_labels], y)
log = "%s [gan loss: %f || acc: %f]" % (log, gan_loss, gan_acc)
print("[epoch: %d] %s" % (e, log))
G_Losses.append(gan_loss)
D_Losses.append(d_loss)
plot_images(
generator,
noise_input=noise_input,
noise_class=noise_class,
outdir=outdir,
show=True,
epoch=e,
)
plt.plot(G_Losses, label='Generator')
plt.plot(D_Losses, label='Discriminator')
plt.legend()
plt.savefig(outdir + "plot.png")
plt.show()
make_gif(outdir, model_name, epochs)
abs(f(q[0])-f(q[1]))=0
"""
import tensorflow as tf
from tensorflow import keras
from tensorflow.keras import layers
from tensorflow.keras import backend as K
outdim = 2
import sys
if len(sys.argv) > 1:
outdim = int(sys.argv[1])
model = keras.Sequential([
layers.Input((3, )),
layers.Dense(5),
layers.Dense(9),
layers.Dense(5),
layers.Dense(outdim),
])
def loss(out, q):
#print(q.shape)
#exit()
#std=1
l1 = K.mean((K.mean(K.abs(q), axis=(0, 1)) - 1)**2)
#mean=0
def cnn_rnn_model(input_dim, filters, kernel_size, conv_stride, conv_border_mode, units, output_dim=155):
''' CNN + RNN '''
input_data = layers.Input(name='input', shape = input_dim)
# convolutional layer
conv_1d = layers.Conv1D(filters, kernel_size, strides=conv_stride, padding=conv_border_mode, activation='relu',name='conv1d')(input_data)
# max pool
max_pool = layers.MaxPooling1D(pool_size=4)(conv_1d)
# batch normalization
bn_cnn = layers.BatchNormalization(name='bn_conv_1d')(max_pool)
# convolutional layer #2
conv_1d_2 = layers.Conv1D(filters, kernel_size, strides=conv_stride, padding=conv_border_mode, activation='relu',name='conv1d_2')(bn_cnn)
# max pool
max_pool = layers.MaxPooling1D(pool_size=4)(conv_1d_2)
# batch normalization
bn_cnn_2 = layers.BatchNormalization(name='bn_conv_1d_2')(max_pool)
# convolutional layer #3
conv_1d_2 = layers.Conv1D(filters, kernel_size, strides=conv_stride, padding=conv_border_mode, activation='relu',name='conv1d_3')(bn_cnn_2)
# max pool
max_pool = layers.MaxPooling1D(pool_size=4)(conv_1d_2)
# batch normalization
bn_cnn_2 = layers.BatchNormalization(name='bn_conv_1d_3')(conv_1d_2)
# convolutional layer #4
conv_1d_2 = layers.Conv1D(filters, kernel_size, strides=conv_stride, padding=conv_border_mode, activation='relu',name='conv1d_4')(bn_cnn_2)
# max pool
max_pool = layers.MaxPooling1D(pool_size=4)(conv_1d_2)
# batch normalization
bn_cnn_2 = layers.BatchNormalization(name='bn_conv_1d_4')(conv_1d_2)
# convolutional layer #5
conv_1d_2 = layers.Conv1D(filters, kernel_size, strides=conv_stride, padding=conv_border_mode, activation='relu',name='conv1d_5')(bn_cnn_2)
# max pool
max_pool = layers.MaxPooling1D(pool_size=4)(conv_1d_2)
# batch normalization
bn_cnn_2 = layers.BatchNormalization(name='bn_conv_1d_5')(conv_1d_2)
# recurrent layer
simp_rnn = layers.SimpleRNN(units, activation='relu', return_sequences=True, implementation=2, name='rnn')(bn_cnn_2)
# batch normalization
bn_rnn = layers.BatchNormalization()(simp_rnn)
# recurrent layer
# simp_rnn = layers.SimpleRNN(units//4, activation='relu', return_sequences=True, implementation=2, name='rnn_2')(bn_rnn)
# # batch normalization
# bn_rnn = layers.BatchNormalization()(simp_rnn)
flat = layers.Flatten()(bn_rnn)
dense = layers.Dense(512)(flat)
dense = layers.Dense(256)(dense)
dense = layers.Dense(output_dim)(dense)
# TimeDistributed(Dense(output_dim)) layer
# time_dense = layers.TimeDistributed(layers.Dense(output_dim))(bn_rnn)
# sigmoid activation layer
y_pred = layers.Activation('sigmoid', name='sigmoid')(dense)
model = models.Model(inputs=input_data, outputs=y_pred)
#model.output_length = lambda x: cnn_output_length(x, kernel_size, conv_border_mode, conv_stride)
print(model.summary())
return model
def create_model(self, img_shape, num_class, d=32):
concat_axis = 3
inputs = layers.Input(shape=img_shape)
conv1 = layers.Conv2D(d, (3, 3),
activation='relu',
padding='same',
name='conv1_1')(inputs)
conv1 = layers.Conv2D(d, (3, 3), activation='relu',
padding='same')(conv1)
pool1 = layers.MaxPooling2D(pool_size=(2, 2))(conv1)
conv2 = layers.Conv2D(d * 2, (3, 3), activation='relu',
padding='same')(pool1)
conv2 = layers.Conv2D(d * 2, (3, 3), activation='relu',
padding='same')(conv2)
pool2 = layers.MaxPooling2D(pool_size=(2, 2))(conv2)
conv3 = layers.Conv2D(d * 4, (3, 3), activation='relu',
padding='same')(pool2)
conv3 = layers.Conv2D(d * 4, (3, 3), activation='relu',
padding='same')(conv3)
pool3 = layers.MaxPooling2D(pool_size=(2, 2))(conv3)
conv4 = layers.Conv2D(d * 8, (3, 3), activation='relu',
padding='same')(pool3)
conv4 = layers.Conv2D(d * 8, (3, 3), activation='relu',
padding='same')(conv4)
pool4 = layers.MaxPooling2D(pool_size=(2, 2))(conv4)
conv5 = layers.Conv2D(d * 16, (3, 3),
activation='relu',
padding='same')(pool4)
conv5 = layers.Conv2D(d * 16, (3, 3),
activation='relu',
padding='same')(conv5)
up_conv5 = layers.UpSampling2D(size=(2, 2))(conv5)
ch, cw = self.get_crop_shape(conv4, up_conv5)
crop_conv4 = layers.Cropping2D(cropping=(ch, cw))(conv4)
up6 = layers.concatenate([up_conv5, crop_conv4], axis=concat_axis)
conv6 = layers.Conv2D(d * 8, (3, 3), activation='relu',
padding='same')(up6)
conv6 = layers.Conv2D(d * 8, (3, 3), activation='relu',
padding='same')(conv6)
up_conv6 = layers.UpSampling2D(size=(2, 2))(conv6)
ch, cw = self.get_crop_shape(conv3, up_conv6)
crop_conv3 = layers.Cropping2D(cropping=(ch, cw))(conv3)
up7 = layers.concatenate([up_conv6, crop_conv3], axis=concat_axis)
conv7 = layers.Conv2D(d * 4, (3, 3), activation='relu',
padding='same')(up7)
conv7 = layers.Conv2D(d * 4, (3, 3), activation='relu',
padding='same')(conv7)
up_conv7 = layers.UpSampling2D(size=(2, 2))(conv7)
ch, cw = self.get_crop_shape(conv2, up_conv7)
crop_conv2 = layers.Cropping2D(cropping=(ch, cw))(conv2)
up8 = layers.concatenate([up_conv7, crop_conv2], axis=concat_axis)
conv8 = layers.Conv2D(d * 2, (3, 3), activation='relu',
padding='same')(up8)
conv8 = layers.Conv2D(d * 2, (3, 3), activation='relu',
padding='same')(conv8)
up_conv8 = layers.UpSampling2D(size=(2, 2))(conv8)
ch, cw = self.get_crop_shape(conv1, up_conv8)
crop_conv1 = layers.Cropping2D(cropping=(ch, cw))(conv1)
up9 = layers.concatenate([up_conv8, crop_conv1], axis=concat_axis)
conv9 = layers.Conv2D(d, (3, 3), activation='relu',
padding='same')(up9)
conv9 = layers.Conv2D(d, (3, 3), activation='relu',
padding='same')(conv9)
ch, cw = self.get_crop_shape(inputs, conv9)
conv9 = layers.ZeroPadding2D(padding=((ch[0], ch[1]), (cw[0],
cw[1])))(conv9)
conv10 = layers.Conv2D(num_class, (1, 1), activation="sigmoid")(conv9)
model = models.Model(inputs=inputs, outputs=conv10)
return model
train_ds = train_ds.batch(batch_size)
val_ds = val_ds.batch(batch_size)
train_ds = train_ds.cache().prefetch(AUTOTUNE)
val_ds = val_ds.cache().prefetch(AUTOTUNE)
for spectrogram, _ in spectrogram_ds.take(1):
input_shape = spectrogram.shape
print('Input shape:', input_shape)
num_labels = len(commands)
norm_layer = preprocessing.Normalization()
norm_layer.adapt(spectrogram_ds.map(lambda x, _: x))
model = models.Sequential([
layers.Input(shape=input_shape),
preprocessing.Resizing(32, 32),
norm_layer,
layers.Conv2D(32, 3, activation='relu'),
layers.Conv2D(64, 3, activation='relu'),
layers.MaxPooling2D(),
layers.Dropout(0.25),
layers.Flatten(),
layers.Dense(128, activation='relu'),
layers.Dropout(0.5),
layers.Dense(num_labels),
])
model.summary()
model.compile(
def build_default_model(self):
''' build default straight forward BNN from architecture dictionary '''
# infer number of input neurons from number of train variables
number_of_input_neurons = self.data.n_input_neurons
# get all the architecture settings needed to build model
number_of_neurons_per_layer = self.architecture["layers"]
dropout = self.architecture["Dropout"]
activation_function = self.architecture["activation_function"]
output_activation = self.architecture["output_activation"]
# Specify the posterior distributions for kernel and bias
def posterior(kernel_size, bias_size=0, dtype=None):
from tensorflow_probability import layers
from tensorflow_probability import distributions as tfd
import numpy as np
import tensorflow as tf
n = kernel_size + bias_size
c = np.log(np.expm1(1.))
return tf.keras.Sequential([
layers.VariableLayer(2 * n, dtype=dtype),
layers.DistributionLambda(lambda t: tfd.Independent(
tfd.Normal(loc=t[..., :n],
scale=1e-5 + tf.math.softplus(c + t[..., n:])),
reinterpreted_batch_ndims=1)),
])
# Specify the prior distributions for kernel and bias
def prior(kernel_size, bias_size=0, dtype=None):
from tensorflow_probability import layers
from tensorflow_probability import distributions as tfd
import numpy as np
import tensorflow as tf
n = kernel_size + bias_size
c = np.log(np.expm1(1.))
return tf.keras.Sequential([
layers.VariableLayer(n, dtype=dtype),
layers.DistributionLambda(lambda t: tfd.Independent(
tfd.Normal(loc=t, scale=1.), reinterpreted_batch_ndims=1
)), #[:n]#1e-5 + tf.math.softplus(c + t[n:])
])
# define input layer
Inputs = layer.Input(shape=(number_of_input_neurons, ),
name=self.inputName)
X = Inputs
self.layer_list = [X]
n_train_samples = 0.75 * self.data.get_train_data(
as_matrix=True).shape[0] #1.0*self.architecture["batch_size"]
self.use_bias = True
# loop over dense layers
for iLayer, nNeurons in enumerate(number_of_neurons_per_layer):
X = DenseVariational(units=nNeurons,
make_posterior_fn=posterior,
make_prior_fn=prior,
kl_weight=1. / n_train_samples,
kl_use_exact=False,
use_bias=self.use_bias,
activation=activation_function,
name="DenseLayer_" + str(iLayer))(X)
# add dropout percentage to layer if activated
if not dropout == 0:
X = layer.Dropout(dropout,
name="DropoutLayer_" + str(iLayer))(X)
# generate output layer
X = DenseVariational(units=self.data.n_output_neurons,
make_posterior_fn=posterior,
make_prior_fn=prior,
kl_weight=1. / n_train_samples,
kl_use_exact=False,
use_bias=self.use_bias,
activation=output_activation.lower(),
name=self.outputName)(X)
# define model
model = models.Model(inputs=[Inputs], outputs=[X])
model.summary()
return model
(x_train,
y_train), (x_val,
y_val) = keras.datasets.imdb.load_data(num_words=vocab_size)
print(len(x_train), "Training sequences")
print(len(x_val), "Validation sequences")
x_train = keras.preprocessing.sequence.pad_sequences(x_train,
maxlen=maxlen)
x_val = keras.preprocessing.sequence.pad_sequences(x_val, maxlen=maxlen)
embed_dim = 32 # Embedding size for each token
num_heads = 2 # Number of attention heads
ff_dim = 32 # Hidden layer size in feed forward network inside transformer
method = 'linear'
supports = 10
inputs = layers.Input(shape=(maxlen, ))
embedding_layer = TokenAndPositionEmbedding(maxlen, vocab_size, embed_dim)
x = embedding_layer(inputs)
transformer_block = TransformerBlock(embed_dim, num_heads, ff_dim, method,
supports)
x = transformer_block(x)
x = layers.GlobalAveragePooling1D()(x)
x = layers.Dropout(0.1)(x)
x = layers.Dense(20, activation="relu")(x)
x = layers.Dropout(0.1)(x)
outputs = layers.Dense(2, activation="softmax")(x)
model = keras.Model(inputs=inputs, outputs=outputs)
model.compile("adam",
"sparse_categorical_crossentropy",
metrics=["accuracy"])
#Actor Critic Method
#https://keras.io/examples/rl/actor_critic_cartpole/
import gym
import numpy as np
import tensorflow as tf
from tensorflow import keras
from tensorflow.keras import layers
gamma = 0.99 # Discount factor for past rewards
max_steps_per_episode = 10000
env = gym.make("CartPole-v0") # Create the environment
eps = np.finfo(np.float32).eps.item() # Smallest number such that 1.0 + eps != 1.0
n_input = 4
#Left and Right
n_actions = 2
inputs = layers.Input(shape=(num_inputs,))
dense = layers.Dense(num_hidden, activation="relu")(inputs)
action = layers.Dense(num_actions, activation="softmax")(dense)
critic = layers.Dense(1)(common)
model = keras.Model(inputs=inputs, outputs=[action, critic])
def Agent():
def seismo_performer_with_spec(
maxlen=400,
nfft=64,
hop_length=16,
patch_size_1=22,
patch_size_2=3,
num_channels=3,
num_patches=11,
d_model=48,
num_heads=2,
ff_dim_factor=2,
layers_depth=2,
num_classes=3,
drop_out_rate=0.1):
"""
The model for P/S/N waves classification using ViT approach
with converted raw signal to spectrogram and the treat it as input to PERFORMER
Parameters:
:maxlen: maximum samples of waveforms
:nfft: number of FFTs in short-time Fourier transform
:hop_length: Hop length in sample between analysis windows
:patch_size_1: patch size for first dimention (depends on nfft/hop_length)
:patch_size_2: patch size for second dimention (depends on nfft/hop_length)
:num_channels: number of channels (usually it's equal to 3)
:num_patches: resulting number of patches (FIX manual setup!)
:d_model: Embedding size for each token
:num_heads: Number of attention heads
:ff_dim_factor: Hidden layer size in feed forward network inside transformer
ff_dim = d_model * ff_dim_factor
:layers_depth: The number of transformer blocks
:num_classes: The number of classes to predict
:returns: Keras model object
"""
num_patches = num_patches
ff_dim = d_model * ff_dim_factor
inputs = layers.Input(shape=(maxlen, num_channels))
# do transform
x = STFT(n_fft=nfft,
window_name=None,
pad_end=False,
hop_length=hop_length,
input_data_format='channels_last',
output_data_format='channels_last',)(inputs)
x = Magnitude()(x)
x = MagnitudeToDecibel()(x)
# custom normalization
x = MaxABSScaler()(x)
# patch the input channel
x = Rearrange3d(p1=patch_size_1,p2=patch_size_2)(x)
# embedding
x = tf.keras.layers.Dense(d_model)(x)
# add cls token
x = ClsToken(d_model)(x)
# positional embeddings
x = PosEmbeding2(num_patches=num_patches + 1, projection_dim=d_model)(x)
# encoder block
for i in range(layers_depth):
x = PerformerBlock(d_model, num_heads, ff_dim, rate=drop_out_rate)(x)
# to MLP head
x = tf.keras.layers.Lambda(lambda x: x[:, 0])(x)
x = tf.keras.layers.LayerNormalization(epsilon=1e-6)(x)
# MLP-head
x = layers.Dropout(drop_out_rate)(x)
x = tf.keras.layers.Dense(d_model*ff_dim_factor, activation='gelu')(x)
x = layers.Dropout(drop_out_rate)(x)
x = tf.keras.layers.Dense(d_model, activation='gelu')(x)
x = layers.Dropout(drop_out_rate)(x)
outputs = layers.Dense(num_classes, activation='softmax')(x)
model = keras.Model(inputs=inputs, outputs=outputs)
return model
try:
filepath = PATH_VALIDATIONDATA + MODELNAME + "/"
files = os.listdir(filepath)
for f in files:
shutil.copy2(filepath + f, PATH_TRAINDATA)
except Exception as e:
print(e)
valacc = 0.0
# Generating the model
print("Generating model ...")
# RESNET
input1 = layers.Input(shape=(None, 61))
lstm1 = layers.LSTM(UNITS, return_sequences=True)(input1)
lstm2 = layers.LSTM(UNITS, return_sequences=True)(lstm1)
merge1 = layers.Concatenate(axis=2)([input1,lstm2])
merge2 = layers.Concatenate(axis=2)([input1,merge1])
lstm3 = layers.LSTM(UNITS, return_sequences=True)(merge2)
lstm4 = layers.LSTM(UNITS, return_sequences=True)(lstm3)
merge3 = layers.Concatenate(axis=2)([merge1,lstm4])
merge4 = layers.Concatenate(axis=2)([input1,merge3])
lstm5 = layers.LSTM(UNITS, return_sequences=True)(merge4)
lstm6 = layers.LSTM(UNITS, return_sequences=True)(lstm5)
merge5 = layers.Concatenate(axis=2)([merge3,lstm6])
merge6 = layers.Concatenate(axis=2)([input1,merge5])
lstm7 = layers.LSTM(UNITS, return_sequences=True)(merge6)
lstm8 = layers.LSTM(UNITS, return_sequences=True)(lstm7)
merge7 = layers.Concatenate(axis=2)([merge5,lstm8])
def efficientdet(phi,
num_classes=20,
num_anchors=9,
weighted_bifpn=False,
freeze_bn=False,
score_threshold=0.01,
detect_quadrangle=False,
anchor_parameters=None,
separable_conv=True):
assert phi in range(7)
input_size = image_sizes[phi]
input_shape = (input_size, input_size, 3)
image_input = layers.Input(input_shape)
w_bifpn = w_bifpns[phi]
d_bifpn = d_bifpns[phi]
w_head = w_bifpn
d_head = d_heads[phi]
backbone_cls = backbones[phi]
features = backbone_cls(input_tensor=image_input, freeze_bn=freeze_bn)
if weighted_bifpn:
fpn_features = features
for i in range(d_bifpn):
fpn_features = build_wBiFPN(fpn_features,
w_bifpn,
i,
freeze_bn=freeze_bn)
else:
fpn_features = features
for i in range(d_bifpn):
fpn_features = build_BiFPN(fpn_features,
w_bifpn,
i,
freeze_bn=freeze_bn)
box_net = BoxNet(w_head,
d_head,
num_anchors=num_anchors,
separable_conv=separable_conv,
freeze_bn=freeze_bn,
detect_quadrangle=detect_quadrangle,
name='box_net')
class_net = ClassNet(w_head,
d_head,
num_classes=num_classes,
num_anchors=num_anchors,
separable_conv=separable_conv,
freeze_bn=freeze_bn,
name='class_net')
classification = [
class_net([feature, i]) for i, feature in enumerate(fpn_features)
]
classification = layers.Concatenate(axis=1,
name='classification')(classification)
regression = [
box_net([feature, i]) for i, feature in enumerate(fpn_features)
]
regression = layers.Concatenate(axis=1, name='regression')(regression)
model = models.Model(inputs=[image_input],
outputs=[classification, regression],
name='efficientdet')
# apply predicted regression to anchors
anchors = anchors_for_shape((input_size, input_size),
anchor_params=anchor_parameters)
anchors_input = np.expand_dims(anchors, axis=0)
boxes = RegressBoxes(name='boxes')([anchors_input, regression[..., :4]])
boxes = ClipBoxes(name='clipped_boxes')([image_input, boxes])
# filter detections (apply NMS / score threshold / select top-k)
if detect_quadrangle:
detections = FilterDetections(name='filtered_detections',
score_threshold=score_threshold,
detect_quadrangle=True)([
boxes, classification,
regression[..., 4:8], regression[...,
8]
])
else:
detections = FilterDetections(name='filtered_detections',
score_threshold=score_threshold)(
[boxes, classification])
prediction_model = models.Model(inputs=[image_input],
outputs=detections,
name='efficientdet_p')
return model, prediction_model
def build(self, mode, config):
"""Build Mask R-CNN architecture.
input_shape: The shape of the input image.
mode: Either "training" or "inference". The inputs and
outputs of the model differ accordingly.
"""
assert mode in ['training', 'inference']
# Image size must be dividable by 2 multiple times
h, w = config.IMAGE_SHAPE[:2]
if h / 2**6 != int(h / 2**6) or w / 2**6 != int(w / 2**6):
raise Exception(
"Image size must be dividable by 2 at least 6 times "
"to avoid fractions when downscaling and upscaling."
"For example, use 256, 320, 384, 448, 512, ... etc. ")
# Inputs
input_image = KL.Input(shape=[None, None, config.IMAGE_SHAPE[2]],
name="input_image")
input_image_meta = KL.Input(shape=[config.IMAGE_META_SIZE],
name="input_image_meta")
if mode == "training":
# RPN GT
input_rpn_match = KL.Input(shape=[None, 1],
name="input_rpn_match",
dtype=tf.int32)
input_rpn_bbox = KL.Input(shape=[None, 4],
name="input_rpn_bbox",
dtype=tf.float32)
# Detection GT (class IDs, bounding boxes, and masks)
# 1. GT Class IDs (zero padded)
input_gt_class_ids = KL.Input(shape=[None],
name="input_gt_class_ids",
dtype=tf.int32)
# 2. GT Boxes in pixels (zero padded)
# [batch, MAX_GT_INSTANCES, (y1, x1, y2, x2)] in image coordinates
input_gt_boxes = KL.Input(shape=[None, 4],
name="input_gt_boxes",
dtype=tf.float32)
# Normalize coordinates
gt_boxes = KL.Lambda(lambda x: norm_boxes_graph(
x,
K.shape(input_image)[1:3]))(input_gt_boxes)
# 3. GT Masks (zero padded)
# [batch, height, width, MAX_GT_INSTANCES]
if config.USE_MINI_MASK:
input_gt_masks = KL.Input(shape=[
config.MINI_MASK_SHAPE[0], config.MINI_MASK_SHAPE[1], None
],
name="input_gt_masks",
dtype=bool)
else:
input_gt_masks = KL.Input(
shape=[config.IMAGE_SHAPE[0], config.IMAGE_SHAPE[1], None],
name="input_gt_masks",
dtype=bool)
elif mode == "inference":
# Anchors in normalized coordinates
input_anchors = KL.Input(shape=[None, 4], name="input_anchors")
# Build the shared convolutional layers.
# Bottom-up Layers
# Returns a list of the last layers of each stage, 5 in total.
# Don't create the thead (stage 5), so we pick the 4th item in the list.
if callable(config.BACKBONE):
_, C2, C3, C4, C5 = config.BACKBONE(input_image,
stage5=True,
train_bn=config.TRAIN_BN)
else:
_, C2, C3, C4, C5 = resnet_graph(input_image,
config.BACKBONE,
stage5=True,
train_bn=config.TRAIN_BN)
# Top-down Layers
# TODO: add assert to varify feature map sizes match what's in config
P5 = KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (1, 1),
name='fpn_c5p5')(C5)
P4 = KL.Add(name="fpn_p4add")([
KL.UpSampling2D(size=(2, 2), name="fpn_p5upsampled")(P5),
KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (1, 1),
name='fpn_c4p4')(C4)
])
P3 = KL.Add(name="fpn_p3add")([
KL.UpSampling2D(size=(2, 2), name="fpn_p4upsampled")(P4),
KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (1, 1),
name='fpn_c3p3')(C3)
])
P2 = KL.Add(name="fpn_p2add")([
KL.UpSampling2D(size=(2, 2), name="fpn_p3upsampled")(P3),
KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (1, 1),
name='fpn_c2p2')(C2)
])
# Attach 3x3 conv to all P layers to get the final feature maps.
P2 = KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (3, 3),
padding="SAME",
name="fpn_p2")(P2)
P3 = KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (3, 3),
padding="SAME",
name="fpn_p3")(P3)
P4 = KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (3, 3),
padding="SAME",
name="fpn_p4")(P4)
P5 = KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (3, 3),
padding="SAME",
name="fpn_p5")(P5)
# P6 is used for the 5th anchor scale in RPN. Generated by
# # subsampling from P5 with stride of 2.
P6 = KL.MaxPooling2D(pool_size=(1, 1), strides=2, name="fpn_p6")(P5)
# Bottom-up Layers
N3 = KL.Add(name="fpn_n3add")([
P3,
KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (3, 3),
strides=(2, 2),
padding="SAME",
name='fpn_n2conv')(P2)
])
N4 = KL.Add(name="fpn_n4add")([
P4,
KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (3, 3),
strides=(2, 2),
padding="SAME",
name='fpn_n4conv')(N3)
])
N5 = KL.Add(name="fpn_n5add")([
P5,
KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (3, 3),
strides=(2, 2),
padding="SAME",
name='fpn_n5conv')(N4)
])
N3 = KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (3, 3),
strides=(1, 1),
padding="SAME",
name="fpn_n3")(N3)
N4 = KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (3, 3),
strides=(1, 1),
padding="SAME",
name="fpn_n4")(N4)
N5 = KL.Conv2D(config.TOP_DOWN_PYRAMID_SIZE, (3, 3),
strides=(1, 1),
padding="SAME",
name="fpn_n5")(N5)
N6 = KL.MaxPooling2D(pool_size=(1, 1), strides=2, name="fpn_n6")(N5)
# Note that P6 is used in RPN, but not in the classifier heads.
rpn_feature_maps = [P2, N3, N4, N5, N6]
mrcnn_feature_maps = [P2, N3, N4, N5]
# Anchors
if mode == "training":
anchors = self.get_anchors(config.IMAGE_SHAPE)
# Duplicate across the batch dimension because Keras requires it
# TODO: can this be optimized to avoid duplicating the anchors?
anchors = np.broadcast_to(anchors,
(config.BATCH_SIZE, ) + anchors.shape)
# A hack to get around Keras's bad support for constants
anchors = KL.Lambda(lambda x: tf.Variable(anchors),
name="anchors")(input_image)
else:
anchors = input_anchors
# RPN Model
rpn = build_rpn_model(config.RPN_ANCHOR_STRIDE,
len(config.RPN_ANCHOR_RATIOS),
config.TOP_DOWN_PYRAMID_SIZE)
# Loop through pyramid layers
layer_outputs = [] # list of lists
for p in rpn_feature_maps:
layer_outputs.append(rpn([p]))
# Concatenate layer outputs
# Convert from list of lists of level outputs to list of lists
# of outputs across levels.
# e.g. [[a1, b1, c1], [a2, b2, c2]] => [[a1, a2], [b1, b2], [c1, c2]]
output_names = ["rpn_class_logits", "rpn_class", "rpn_bbox"]
outputs = list(zip(*layer_outputs))
outputs = [
KL.Concatenate(axis=1, name=n)(list(o))
for o, n in zip(outputs, output_names)
]
rpn_class_logits, rpn_class, rpn_bbox = outputs
# Generate proposals
# Proposals are [batch, N, (y1, x1, y2, x2)] in normalized coordinates
# and zero padded.
proposal_count = config.POST_NMS_ROIS_TRAINING if mode == "training" \
else config.POST_NMS_ROIS_INFERENCE
rpn_rois = ProposalLayer(proposal_count=proposal_count,
nms_threshold=config.RPN_NMS_THRESHOLD,
name="ROI",
config=config)([rpn_class, rpn_bbox, anchors])
if mode == "training":
# Class ID mask to mark class IDs supported by the dataset the image
# came from.
active_class_ids = KL.Lambda(lambda x: parse_image_meta_graph(x)[
"active_class_ids"])(input_image_meta)
if not config.USE_RPN_ROIS:
# Ignore predicted ROIs and use ROIs provided as an input.
input_rois = KL.Input(shape=[config.POST_NMS_ROIS_TRAINING, 4],
name="input_roi",
dtype=np.int32)
# Normalize coordinates
target_rois = KL.Lambda(lambda x: norm_boxes_graph(
x,
K.shape(input_image)[1:3]))(input_rois)
else:
target_rois = rpn_rois
# Generate detection targets
# Subsamples proposals and generates target outputs for training
# Note that proposal class IDs, gt_boxes, and gt_masks are zero
# padded. Equally, returned rois and targets are zero padded.
rois, target_class_ids, target_bbox, target_mask = \
DetectionTargetLayer(config, name="proposal_targets")([
target_rois, input_gt_class_ids, gt_boxes, input_gt_masks])
# Network Heads
# TODO: verify that this handles zero padded ROIs
mrcnn_class_logits, mrcnn_class, mrcnn_bbox = \
panet_fpn_classifier_graph(rois, mrcnn_feature_maps, input_image_meta,
config.POOL_SIZE, config.NUM_CLASSES,
train_bn=config.TRAIN_BN,
fc_layers_size=config.FPN_CLASSIF_FC_LAYERS_SIZE)
mrcnn_mask = panet_build_fpn_mask_graph(rois,
mrcnn_feature_maps,
input_image_meta,
config.MASK_POOL_SIZE,
config.NUM_CLASSES,
train_bn=config.TRAIN_BN)
# TODO: clean up (use tf.identify if necessary)
output_rois = KL.Lambda(lambda x: x * 1, name="output_rois")(rois)
# Losses
rpn_class_loss = KL.Lambda(lambda x: rpn_class_loss_graph(*x),
name="rpn_class_loss")(
[input_rpn_match, rpn_class_logits])
rpn_bbox_loss = KL.Lambda(
lambda x: rpn_bbox_loss_graph(config, *x),
name="rpn_bbox_loss")(
[input_rpn_bbox, input_rpn_match, rpn_bbox])
class_loss = KL.Lambda(lambda x: mrcnn_class_loss_graph(*x),
name="mrcnn_class_loss")([
target_class_ids, mrcnn_class_logits,
active_class_ids
])
bbox_loss = KL.Lambda(lambda x: mrcnn_bbox_loss_graph(*x),
name="mrcnn_bbox_loss")([
target_bbox, target_class_ids, mrcnn_bbox
])
mask_loss = KL.Lambda(lambda x: mrcnn_mask_loss_graph(*x),
name="mrcnn_mask_loss")([
target_mask, target_class_ids, mrcnn_mask
])
# Model
inputs = [
input_image, input_image_meta, input_rpn_match, input_rpn_bbox,
input_gt_class_ids, input_gt_boxes, input_gt_masks
]
if not config.USE_RPN_ROIS:
inputs.append(input_rois)
outputs = [
rpn_class_logits, rpn_class, rpn_bbox, mrcnn_class_logits,
mrcnn_class, mrcnn_bbox, mrcnn_mask, rpn_rois, output_rois,
rpn_class_loss, rpn_bbox_loss, class_loss, bbox_loss, mask_loss
]
model = KM.Model(inputs, outputs, name='mask_rcnn')
else:
# Network Heads
# Proposal classifier and BBox regressor heads
mrcnn_class_logits, mrcnn_class, mrcnn_bbox = \
panet_fpn_classifier_graph(rpn_rois, mrcnn_feature_maps, input_image_meta,
config.POOL_SIZE, config.NUM_CLASSES,
train_bn=config.TRAIN_BN,
fc_layers_size=config.FPN_CLASSIF_FC_LAYERS_SIZE)
# Detections
# output is [batch, num_detections, (y1, x1, y2, x2, class_id, score)] in
# normalized coordinates
detections = DetectionLayer(config, name="mrcnn_detection")(
[rpn_rois, mrcnn_class, mrcnn_bbox, input_image_meta])
# Create masks for detections
detection_boxes = KL.Lambda(lambda x: x[..., :4])(detections)
mrcnn_mask = panet_build_fpn_mask_graph(detection_boxes,
mrcnn_feature_maps,
input_image_meta,
config.MASK_POOL_SIZE,
config.NUM_CLASSES,
train_bn=config.TRAIN_BN)
model = KM.Model([input_image, input_image_meta, input_anchors], [
detections, mrcnn_class, mrcnn_bbox, mrcnn_mask, rpn_rois,
rpn_class, rpn_bbox
],
name='mask_rcnn')
# Add multi-GPU support.
if config.GPU_COUNT > 1:
from .parallel_model import ParallelModel
model = ParallelModel(model, config.GPU_COUNT)
return model
def build_model(self):
def kernel_convolution(net):
out = tf.nn.depthwise_conv2d(net,
self.kernel,
strides=[1, 1, 1, 1],
padding='SAME')
out = layers.Activation('sigmoid', name='local')(out)
return out
def conv_block(net,
depth_ksize=3,
depth_strides=1,
conv_filters=16,
conv_ksize=1,
conv_strides=1):
shortcut = net
net = layers.DepthwiseConv2D(
kernel_size=depth_ksize,
strides=depth_strides,
kernel_regularizer=tf.keras.regularizers.l1(0.01),
padding='same')(net)
net = layers.Conv2D(
filters=conv_filters,
kernel_size=conv_ksize,
strides=conv_strides,
kernel_regularizer=tf.keras.regularizers.l1(0.01),
padding='same')(net)
net = layers.Add()([shortcut, net])
net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1,
2])(net)
return net
def branch_block(net,
depth_ksize=3,
depth_strides=2,
conv_filters=16,
conv_ksize=1,
conv_strides=1,
pad=True):
branch_1 = layers.DepthwiseConv2D(
kernel_size=depth_ksize,
strides=depth_strides,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
branch_1 = layers.Conv2D(
filters=conv_filters,
kernel_size=conv_ksize,
strides=conv_strides,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(branch_1)
branch_2 = layers.MaxPooling2D(pool_size=2)(net)
if pad:
branch_2 = tf.pad(branch_2,
paddings=[[0, 0], [0, 0], [0, 0],
[0, int(conv_filters / 2)]],
mode='CONSTANT',
constant_values=0)
net = layers.Add()([branch_1, branch_2])
net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1,
2])(net)
return net
def boundary_generator(input_img):
# per image standardization
img = layers.Lambda(
lambda x: tf.image.per_image_standardization(x))(input_img)
# downsample a bit
net = layers.Conv2D(
filters=16,
kernel_size=3,
strides=2,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(img)
net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1,
2])(net)
net = layers.Dropout(rate=self.dropout_rate)(net)
# (48 48 16)
net = layers.Conv2D(
filters=32,
kernel_size=3,
strides=2,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1,
2])(net)
net = layers.Dropout(rate=self.dropout_rate)(net)
# (24 24 32)
shortcut = net
net = layers.DepthwiseConv2D(
kernel_size=3,
strides=1,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
net = layers.Conv2D(
64,
kernel_size=1,
strides=1,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
# net = layers.Add()([shortcut, net])
net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1,
2])(net)
net = layers.Dropout(rate=self.dropout_rate)(net)
shortcut = net
net = layers.DepthwiseConv2D(
kernel_size=3,
strides=1,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
net = layers.Conv2D(
128,
kernel_size=1,
strides=1,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
# net = layers.Add()([shortcut, net])
# net = layers.ReLU()(net)
net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1,
2])(net)
net = layers.Dropout(rate=self.dropout_rate)(net)
shortcut = net
net = layers.DepthwiseConv2D(
kernel_size=3,
strides=1,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
net = layers.Conv2D(
128,
kernel_size=1,
strides=1,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
net = layers.Add()([shortcut, net])
net = layers.ReLU()(net)
net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1,
2])(net)
net = layers.Dropout(rate=self.dropout_rate)(net)
shortcut = net
net = layers.DepthwiseConv2D(
kernel_size=3,
strides=1,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
net = layers.Conv2D(
128,
kernel_size=1,
strides=1,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
net = layers.Add()([shortcut, net])
net = layers.ReLU()(net)
net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1,
2])(net)
net = layers.Dropout(rate=self.dropout_rate)(net)
shortcut = net
net = layers.DepthwiseConv2D(
kernel_size=3,
strides=1,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
net = layers.Conv2D(
128,
kernel_size=1,
strides=1,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
net = layers.Add()([shortcut, net])
net = layers.ReLU()(net)
net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1,
2])(net)
net = layers.Dropout(rate=self.dropout_rate)(net)
shortcut = net
net = layers.DepthwiseConv2D(
kernel_size=3,
strides=1,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
net = layers.Conv2D(
128,
kernel_size=1,
strides=1,
padding='same',
kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
net = layers.Add()([shortcut, net])
# net = layers.ReLU()(net)
net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1,
2])(net)
net = layers.Dropout(rate=self.dropout_rate)(net)
# shortcut = net
# net = layers.DepthwiseConv2D(kernel_size=3, strides=1, padding='same',
# kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
# net = layers.Conv2D(128, kernel_size=1, strides=1, padding='same',
# kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
# net = layers.Add()([shortcut, net])
# net = layers.ReLU()(net)
# net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1, 2])(net)
# net = layers.Dropout(rate=self.dropout_rate)(net)
#
# shortcut = net
# net = layers.DepthwiseConv2D(kernel_size=3, strides=1, padding='same',
# kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
# net = layers.Conv2D(128, kernel_size=1, strides=1, padding='same',
# kernel_regularizer=tf.keras.regularizers.l1(0.01))(net)
# net = layers.Add()([shortcut, net])
# # net = layers.ReLU()(net)
# net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1, 2])(net)
# net = layers.Dropout(rate=self.dropout_rate)(net)
# transposes
net = layers.Conv2DTranspose(filters=64,
kernel_size=3,
strides=2,
padding='same',
output_padding=1,
use_bias=False)(net)
net = layers.BatchNormalization(momentum=0.99)(net)
net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1,
2])(net)
# net = layers.ReLU()(net)
net = layers.Conv2DTranspose(filters=32,
kernel_size=3,
strides=2,
padding='same',
output_padding=1,
use_bias=False)(net)
net = layers.BatchNormalization(momentum=0.99)(net)
net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1,
2])(net)
out = layers.Conv2D(self.num_boundaries,
kernel_size=1,
strides=1,
padding='same')(net)
# out = kernel_convolution(out)
return out
def landmark_regressor(inputs):
dropout_rate = 0.5
net = layers.Conv2D(filters=32,
kernel_size=3,
strides=2,
padding='same')(inputs) # (48, 48, 32)
net = layers.PReLU(alpha_initializer='zeros', shared_axes=[1,
2])(net)
net = layers.Dropout(rate=dropout_rate)(net)
net = conv_block(net, conv_filters=32)
net = branch_block(net, depth_strides=2,
conv_filters=64) # (24, 24, 64)
net = layers.Dropout(rate=dropout_rate)(net)
net = conv_block(net, conv_filters=64)
net = branch_block(net, depth_strides=2,
conv_filters=128) # (12, 12, 128)
net = layers.Dropout(rate=dropout_rate)(net)
net = conv_block(net, conv_filters=128)
net = branch_block(net,
depth_strides=2,
conv_filters=128,
pad=False) # (6, 6, 128)
net = layers.Dropout(rate=dropout_rate)(net)
net = conv_block(net, conv_filters=128)
net = branch_block(net,
depth_strides=2,
conv_filters=128,
pad=False) # (3, 3, 128)
net = layers.Dropout(rate=dropout_rate)(net)
net = layers.GlobalAveragePooling2D()(net) # (128)
net = layers.Dense(128, activation='relu')(net)
net = layers.Dense(128, activation='relu')(net)
net = layers.Dense(self.num_landmarks * 2,
activation='linear')(net)
return tf.reshape(net, [-1, self.num_landmarks, 2],
name='landmark')
def effectiveness_discriminator(input_img):
# (96, 96, 11)
net = layers.Conv2D(filters=32,
kernel_size=3,
strides=2,
padding='same')(input_img) # (48, 48, 32)
net = layers.LeakyReLU()(net)
net = layers.Dropout(rate=self.dropout_rate)(net)
net = layers.Conv2D(filters=64,
kernel_size=3,
strides=2,
padding='same')(net) # (24, 24, 64)
net = layers.LeakyReLU()(net)
net = layers.Dropout(rate=self.dropout_rate)(net)
net = layers.Conv2D(filters=64,
kernel_size=3,
strides=2,
padding='same')(net) # (12, 12, 64)
net = layers.LeakyReLU()(net)
net = layers.Dropout(rate=self.dropout_rate)(net)
net = layers.Conv2D(filters=64,
kernel_size=3,
strides=2,
padding='same')(net) # (6, 6, 64)
net = layers.LeakyReLU()(net)
net = layers.Dropout(rate=self.dropout_rate)(net)
net = layers.Conv2D(filters=64,
kernel_size=3,
strides=2,
padding='same')(net) # (3, 3, 64)
net = layers.LeakyReLU()(net)
net = layers.Dropout(rate=self.dropout_rate)(net)
net = layers.Conv2D(filters=64, kernel_size=3)(net) # (1, 1, 64)
net = layers.Flatten()(net) # (64)
logit = layers.Dense(1, activation='sigmoid',
name='logit')(net) # (1)
return logit
def input_image_fusion(x, bm_):
x_s = tf.reduce_sum(x, -1)
temp = tf.tile(
tf.reshape(
x_s, (-1, self.config.img_size, self.config.img_size, 1)),
[1, 1, 1, 11])
fused_img_ = temp * tf.image.resize(
bm_, (self.config.img_size, self.config.img_size))
x_s = tf.reshape(
x_s, (-1, self.config.img_size, self.config.img_size, 1))
fused_img_ = tf.concat([x_s, fused_img_], -1)
return fused_img_
def input_coordinate_fusion(bm_):
coord = tf.linspace(0.0, self.config.img_size - 1.0,
self.config.img_size)
x_coord = tf.tile(
tf.reshape(coord, [1, 1, self.config.img_size, 1]),
[self.config.batch_size, self.config.img_size, 1, 11])
y_coord = tf.tile(
tf.reshape(coord, [1, self.config.img_size, 1, 1]),
[self.config.batch_size, 1, self.config.img_size, 11])
x_coord_bm_ = bm_ * x_coord
y_coord_bm_ = bm_ * y_coord
return x_coord_bm_, y_coord_bm_
input_img = layers.Input((self.config.img_size, self.config.img_size,
self.config.n_channel))
boundary = boundary_generator(input_img)
self.generator = tf.keras.Model(inputs=input_img,
outputs=boundary,
name='boundary_generator')
input_boundary = layers.Input(
(self.config.img_size, self.config.img_size, self.num_boundaries))
fused_img = input_image_fusion(input_img, input_boundary)
landmark = landmark_regressor(fused_img)
self.regressor = tf.keras.Model(inputs=[input_img, input_boundary],
outputs=landmark,
name='landmark_regressor')
predicted_boundary = layers.Input(
(self.config.img_size, self.config.img_size, self.num_boundaries))
logit = effectiveness_discriminator(predicted_boundary)
self.discriminator = tf.keras.Model(inputs=predicted_boundary,
outputs=logit,
name='effectiveness_discriminator')
logit = self.discriminator(boundary)
self.gen_and_disc = tf.keras.Model(inputs=input_img,
outputs=logit,
name='generator_and_discriminator')
self.generator.summary()
self.regressor.summary()
self.discriminator.summary()
def MXM_2D(inputs,filters):
input_shape = inputs.shape[1:].as_list()
input_tensor = L.Input(shape=input_shape)
x0 = L.Conv2D(filters,(1,1),padding='same',activation='linear')(input_tensor)
x1 = L.Conv2D(filters,(3,3),padding='same',activation='linear')(input_tensor)
# x2 = L.Conv2D(filters,(3,3),padding='same',activation='linear')(input_tensor)
# x3 = L.Conv2D(filters,(3,3),padding='same',activation='linear')(x2)
x = L.Concatenate()([x0,x1])
# x = L.Maximum()([x0,x1])
x = L.ReLU()(x)
model = keras.Model(inputs=input_tensor, outputs=x)
return model
#%%
input_shape = [SIZE_SUB*SIZE_TOP,SIZE_SUB*SIZE_TOP,3]
inputs1 = L.Input(shape=input_shape)
x = inputs1
mask = L.Lambda(build_mask,[SIZE_SUB*SIZE_TOP,SIZE_SUB*SIZE_TOP])(inputs1)
mask = L.Lambda(K.expand_dims,name = 'expend')(mask)
mask1 = L.Lambda(K.tile, arguments={'n':(1, 1, 1, 50)},name='tile')(mask)
x0 = MXM_2D(x,64)(x)
x1 = L.MaxPool2D(pool_size=(SIZE_SUB,SIZE_SUB),strides=(SIZE_SUB,SIZE_SUB),padding='valid')(x0)
x1 = MXM_2D(x1,128)(x1)
x2 = L.MaxPool2D(pool_size=(SIZE_TOP,SIZE_TOP),strides=(SIZE_TOP,SIZE_TOP),padding='valid')(x1)
xg = x2
xg = L.Dense(256,activation='relu')(xg)
def EfficientNet(width_coefficient,
depth_coefficient,
default_resolution,
dropout_rate=0.2,
drop_connect_rate=0.2,
depth_divisor=8,
blocks_args=DEFAULT_BLOCKS_ARGS,
model_name='efficientnet',
include_top=True,
weights='imagenet',
input_tensor=None,
input_shape=None,
pooling=None,
classes=1000,
freeze_bn=False,
**kwargs):
features = []
if input_tensor is None:
img_input = layers.Input(shape=input_shape)
else:
img_input = input_tensor
bn_axis = 3
activation = get_swish(**kwargs)
# Build stem
x = img_input
x = layers.Conv2D(round_filters(32, width_coefficient, depth_divisor),
3,
strides=(2, 2),
padding='same',
use_bias=False,
kernel_initializer=CONV_KERNEL_INITIALIZER,
name='stem_conv')(x)
x = layers.BatchNormalization(axis=bn_axis, name='stem_bn')(x)
x = layers.Activation(activation, name='stem_activation')(x)
# Build blocks
num_blocks_total = sum(block_args.num_repeat for block_args in blocks_args)
block_num = 0
for idx, block_args in enumerate(blocks_args):
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,
width_coefficient, depth_divisor),
output_filters=round_filters(block_args.output_filters,
width_coefficient, depth_divisor),
num_repeat=round_repeats(block_args.num_repeat, depth_coefficient))
# The first block needs to take care of stride and filter size increase.
drop_rate = drop_connect_rate * float(block_num) / num_blocks_total
x = mb_conv_block(x,
block_args,
activation=activation,
drop_rate=drop_rate,
prefix='block{}a_'.format(idx + 1),
freeze_bn=freeze_bn)
block_num += 1
if block_args.num_repeat > 1:
# pylint: disable=protected-access
block_args = block_args._replace(
input_filters=block_args.output_filters, strides=[1, 1])
# pylint: enable=protected-access
for bidx in xrange(block_args.num_repeat - 1):
drop_rate = drop_connect_rate * float(
block_num) / num_blocks_total
block_prefix = 'block{}{}_'.format(
idx + 1, string.ascii_lowercase[bidx + 1])
x = mb_conv_block(x,
block_args,
activation=activation,
drop_rate=drop_rate,
prefix=block_prefix,
freeze_bn=freeze_bn)
block_num += 1
if idx < len(blocks_args) - 1 and blocks_args[idx + 1].strides[0] == 2:
features.append(x)
elif idx == len(blocks_args) - 1:
features.append(x)
return features
def build_1d_model(args):
l2r = 1e-9
T, X = tfkl.Input((N_TOKS,)), tfkl.Input((MAX_OBJS, 3 + N_OBJS))
# print('T: ', T.shape)
# print('X: ', X.shape)
ti = tfkl.Embedding(N_VOCAB, N_EMBED, input_length=N_TOKS)(T)
# print('ti :', ti.shape)
th = tfkm.Sequential([
tfkl.Bidirectional(tfkl.LSTM(128, return_sequences=True)),
tfkl.Bidirectional(tfkl.LSTM(128, return_sequences=True)),
tfkl.Conv1D(256, (1,), activation='elu', kernel_regularizer=tfkr.l2(l2r)),
tfkl.Conv1D(6, (1,), activation=None, kernel_regularizer=tfkr.l2(l2r)),
tfkl.Softmax(axis=-2, name='lstm_attn'),
], name='lstm_layers')(ti)
# print('th: ', th.shape)
tia = tfkb.sum(tfkl.Reshape((N_TOKS, 1, -1))(th) * tfkl.Reshape((N_TOKS, N_EMBED, 1))(ti), axis=-3)
# print('tia: ', tia.shape)
Xi = tfkb.sum(X[:, :, 3:], axis=-1, keepdims=True)
# print('Xi: ', Xi.shape)
s1 = tfkl.Dense(N_OBJS, activation='softmax')(tia[:, :, 0])
s1b = tfkm.Sequential([tfkl.RepeatVector(MAX_OBJS), tfkl.Reshape((MAX_OBJS, N_OBJS))])(s1)
Xs1 = tfkb.sum(X[:, :, 3:] * s1b, axis=-1, keepdims=True)
# print('s1: ', s1.shape)
# print('s1b: ', s1b.shape)
# print('Xs1: ', Xs1.shape)
s2 = tfkl.Dense(3)(tia[:, :, 1])
s2b = tfkm.Sequential([tfkl.RepeatVector(MAX_OBJS), tfkl.Reshape((MAX_OBJS, 3))])(s2)
s2c = tfkb.sum(s2b * X[:, :, 2:3] - (1 - Xi) * 20, axis=-1, keepdims=True)
Xs2 = tfkm.Sequential([tfkl.Reshape((-1, 1)), tfkl.Softmax(axis=-2), tfkl.Reshape((MAX_OBJS, 1))])(s2c)
Xs2 = Xs2 - tfkb.max(Xs2, axis=[1, 2], keepdims=True)
# print('Xs2: ', Xs2.shape)
s3 = tfkl.Dense(N_OBJS, activation='softmax')(tia[:, :, 2])
s3b = tfkm.Sequential([tfkl.RepeatVector(MAX_OBJS), tfkl.Reshape((MAX_OBJS, N_OBJS))])(s3)
Xs3 = tfkb.sum(X[:, :, 3:] * s3b, axis=-1, keepdims=True)
s4 = tfkl.Dense(16, activation='softmax')(tia[:, :, 3])
s4b = tfkm.Sequential([tfkl.RepeatVector(MAX_OBJS), tfkl.Reshape((MAX_OBJS, 16))])(s4)
Xs4 = s4b * Xi
# print('Xs4: ', Xs2.shape)
s5 = tfkl.Dense(16, activation='softmax')(tia[:, :, 4])
s5b = tfkm.Sequential([tfkl.RepeatVector(MAX_OBJS), tfkl.Reshape((MAX_OBJS, 16))])(s5)
Xs5 = s5b * Xi
s6 = tfkl.Dense(16, activation='softmax')(tia[:, :, 5])
s6b = tfkm.Sequential([tfkl.RepeatVector(MAX_OBJS), tfkl.Reshape((MAX_OBJS, 16))])(s6)
Xs6 = s6b * Xi
xt = tfkl.concatenate([Xi, Xs1, Xs2, Xs3, Xs4, Xs5, Xs6], axis=-1)
# print('xt: ', xt.shape)
attn = fcnet(xt)
# print('attn: ', attn.shape)
Y = tfkb.sum(attn * X[:, :, :2], axis=[1])
# print('Y: ', Y.shape)
model = tfkm.Model(inputs=[T, X], outputs=[Y])
def acc(y_pred, y_true):
return tfkb.mean(tfkb.min(tfkb.cast((tfkb.abs(y_true-y_pred) < args.tol), 'float32'), axis=1))
model.compile(tfk.optimizers.Adam(args.lr), 'mse', metrics=[acc])
return model
"""## Building a Small Convnet from Scratch to Get to 72% Accuracy
The images that will go into our convnet are 150x150 color images (in the next section on Data Preprocessing, we'll add handling to resize all the images to 150x150 before feeding them into the neural network).
Let's code up the architecture. We will stack 3 {convolution + relu + maxpooling} modules. Our convolutions operate on 3x3 windows and our maxpooling layers operate on 2x2 windows. Our first convolution extracts 16 filters, the following one extracts 32 filters, and the last one extracts 64 filters.
**NOTE**: This is a configuration that is widely used and known to work well for image classification. Also, since we have relatively few training examples (1,000), using just three convolutional modules keeps the model small, which lowers the risk of overfitting (which we'll explore in more depth in Exercise 2.)
"""
from tensorflow.keras import layers
from tensorflow.keras import Model
# Our input feature map is 150x150x3: 150x150 for the image pixels, and 3 for
# the three color channels: R, G, and B
img_input = layers.Input(shape=(32, 32, 3))
# First convolution extracts 16 filters that are 3x3
# Convolution is followed by max-pooling layer with a 2x2 window
x = layers.Conv2D(16, 3, activation='relu')(img_input)
x = layers.MaxPooling2D(2)(x)
# Second convolution extracts 32 filters that are 3x3
# Convolution is followed by max-pooling layer with a 2x2 window
x = layers.Conv2D(32, 3, activation='relu')(x)
x = layers.MaxPooling2D(2)(x)
# Third convolution extracts 64 filters that are 3x3
# Convolution is followed by max-pooling layer with a 2x2 window
x = layers.Conv2D(64, 3, activation='relu')(x)
x = layers.MaxPooling2D(2)(x)
# including sgd (stochastic gradient
#from CustLoss_MSE import cust_mean_squared_error # note that in this loss function, the axis of the MSE is set to 1
from CustLoss_MSE import cust_mean_squared_error # note that in this loss function, the axis of the MSE is set to 1
from CustMet_cosine_distance_angular import cos_distmet_2D_angular
# specify parameters
modelname = 'CNN_sum_K-32-32-64-128_KS-37-37-37-37_MP-12-22-22-32_DO-2-2-2-2-2_MSE'
time_sound = 750 # input dimension 1 (time)
nfreqs = 99 # input dimension 2 (frequencies)
#------------------------------------------------------------------------------
# Define model architecture
#------------------------------------------------------------------------------
# CNN 1 - left channel
in1 = layers.Input(
shape=(time_sound, nfreqs,
1)) # define input (rows, columns, channels (only one in my case))
model_l_conv1 = layers.Conv2D(32, (3, 7), activation='relu', padding='same')(
in1) # define first layer and input to the layer
model_l_conv1_mp = layers.MaxPooling2D(pool_size=(1, 2))(model_l_conv1)
model_l_conv1_mp_do = layers.Dropout(0.2)(model_l_conv1_mp)
# CNN 1 - right channel
in2 = layers.Input(shape=(time_sound, nfreqs, 1)) # define input
model_r_conv1 = layers.Conv2D(32, (3, 7), activation='relu', padding='same')(
in2) # define first layer and input to the layer
model_r_conv1_mp = layers.MaxPooling2D(pool_size=(1, 2))(model_r_conv1)
model_r_conv1_mp_do = layers.Dropout(0.2)(model_r_conv1_mp)
# CNN 2 - merged
model_final_merge = layers.Add()([model_l_conv1_mp_do, model_r_conv1_mp_do])