def CompoundNet_VGG19(include_top=True,
weights=None,
input_tensor=None,
input_shape=None,
fusion_strategy='concatenate',
mode='fine_tuning',
pooling_mode='avg',
classes=9,
data_augm_enabled=False):
"""Instantiates the CompoundNet VGG19 architecture fine-tuned (2 steps) on Human Rights Archive dataset.
Optionally loads weights pre-trained on Human Rights Archive Database.
# Arguments
include_top: whether to include the 3 fully-connected
layers at the top of the network.
weights: one of `None` (random initialization),
'HRA' (pre-training on Human Rights Archive),
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 input channels,
and width and height should be no smaller than 48.
E.g. `(200, 200, 3)` would be one valid value.
fusion_strategy: one of `concatenate` (feature vectors of different sources are concatenated into one super-vector),
`average` (the feature set is averaged)
or `maximum` (selects the highest value from the corresponding features).
mode: one of `feature_extraction` (freeze all but the penultimate layer and re-train the last Dense layer)
or `fine_tuning` (unfreeze the lower convolutional layers and retrain more layers).
pooling_mode: Optional pooling_mode 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_mode
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_mode will
be applied.
classes: optional number of classes to classify images into,
only to be specified if `weights` argument is `None`.
data_augm_enabled: whether to use the augmented samples during training.
# Returns
A Keras model instance.
# Raises
ValueError: in case of invalid argument for `weights`.
"""
if not (weights in {'HRA', None} or os.path.exists(weights)):
raise ValueError('The `weights` argument should be either '
'`None` (random initialization), `HRA` '
'(pre-training on Human Rights Archive), '
'or the path to the weights file to be loaded.')
if not (fusion_strategy in {'concatenate', 'average', 'maximum'}):
raise ValueError(
'The `fusion_strategy` argument should be either '
'`concatenate` (feature vectors of different sources are concatenated into one super-vector), '
'`average` (the feature set is averaged) '
'or `maximum` (selects the highest value from the corresponding features).'
)
if not (pooling_mode in {'avg', 'max', 'flatten'}):
raise ValueError('The `pooling_mode` argument should be either '
'`avg` (GlobalAveragePooling2D), `max` '
'(GlobalMaxPooling2D), '
'or `flatten` (Flatten).')
if weights == 'HRA' and classes != 9:
raise ValueError(
'If using `weights` as Human Rights Archive, `classes` should be 9.'
)
cache_subdir = 'HRA_models'
# Determine proper input shape
input_shape = _obtain_input_shape(input_shape,
default_size=224,
min_size=48,
data_format=K.image_data_format(),
require_flatten=include_top,
weights=weights)
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not K.is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
input_tensor = Input(shape=(224, 224, 3))
object_centric_model = VGG19(input_tensor=input_tensor,
weights='imagenet',
include_top=False)
scene_centric_model = VGG16_Places365(input_tensor=input_tensor,
weights='places',
include_top=False)
# retrieve the ouputs
object_model_output = object_centric_model.output
scene_model_output = scene_centric_model.output
# We will feed the extracted features to a merging layer
if fusion_strategy == 'concatenate':
merged = concatenate([object_model_output, scene_model_output])
elif fusion_strategy == 'average':
merged = average([object_model_output, scene_model_output])
else:
merged = maximum([object_model_output, scene_model_output])
if include_top:
if pooling_mode == 'avg':
x = GlobalAveragePooling2D(name='GAP')(merged)
elif pooling_mode == 'max':
x = GlobalMaxPooling2D(name='GMP')(merged)
elif pooling_mode == 'flatten':
x = Flatten(name='FLATTEN')(merged)
x = Dense(256, activation='relu',
name='FC1')(x) # let's add a fully-connected layer
# When random init is enabled, we want to include Dropout,
# otherwise when loading a pre-trained HRA model we want to omit
# Dropout layer so the visualisations are done properly (there is an issue if it is included)
if weights is None:
x = Dropout(0.5, name='DROPOUT')(x)
# and a logistic layer with the number of classes defined by the `classes` argument
x = Dense(classes, activation='softmax',
name='PREDICTIONS')(x) # new softmax layer
# Ensure that the model takes into account any potential predecessors of `input_tensor`.
if input_tensor is not None:
inputs = get_source_inputs(input_tensor)
else:
inputs = img_input
# this is the transfer learning model we will train
model = Model(inputs=inputs, outputs=x, name='CompoundNet-VGG19')
# load weights
if weights == 'HRA':
if include_top:
if mode == 'feature_extraction':
for layer in object_centric_model.layers:
layer.trainable = False
for layer in scene_centric_model.layers:
layer.trainable = False
model.compile(optimizer=SGD(lr=0.0001, momentum=0.9),
loss='categorical_crossentropy')
if data_augm_enabled:
if fusion_strategy == 'concatenate':
if pooling_mode == 'avg':
weights_path = get_file(
AUGM_FEATURE_EXTRACTION_CONCATENATE_FUSION_AVG_POOL_fname,
AUGM_FEATURE_EXTRACTION_CONCATENATE_FUSION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
AUGM_FEATURE_EXTRACTION_CONCATENATE_FUSION_FLATTEN_fname,
AUGM_FEATURE_EXTRACTION_CONCATENATE_FUSION_FLATTEN_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
AUGM_FEATURE_EXTRACTION_CONCATENATE_FUSION_MAX_POOL_fname,
AUGM_FEATURE_EXTRACTION_CONCATENATE_FUSION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif fusion_strategy == 'average':
if pooling_mode == 'avg':
weights_path = get_file(
AUGM_FEATURE_EXTRACTION_AVERAGE_FUSION_AVG_POOL_fname,
AUGM_FEATURE_EXTRACTION_AVERAGE_FUSION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
AUGM_FEATURE_EXTRACTION_AVERAGE_FUSION_FLATTEN_fname,
AUGM_FEATURE_EXTRACTION_AVERAGE_FUSION_FLATTEN_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
AUGM_FEATURE_EXTRACTION_AVERAGE_FUSION_MAX_POOL_fname,
AUGM_FEATURE_EXTRACTION_AVERAGE_FUSION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif fusion_strategy == 'maximum':
if pooling_mode == 'avg':
weights_path = get_file(
AUGM_FEATURE_EXTRACTION_MAXIMUM_FUSION_AVG_POOL_fname,
AUGM_FEATURE_EXTRACTION_MAXIMUM_FUSION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
AUGM_FEATURE_EXTRACTION_MAXIMUM_FUSION_FLATTEN_fname,
AUGM_FEATURE_EXTRACTION_MAXIMUM_FUSION_FLATTEN_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
AUGM_FEATURE_EXTRACTION_MAXIMUM_FUSION_MAX_POOL_fname,
AUGM_FEATURE_EXTRACTION_MAXIMUM_FUSION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
else:
if fusion_strategy == 'concatenate':
if pooling_mode == 'avg':
weights_path = get_file(
FEATURE_EXTRACTION_CONCATENATE_FUSION_AVG_POOL_fname,
FEATURE_EXTRACTION_CONCATENATE_FUSION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
FEATURE_EXTRACTION_CONCATENATE_FUSION_FLATTEN_fname,
FEATURE_EXTRACTION_CONCATENATE_FUSION_FLATTEN_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
FEATURE_EXTRACTION_CONCATENATE_FUSION_MAX_POOL_fname,
FEATURE_EXTRACTION_CONCATENATE_FUSION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif fusion_strategy == 'average':
if pooling_mode == 'avg':
weights_path = get_file(
FEATURE_EXTRACTION_AVERAGE_FUSION_AVG_POOL_fname,
FEATURE_EXTRACTION_AVERAGE_FUSION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
FEATURE_EXTRACTION_AVERAGE_FUSION_FLATTEN_fname,
FEATURE_EXTRACTION_AVERAGE_FUSION_FLATTEN_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
FEATURE_EXTRACTION_AVERAGE_FUSION_MAX_POOL_fname,
FEATURE_EXTRACTION_AVERAGE_FUSION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif fusion_strategy == 'maximum':
if pooling_mode == 'avg':
weights_path = get_file(
FEATURE_EXTRACTION_MAXIMUM_FUSION_AVG_POOL_fname,
FEATURE_EXTRACTION_MAXIMUM_FUSION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
FEATURE_EXTRACTION_MAXIMUM_FUSION_FLATTEN_fname,
FEATURE_EXTRACTION_MAXIMUM_FUSION_FLATTEN_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
FEATURE_EXTRACTION_MAXIMUM_FUSION_MAX_POOL_fname,
FEATURE_EXTRACTION_MAXIMUM_FUSION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif mode == 'fine_tuning':
for layer in model.layers[:36]:
layer.trainable = False
for layer in model.layers[36:]:
layer.trainable = True
model.compile(optimizer=SGD(lr=0.0001, momentum=0.9),
loss='categorical_crossentropy')
if data_augm_enabled:
if fusion_strategy == 'concatenate':
if pooling_mode == 'avg':
weights_path = get_file(
AUGM_FINE_TUNING_CONCATENATE_FUSION_AVG_POOL_fname,
AUGM_FINE_TUNING_CONCATENATE_FUSION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
AUGM_FINE_TUNING_CONCATENATE_FUSION_FLATTEN_fname,
AUGM_FINE_TUNING_CONCATENATE_FUSION_FLATTEN_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
AUGM_FINE_TUNING_CONCATENATE_FUSION_MAX_POOL_fname,
AUGM_FINE_TUNING_CONCATENATE_FUSION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif fusion_strategy == 'average':
if pooling_mode == 'avg':
weights_path = get_file(
AUGM_FINE_TUNING_AVERAGE_FUSION_AVG_POOL_fname,
AUGM_FINE_TUNING_AVERAGE_FUSION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
AUGM_FINE_TUNING_AVERAGE_FUSION_FLATTEN_fname,
AUGM_FINE_TUNING_AVERAGE_FUSION_FLATTEN_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
AUGM_FINE_TUNING_AVERAGE_FUSION_MAX_POOL_fname,
AUGM_FINE_TUNING_AVERAGE_FUSION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif fusion_strategy == 'maximum':
if pooling_mode == 'avg':
weights_path = get_file(
AUGM_FINE_TUNING_MAXIMUM_FUSION_AVG_POOL_fname,
AUGM_FINE_TUNING_MAXIMUM_FUSION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
AUGM_FINE_TUNING_MAXIMUM_FUSION_FLATTEN_fname,
AUGM_FINE_TUNING_MAXIMUM_FUSION_FLATTEN_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
AUGM_FINE_TUNING_MAXIMUM_FUSION_MAX_POOL_fname,
AUGM_FINE_TUNING_MAXIMUM_FUSION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
else:
if fusion_strategy == 'concatenate':
if pooling_mode == 'avg':
weights_path = get_file(
FINE_TUNING_CONCATENATE_FUSION_AVG_POOL_fname,
FINE_TUNING_CONCATENATE_FUSION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
FINE_TUNING_CONCATENATE_FUSION_FLATTEN_fname,
FINE_TUNING_CONCATENATE_FUSION_FLATTEN_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
FINE_TUNING_CONCATENATE_FUSION_MAX_POOL_fname,
FINE_TUNING_CONCATENATE_FUSION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif fusion_strategy == 'average':
if pooling_mode == 'avg':
weights_path = get_file(
FINE_TUNING_AVERAGE_FUSION_AVG_POOL_fname,
FINE_TUNING_AVERAGE_FUSION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
FINE_TUNING_AVERAGE_FUSION_FLATTEN_fname,
FINE_TUNING_AVERAGE_FUSION_FLATTEN_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
FINE_TUNING_AVERAGE_FUSION_MAX_POOL_fname,
FINE_TUNING_AVERAGE_FUSION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif fusion_strategy == 'maximum':
if pooling_mode == 'avg':
weights_path = get_file(
FINE_TUNING_MAXIMUM_FUSION_AVG_POOL_fname,
FINE_TUNING_MAXIMUM_FUSION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
FINE_TUNING_MAXIMUM_FUSION_FLATTEN_fname,
FINE_TUNING_MAXIMUM_FUSION_FLATTEN_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
FINE_TUNING_MAXIMUM_FUSION_MAX_POOL_fname,
FINE_TUNING_MAXIMUM_FUSION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
else:
if fusion_strategy == 'average':
weights_path = get_file(
FINE_TUNING_AVERAGE_FUSION_NO_TOP_fname,
FINE_TUNING_AVERAGE_FUSION_WEIGHTS_PATH_NO_TOP,
cache_subdir=cache_subdir)
elif fusion_strategy == 'concatenate':
weights_path = get_file(
FINE_TUNING_CONCATENATE_FUSION_NO_TOP_fname,
FINE_TUNING_CONCATENATE_FUSION_WEIGHTS_PATH_NO_TOP,
cache_subdir=cache_subdir)
elif fusion_strategy == 'maximum':
weights_path = get_file(
FINE_TUNING_MAXIMUM_FUSION_NO_TOP_fname,
FINE_TUNING_MAXIMUM_FUSION_WEIGHTS_PATH_NO_TOP,
cache_subdir=cache_subdir)
model.load_weights(weights_path)
return model
def __init__(self,
hdf5_file,
body_backbone_CNN,
image_backbone_CNN,
nb_of_epochs,
weights_to_file,
modelCheckpoint_quantity,
earlyStopping_quantity,
CSVLogger_filename):
if not (body_backbone_CNN in {'VGG16', 'VGG19', 'ResNet50', 'VGG16_Places365'}):
raise ValueError('The `body_backbone_CNN` argument should be either '
'`VGG16`, `VGG19`, `ResNet50` or `VGG16_Places365`. ')
if not (image_backbone_CNN in {'VGG16', 'VGG19', 'ResNet50', 'VGG16_Places365'}):
raise ValueError('The `image_backbone_CNN` argument should be either '
'`VGG16`, `VGG19`, `ResNet50` or `VGG16_Places365`. ')
self.body_backbone_CNN = body_backbone_CNN
self.image_backbone_CNN = image_backbone_CNN
# -------------------------------------------------------------------------------- #
# Construct EMOTIC model
# -------------------------------------------------------------------------------- #
body_inputs = Input(shape=(224, 224, 3), name='INPUT')
image_inputs = Input(shape=(224, 224, 3), name='INPUT')
# Body module
if 'VGG16' == body_backbone_CNN:
self.body_truncated_model = VGG16(include_top=False, weights='imagenet', input_tensor=body_inputs, pooling='avg')
elif 'VGG19' == body_backbone_CNN:
self.body_truncated_model = VGG19(include_top=False, weights='imagenet', input_tensor=body_inputs, pooling='avg')
elif 'ResNet50' == body_backbone_CNN:
tmp_model = ResNet50(include_top=False, weights='imagenet', input_tensor=body_inputs, pooling='avg')
self.body_truncated_model = Model(inputs=tmp_model.input, outputs=tmp_model.get_layer('activation_48').output)
elif 'VGG16_Places365' == body_backbone_CNN:
self.body_truncated_model = VGG16_Places365(include_top=False, weights='places', input_tensor=body_inputs, pooling='avg')
for layer in self.body_truncated_model.layers:
layer.name = str("body-") + layer.name
print('[INFO] The plain, body `' + body_backbone_CNN + '` pre-trained convnet was successfully initialised.')
# Image module
if 'VGG16' == image_backbone_CNN:
self.image_truncated_model = VGG16(include_top=False, weights='imagenet', input_tensor=image_inputs, pooling='avg')
elif 'VGG19' == image_backbone_CNN:
self.image_truncated_model = VGG19(include_top=False, weights='imagenet', input_tensor=image_inputs, pooling='avg')
elif 'ResNet50' == image_backbone_CNN:
tmp_model = ResNet50(include_top=False, weights='imagenet',input_tensor=image_inputs, pooling='avg')
self.image_truncated_model = Model(inputs=tmp_model.input, outputs=tmp_model.get_layer('activation_48').output)
elif 'VGG16_Places365' == image_backbone_CNN:
self.image_truncated_model = VGG16_Places365(include_top=False, weights='places', input_tensor=image_inputs, pooling='avg')
for layer in self.image_truncated_model.layers:
layer.name = str("image-") + layer.name
print('[INFO] The plain, image `' + image_backbone_CNN + '` pre-trained convnet was successfully initialised.')
# retrieve the ouputs
body_plain_model_output = self.body_truncated_model.output
image_plain_model_output = self.image_truncated_model.output
# In case ResNet50 is selected we need to use a global average pooling layer to follow the process used for the othe CNNs.
if 'ResNet50' == body_backbone_CNN:
body_plain_model_output = GlobalAveragePooling2D(name='GAP')(body_plain_model_output)
if 'ResNet50' == image_backbone_CNN:
image_plain_model_output = GlobalAveragePooling2D(name='GAP')(image_plain_model_output)
merged = concatenate([body_plain_model_output, image_plain_model_output])
x = Dense(256, activation='relu', name='FC1', kernel_regularizer=regularizers.l2(0.01), kernel_initializer='random_normal')(merged)
x = Dropout(0.5, name='DROPOUT')(x)
vad_cont_prediction = Dense(units=3, kernel_initializer='random_normal', name='VAD')(x)
# At model instantiation, you specify the two inputs and the output.
self.model = Model(inputs=[body_inputs, image_inputs], outputs=vad_cont_prediction, name='EMOTIC-VAD-regression')
print('[INFO] Randomly initialised classifier was successfully added on top of the merged modules.')
print('[INFO] Number of trainable weights before freezing the conv. bases of the respective original models: '
'' + str(len(self.model.trainable_weights)))
# first: train only the top layers (which were randomly initialized)
# i.e. freeze all convolutional layers of the preliminary base model
for layer in self.body_truncated_model.layers:
layer.trainable = False
for layer in self.image_truncated_model.layers:
layer.trainable = False
print('[INFO] Number of trainable weights after freezing the conv. bases of the respective original models: '
'' + str(len(self.model.trainable_weights)))
# # reference https://github.com/keras-team/keras/issues/4735#issuecomment-267472549
# self.class_weight = { 'VALENCE': {0: 36.00, 1: 36.00, 2: 12.00, 3: 5.14, 4: 2.25, 5: 1.00, 6: 1.89, 7: 2.57, 8: 12.00, 9: 36.00},
# 'AROUSAL': {0: 23.00, 1: 11.50, 2: 4.60, 3: 1.00, 4: 2.09, 5: 1.64, 6: 1.14, 7: 2.09, 8: 3.83, 9: 4.60},
# 'DOMINANCE': {0: 34.00, 1: 17.00, 2: 11.33, 3: 6.80, 4: 5.66, 5: 1.70, 6: 1.00, 7: 2.42, 8: 3.40, 9: 6.80}
# }
self.model.compile(optimizer=SGD(lr=1e-5, momentum=0.9),
# loss='mse',
loss = euclidean_distance_loss,
metrics=['mae','mse', rmse])
# print ('[INFO] Metrics names: ',self.model.metrics_names )
print('[INFO] End-to-end `EMOTIC-VAD-regression` model has been successfully compiled.')
# -------------------------------------------------------------------------------- #
# Configurations
# -------------------------------------------------------------------------------- #
nb_train_samples = 23706
nb_val_samples = 3332
nb_test_samples = 7280
train_generator_batch_size = 54
val_generator_batch_size = 49
test_generator_batch_size = 52
self.steps_per_epoch = nb_train_samples // train_generator_batch_size
self.validation_steps = nb_val_samples // val_generator_batch_size
self.test_steps = nb_test_samples // test_generator_batch_size
# -------------------------------------------------------------------------------- #
# Read the HDF5 file
# -------------------------------------------------------------------------------- #
# open the hdf5 file
hdf5_file = h5py.File(hdf5_file, "r")
self.nb_train_data = hdf5_file["x_image_train"].shape[0]
self.nb_val_data = hdf5_file["x_image_val"].shape[0]
self.nb_test_data = hdf5_file["x_image_test"].shape[0]
# -------------------------------------------------------------------------------- #
# Instantiate the custom generators
# -------------------------------------------------------------------------------- #
print('[INFO] Setting up custom generators...')
self.train_generator = custom_generator_single_output(hdf5_file=hdf5_file,
nb_data=self.nb_train_data,
batch_size=train_generator_batch_size,
mode='train')
self.val_generator = custom_generator_single_output(hdf5_file=hdf5_file,
nb_data=self.nb_val_data,
batch_size=val_generator_batch_size,
mode='val')
self.test_generator = custom_generator_single_output(hdf5_file=hdf5_file,
nb_data=self.nb_test_data,
batch_size=test_generator_batch_size,
mode='test')
# -------------------------------------------------------------------------------- #
# Usage of callbacks
# -------------------------------------------------------------------------------- #
self.weights_to_file = weights_to_file
self.nb_of_epochs = nb_of_epochs
# CSVLogger
model_log = 'trained_models/logs/' + CSVLogger_filename
csv_logger = CSVLogger(model_log, append=True, separator=',')
# ModelCheckpoint
checkpointer = ModelCheckpoint(filepath=weights_to_file,
monitor=modelCheckpoint_quantity,
verbose=1,
save_best_only=True,
mode='auto',
period=1,
save_weights_only=True)
early_stop = EarlyStopping(monitor=earlyStopping_quantity, patience=5, mode='auto')
self.callbacks_list = [checkpointer, early_stop, csv_logger]
def compoundNet_feature_extraction(object_centric_model='VGG16',
scene_centric_model='VGG16_Places365',
fusion_strategy='concatenate',
pooling_mode='avg',
classes=9,
data_augm_enabled=False):
"""ConvNet as fixed feature extractor, consist of taking the convolutional base of a previously-trained network,
running the new data through it, and training a new classifier on top of the output.
(i.e. train only the randomly initialized top layers while freezing all convolutional layers of the original model).
# Arguments
object_centric_model: one of `VGG16`, `VGG19` or `ResNet50`
scene_centric_model: `VGG16_Places365`
fusion_strategy: one of `concatenate` (feature vectors of different sources are concatenated into one super-vector),
`average` (the feature set is averaged) or `maximum` (selects the highest value from the corresponding features).
pooling_mode: Optional pooling_mode 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_mode
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_mode will
be applied.
classes: optional number of classes to classify images into,
only to be specified if `weights` argument is `None`.
data_augm_enabled: whether to use the augmented samples during training.
# Returns
A Keras model instance.
# Raises
ValueError: in case of invalid argument for `object_centric_model`, `pooling_mode`,
`fusion_strategy` , `scene_centric_model` or invalid input shape.
"""
if not (object_centric_model in {'VGG16', 'VGG19', 'ResNet50'}):
raise ValueError(
'The `scene_centric_model` argument should be either '
'`VGG16`, `VGG19` or `ResNet50`. Other models will be supported in future releases. '
)
if not (pooling_mode in {'avg', 'max', 'flatten'}):
raise ValueError('The `pooling_mode` argument should be either '
'`avg` (GlobalAveragePooling2D), `max` '
'(GlobalMaxPooling2D), '
'or `flatten` (Flatten).')
if not (fusion_strategy in {'concatenate', 'average', 'maximum'}):
raise ValueError(
'The `fusion_strategy` argument should be either '
'`concatenate` (feature vectors of different sources are concatenated into one super-vector),'
' `average` (the feature set is averaged) '
'or `maximum` (selects the highest value from the corresponding features).'
)
if not (scene_centric_model in {'VGG16_Places365'}):
raise ValueError(
'The `scene_centric_model` argument should be '
'`VGG16_Places365`. Other models will be supported in future releases.'
)
# Define the name of the model and its weights
weights_name = 'compoundNet_feature_extraction_' \
+ object_centric_model + '_' \
+ fusion_strategy + '_fusion_' \
+ pooling_mode + '_pool_weights_tf_dim_ordering_tf_kernels.h5'
augm_samples_weights_name = 'augm_compoundNet_feature_extraction_' \
+ object_centric_model + '_' \
+ fusion_strategy + '_fusion_' \
+ pooling_mode + '_pool_weights_tf_dim_ordering_tf_kernels.h5'
model_log = logs_dir + 'compoundNet_feature_extraction_' \
+ object_centric_model + '_' \
+ fusion_strategy + '_fusion_' \
+ pooling_mode + '_pool_log.csv'
csv_logger = CSVLogger(model_log, append=True, separator=',')
input_tensor = Input(shape=(224, 224, 3))
# create the base object_centric_model pre-trained model for warm-up
if object_centric_model == 'VGG16':
object_base_model = VGG16(input_tensor=input_tensor,
weights='imagenet',
include_top=False)
elif object_centric_model == 'VGG19':
object_base_model = VGG19(input_tensor=input_tensor,
weights='imagenet',
include_top=False)
elif object_centric_model == 'ResNet50':
tmp_model = ResNet50(input_tensor=input_tensor,
weights='imagenet',
include_top=False)
object_base_model = Model(
inputs=tmp_model.input,
outputs=tmp_model.get_layer('activation_48').output)
print('\n \n')
print('The plain, object-centric `' + object_centric_model +
'` pre-trained convnet was successfully initialised.\n')
scene_base_model = VGG16_Places365(input_tensor=input_tensor,
weights='places',
include_top=False)
print('The plain, scene-centric `' + scene_centric_model +
'` pre-trained convnet was successfully initialised.\n')
# retrieve the ouputs
object_base_model_output = object_base_model.output
scene_base_model_output = scene_base_model.output
# We will feed the extracted features to a merging layer
if fusion_strategy == 'concatenate':
merged = concatenate(
[object_base_model_output, scene_base_model_output])
elif fusion_strategy == 'average':
merged = average([object_base_model_output, scene_base_model_output])
else:
merged = maximum([object_base_model_output, scene_base_model_output])
if pooling_mode == 'avg':
x = GlobalAveragePooling2D(name='GAP')(merged)
elif pooling_mode == 'max':
x = GlobalMaxPooling2D(name='GMP')(merged)
elif pooling_mode == 'flatten':
x = Flatten(name='FLATTEN')(merged)
x = Dense(256, activation='relu',
name='FC1')(x) # let's add a fully-connected layer
# When random init is enabled, we want to include Dropout,
# otherwise when loading a pre-trained HRA model we want to omit
# Dropout layer so the visualisations are done properly (there is an issue if it is included)
x = Dropout(0.5, name='DROPOUT')(x)
# and a logistic layer with the number of classes defined by the `classes` argument
predictions = Dense(classes, activation='softmax',
name='PREDICTIONS')(x) # new softmax layer
# this is the transfer learning model we will train
model = Model(inputs=object_base_model.input, outputs=predictions)
print(
'Randomly initialised classifier was successfully added on top of the merged outputs. \n'
)
print(
'Number of trainable weights before freezing the conv. bases of the respective original models: '
'' + str(len(model.trainable_weights)))
# first: train only the top layers (which were randomly initialized)
# i.e. freeze all convolutional layers of the preliminary base model
for layer in object_base_model.layers:
layer.trainable = False
for layer in scene_base_model.layers:
layer.trainable = False
print(
'Number of trainable weights after freezing the conv. bases of the respective original models: '
'' + str(len(model.trainable_weights)))
print('\n')
# compile the warm_up_model (should be done *after* setting layers to non-trainable)
model.compile(optimizer=SGD(lr=0.0001, momentum=0.9),
loss='categorical_crossentropy',
metrics=['accuracy'])
model.summary()
# # The attribute model.metrics_names will give you the display labels for the scalar outputs.
# print warm_up_model.metrics_names
if data_augm_enabled:
print(
'Using augmented samples for training. This may take a while ! \n')
t = now()
history = model.fit_generator(augmented_train_generator,
steps_per_epoch=nb_train_samples //
batch_size,
epochs=feature_extraction_epochs,
callbacks=[csv_logger],
class_weight=class_weight)
print(
'Training time for re-training the last Dense layer using augmented samples: %s'
% (now() - t))
model.save_weights(feature_extraction_dir + augm_samples_weights_name)
print('Model weights using augmented samples were saved as `' +
augm_samples_weights_name + '`')
print('\n')
else:
t = now()
history = model.fit_generator(train_generator,
steps_per_epoch=nb_train_samples //
batch_size,
epochs=feature_extraction_epochs,
callbacks=[csv_logger],
class_weight=class_weight)
print('Training time for re-training the last Dense layer: %s' %
(now() - t))
model.save_weights(feature_extraction_dir + weights_name)
print('Model weights were saved as `' + weights_name + '`')
print('\n')
return model
def feature_extraction(pre_trained_model='VGG16',
pooling_mode='avg',
classes=9,
data_augm_enabled = False):
"""ConvNet as fixed feature extractor, consist of taking the convolutional base of a previously-trained network,
running the new data through it, and training a new classifier on top of the output.
(i.e. train only the randomly initialized top layers while freezing all convolutional layers of the original model).
# Arguments
pre_trained_model: one of `VGG16`, `VGG19`, `ResNet50`, `VGG16_Places365`
pooling_mode: Optional pooling_mode mode for feature extraction
- `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_mode
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_mode will
be applied.
classes: optional number of classes to classify images into,
only to be specified if `weights` argument is `None`.
data_augm_enabled: whether to augment the samples during training
# Returns
A Keras model instance.
# Raises
ValueError: in case of invalid argument for `pre_trained_model`, `pooling_mode` or invalid input shape.
"""
if not (pre_trained_model in {'VGG16', 'VGG19', 'ResNet50', 'VGG16_Places365'}):
raise ValueError('The `pre_trained_model` argument should be either '
'`VGG16`, `VGG19`, `ResNet50`, '
'or `VGG16_Places365`. Other models will be supported in future releases. ')
if not (pooling_mode in {'avg', 'max', 'flatten'}):
raise ValueError('The `pooling_mode` argument should be either '
'`avg` (GlobalAveragePooling2D), `max` '
'(GlobalMaxPooling2D), '
'or `flatten` (Flatten).')
# Define the name of the model and its weights
weights_name = 'feature_extraction_' + pre_trained_model + '_' + pooling_mode + '_pool_weights_tf_dim_ordering_tf_kernels.h5'
augm_samples_weights_name = 'augm_feature_extraction_' + pre_trained_model + '_' + pooling_mode + '_pool_weights_tf_dim_ordering_tf_kernels.h5'
model_log = logs_dir + 'feature_extraction_' + pre_trained_model + '_' + pooling_mode + '_pool_log.csv'
csv_logger = CSVLogger(model_log, append=True, separator=',')
input_tensor = Input(shape=(224, 224, 3))
# create the base pre-trained model for warm-up
if pre_trained_model == 'VGG16':
base_model = VGG16(weights='imagenet', include_top=False, input_tensor=input_tensor)
elif pre_trained_model == 'VGG19':
base_model = VGG19(weights='imagenet', include_top=False, input_tensor=input_tensor)
elif pre_trained_model == 'ResNet50':
base_model = ResNet50(weights='imagenet', include_top=False, input_tensor=input_tensor)
elif pre_trained_model == 'VGG16_Places365':
base_model = VGG16_Places365(weights='places', include_top=False, input_tensor=input_tensor)
print ('\n \n')
print('The plain `' + pre_trained_model + '` pre-trained convnet was successfully initialised.\n')
x = base_model.output
# Now we set-up transfer learning process - freeze all but the penultimate layer
# and re-train the last Dense layer with 9 final outputs representing probabilities for HRA classes.
# Build a randomly initialised classifier model to put on top of the convolutional model
# both `avg`and `max`result in the same size of the Dense layer afterwards
# Both Flatten and GlobalAveragePooling2D are valid options. So is GlobalMaxPooling2D.
# Flatten will result in a larger Dense layer afterwards, which is more expensive
# and may result in worse overfitting. But if you have lots of data, it might also perform better.
# https://github.com/keras-team/keras/issues/8470
if pooling_mode == 'avg':
x = GlobalAveragePooling2D(name='GAP')(x)
elif pooling_mode == 'max':
x = GlobalMaxPooling2D(name='GMP')(x)
elif pooling_mode == 'flatten':
x = Flatten(name='FLATTEN')(x)
x = Dense(256, activation='relu', name='FC1')(x) # let's add a fully-connected layer
# When random init is enabled, we want to include Dropout,
# otherwise when loading a pre-trained HRA model we want to omit
# Dropout layer so the visualisations are done properly (there is an issue if it is included)
x = Dropout(0.5, name='DROPOUT')(x)
# and a logistic layer with the number of classes defined by the `classes` argument
predictions = Dense(classes, activation='softmax', name='PREDICTIONS')(x) # new softmax layer
# this is the transfer learning model we will train
model = Model(inputs=base_model.input, outputs=predictions)
print('Randomly initialised classifier was successfully added on top of the original pre-trained conv. base. \n')
print('Number of trainable weights before freezing the conv. base of the original pre-trained convnet: '
'' + str(len(model.trainable_weights)))
# first: train only the top layers (which were randomly initialized)
# i.e. freeze all convolutional layers of the preliminary base model
for layer in base_model.layers:
layer.trainable = False
print('Number of trainable weights after freezing the conv. base of the pre-trained convnet: '
'' + str(len(model.trainable_weights)))
print ('\n')
# compile the warm_up_model (should be done *after* setting layers to non-trainable)
model.compile(optimizer=SGD(lr=0.0001, momentum=0.9),
loss='categorical_crossentropy',
metrics=['accuracy'])
model.summary()
# # The attribute model.metrics_names will give you the display labels for the scalar outputs.
# print warm_up_model.metrics_names
if data_augm_enabled:
print('Using augmented samples for training. This may take a while ! \n')
t = now()
history = model.fit_generator(augmented_train_generator,
steps_per_epoch=nb_train_samples // batch_size,
epochs=feature_extraction_epochs,
callbacks=[csv_logger])
print('Training time for re-training the last Dense layer using augmented samples: %s' % (now() - t))
model.save_weights(feature_extraction_dir + augm_samples_weights_name)
print(
'Model weights using augmented samples were saved as `' + augm_samples_weights_name + '`')
print ('\n')
else:
t = now()
history = model.fit_generator(train_generator,
steps_per_epoch=nb_train_samples // batch_size,
epochs=feature_extraction_epochs,
callbacks=[csv_logger])
print('Training time for re-training the last Dense layer: %s' % (now() - t))
model.save_weights(feature_extraction_dir + weights_name)
print('Model weights were saved as `' + weights_name + '`')
print ('\n')
return model
def HRA_VGG16_Places365(include_top=True,
weights='HRA',
input_tensor=None,
input_shape=None,
nb_of_conv_layers_to_fine_tune=None,
first_phase_trained_weights=None,
violation_class='cl',
verbose=0):
"""Instantiates the VGG16-Places365 architecture fine-tuned (2 steps) on Human Rights Archive dataset.
Optionally loads weights pre-trained on the 2 class version of Human Rights Archive Database.
# Arguments
include_top: whether to include the 3 fully-connected
layers at the top of the network.
weights: one of `None` (random initialization),
'HRA' (pre-training on Human Rights Archive),
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 input channels,
and width and height should be no smaller than 48.
E.g. `(200, 200, 3)` would be one valid value.
nb_of_conv_layers_to_fine_tune: integer to indicate the number of convolutional
layers to fine-tune. One of `1` (2,499,360 trainable params), `2` (4,859,168 trainable params) or `3` (7,218,976 trainable params).
first_phase_trained_weights: Weights of an already trained Keras model instance.
Only relevant when using `fine_tuning` as train_mode after `feature_extraction` weights have been saved.
violation_class: one of `cl` (HRA dataset with 2 classes - [i]'child_labour' and [ii]'no violation')
or `dp` (HRA dataset with 2 classes - [i]'displaced_populations' and [ii]'no violation')
verbose: Integer. 0, or 1. Verbosity mode. 0 = silent, 1 = model summary and weights info.
# Returns
A Keras model instance.
# Raises
ValueError: in case of invalid argument for `weights`, `violation_class`, `nb_of_conv_layers_to_fine_tune` or invalid input shape
"""
if not (weights in {'HRA', None} or os.path.exists(weights)):
raise ValueError('The `weights` argument should be either '
'`None` (random initialization), `HRA` '
'(pre-training on Human Rights Archive two-class), '
'or the path to the weights file to be loaded.')
if not (violation_class in {'cl', 'dp'}):
raise ValueError(
"The `violation_class` argument should be either "
"`cl` (HRA dataset with 2 classes - [i]'child_labour' and [ii]'no violation') "
"'or `dp` (HRA dataset with 2 classes - [i]'displaced_populations' and [ii]'no violation')"
)
if nb_of_conv_layers_to_fine_tune is None and include_top is False:
raise ValueError(
'Setting the `include_top` argument as false '
'is only relevant when the `nb_of_conv_layers_to_fine_tune` argument is not None (feature extraction), '
'otherwise the returned model would be exactly the default '
'keras-applications model.')
if weights == 'HRA' and first_phase_trained_weights is not None:
raise ValueError(
'Setting the `first_phase_trained_weights` argument as the path to the weights file '
'obtained from utilising feature_extraction '
'is only relevant when the `weights` argument is `None`. '
'If the `weights` argument is `HRA`, it means the model has already been trained on HRA dataset '
'and there is no need to provide a path to the weights file (saved from feature_extraction) to be loaded.'
)
if not (nb_of_conv_layers_to_fine_tune in {1, 2, 3, None}):
raise ValueError(
'The `nb_of_conv_layers_to_fine_tune` argument should be either '
'`None` (indicates feature extraction mode), '
'`1`, `2` or `3`. '
'More than 3 conv. layers are not supported because the more parameters we are training , '
'the more we are at risk of overfitting.')
cache_subdir = 'AbuseNet'
mode = _obtain_train_mode(
nb_of_conv_layers_to_fine_tune=nb_of_conv_layers_to_fine_tune)
# Determine proper input shape
input_shape = _obtain_input_shape(input_shape,
default_size=224,
min_size=48,
data_format=K.image_data_format(),
require_flatten=include_top,
weights=weights)
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not K.is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
# Ensure that the model takes into account any potential predecessors of `input_tensor`.
if input_tensor is not None:
inputs = get_source_inputs(input_tensor)
else:
inputs = img_input
# create the base pre-trained model
base_model = VGG16_Places365(weights='places',
include_top=False,
input_tensor=img_input)
x = base_model.output
# Classification block - build a classifier model to put on top of the convolutional model
if include_top:
# add a global spatial pooling layer (which seems to have the best performance)
x = GlobalAveragePooling2D(name='GAP')(x)
# add a fully-connected layer
x = Dense(256, activation='relu', name='FC1')(x)
# When random init is enabled, we want to include Dropout,
# otherwise when loading a pre-trained HRA model we want to omit that layer,
# so the visualisations are done properly (there is an issue if it is included)
if weights is None:
x = Dropout(0.5, name='DROPOUT')(x)
# and a logistic layer with the number of classes defined by the `classes` argument
x = Dense(2, activation='softmax', name='PREDICTIONS')(x)
model = Model(inputs=inputs,
outputs=x,
name='HRA-2CLASS-VGG16_Places365')
else:
model = Model(inputs=inputs,
outputs=x,
name='HRA-2CLASS-VGG16_Places365-NO-TOP')
model.compile(optimizer=SGD(lr=0.0001, momentum=0.9),
loss='categorical_crossentropy',
metrics=['accuracy'])
return model
if mode == 'feature_extraction':
print('[INFO] Feature extraction mode. \n')
if verbose == 1:
print(
'[INFO] Number of trainable weights before freezing the conv. base of the original pre-trained convnet: '
'' + str(len(model.trainable_weights)))
for layer in base_model.layers:
layer.trainable = False
if verbose == 1:
print(
'[INFO] Number of trainable weights after freezing the conv. base of the original pre-trained convnet: '
'' + str(len(model.trainable_weights)))
model.compile(optimizer=SGD(lr=0.0001, momentum=0.9),
loss='categorical_crossentropy',
metrics=['accuracy'])
elif mode == 'fine_tuning':
if nb_of_conv_layers_to_fine_tune == 1:
# Uncomment for extra verbosity
# print('[INFO] Fine-tuning of the last one (1) conv. layer. \n')
if verbose == 1:
print(
'[INFO] Number of trainable weights before unfreezing the last conv. layer of the model with the retrained classifier: '
'' + str(len(model.trainable_weights)))
for layer in model.layers[:17]:
layer.trainable = False
for layer in model.layers[17:]:
layer.trainable = True
if verbose == 1:
print(
'[INFO] Number of trainable weights after unfreezing the last conv. layer of the model with the retrained classifier: '
'' + str(len(model.trainable_weights)))
elif nb_of_conv_layers_to_fine_tune == 2:
# Uncomment for extra verbosity
# print('[INFO] Fine-tuning of the last two (2) conv. layers. \n')
if verbose == 1:
print(
'[INFO] Number of trainable weights before unfreezing the last two (2) conv. layers of the model with the retrained classifier: '
'' + str(len(model.trainable_weights)))
for layer in model.layers[:16]:
layer.trainable = False
for layer in model.layers[16:]:
layer.trainable = True
if verbose == 1:
print(
'[INFO] Number of trainable weights after unfreezing the last two (2) conv. layers of the model with the retrained classifier: '
'' + str(len(model.trainable_weights)))
elif nb_of_conv_layers_to_fine_tune == 3:
# Uncomment for extra verbosity
# print('[INFO] Fine-tuning of the last three (3) conv. layers. \n')
if verbose == 1:
print(
'[INFO] Number of trainable weights before unfreezing the last three (3) conv. layers of the model with the retrained classifier: '
'' + str(len(model.trainable_weights)))
for layer in model.layers[:15]:
layer.trainable = False
for layer in model.layers[15:]:
layer.trainable = True
if verbose == 1:
print(
'[INFO] Number of trainable weights after unfreezing the last three (3) conv. layers of the model with the retrained classifier: '
'' + str(len(model.trainable_weights)))
model.compile(optimizer=SGD(lr=0.0001, momentum=0.9),
loss='categorical_crossentropy',
metrics=['accuracy'])
if verbose == 1:
model.summary()
# load weights
if weights == 'HRA':
# Child labour
if violation_class == 'cl':
if include_top:
if mode == 'feature_extraction':
weights_path = get_file(CL_FEATURE_EXTRACTION_FNAME,
CL_WEIGHTS_FEATURE_EXTRACTION_PATH,
cache_subdir=cache_subdir)
elif mode == 'fine_tuning':
if nb_of_conv_layers_to_fine_tune == 1:
weights_path = get_file(CL_PATH_ONE_CONV_LAYER_FNAME,
CL_WEIGHTS_PATH_ONE_CONV_LAYER,
cache_subdir=cache_subdir)
elif nb_of_conv_layers_to_fine_tune == 2:
weights_path = get_file(
CL_PATH_TWO_CONV_LAYERS_FNAME,
CL_WEIGHTS_PATH_TWO_CONV_LAYERS,
cache_subdir=cache_subdir)
elif nb_of_conv_layers_to_fine_tune == 3:
weights_path = get_file(
CL_PATH_THREE_CONV_LAYERS_FNAME,
CL_WEIGHTS_PATH_THREE_CONV_LAYERS,
cache_subdir=cache_subdir)
# no top
else:
if nb_of_conv_layers_to_fine_tune == 1:
weights_path = get_file(
CL_PATH_ONE_CONV_LAYER_NO_TOP_FNAME,
CL_WEIGHTS_PATH_ONE_CONV_LAYER_NO_TOP,
cache_subdir=cache_subdir)
elif nb_of_conv_layers_to_fine_tune == 2:
weights_path = get_file(
CL_PATH_TWO_CONV_LAYERS_NO_TOP_FNAME,
CL_WEIGHTS_PATH_TWO_CONV_LAYERS_NO_TOP,
cache_subdir=cache_subdir)
elif nb_of_conv_layers_to_fine_tune == 3:
weights_path = get_file(
CL_PATH_THREE_CONV_LAYERS_NO_TOP_FNAME,
CL_WEIGHTS_PATH_THREE_CONV_LAYERS_NO_TOP,
cache_subdir=cache_subdir)
# Displaced populations
elif violation_class == 'dp':
if include_top:
if mode == 'feature_extraction':
weights_path = get_file(DP_FEATURE_EXTRACTION_FNAME,
DP_WEIGHTS_FEATURE_EXTRACTION_PATH,
cache_subdir=cache_subdir)
elif mode == 'fine_tuning':
if nb_of_conv_layers_to_fine_tune == 1:
weights_path = get_file(DP_PATH_ONE_CONV_LAYER_FNAME,
DP_WEIGHTS_PATH_ONE_CONV_LAYER,
cache_subdir=cache_subdir)
elif nb_of_conv_layers_to_fine_tune == 2:
weights_path = get_file(
DP_PATH_TWO_CONV_LAYERS_FNAME,
DP_WEIGHTS_PATH_TWO_CONV_LAYERS,
cache_subdir=cache_subdir)
elif nb_of_conv_layers_to_fine_tune == 3:
weights_path = get_file(
DP_PATH_THREE_CONV_LAYERS_FNAME,
DP_WEIGHTS_PATH_THREE_CONV_LAYERS,
cache_subdir=cache_subdir)
# no top
else:
if nb_of_conv_layers_to_fine_tune == 1:
weights_path = get_file(
DP_PATH_ONE_CONV_LAYER_NO_TOP_FNAME,
DP_WEIGHTS_PATH_ONE_CONV_LAYER_NO_TOP,
cache_subdir=cache_subdir)
elif nb_of_conv_layers_to_fine_tune == 2:
weights_path = get_file(
DP_PATH_TWO_CONV_LAYERS_NO_TOP_FNAME,
DP_WEIGHTS_PATH_TWO_CONV_LAYERS_NO_TOP,
cache_subdir=cache_subdir)
elif nb_of_conv_layers_to_fine_tune == 3:
weights_path = get_file(
DP_PATH_THREE_CONV_LAYERS_NO_TOP_FNAME,
DP_WEIGHTS_PATH_THREE_CONV_LAYERS_NO_TOP,
cache_subdir=cache_subdir)
model.load_weights(weights_path)
elif weights is not None:
model.load_weights(weights)
return model
def __init__(self, pre_trained_model):
"""
Base class for feature extraction.
:param pre_trained_model: one of `VGG16`, `VGG19`, `ResNet50`, `VGG16_Places365`
"""
# Base directory of raw jpg/png images
base_dir = '/home/gkallia/git/Human-Rights-Archive-CNNs/datasets/Human_Rights_Archive_DB'
train_dir = os.path.join(base_dir, 'train_val')
test_dir = os.path.join(base_dir, 'test')
self.nb_train_samples = 3050
self.nb_test_samples = 270
# human_rights_classes = ['arms', 'child_labour', 'child_marriage', 'detention_centres',
# 'disability_rights', 'displaced_populations', 'environment',
# 'no_violation', 'out_of_school']
# Augmentation configuration with only rescaling.
# Rescale is a value by which we will multiply the data before any other processing.
# Our original images consist in RGB coefficients in the 0-255, but such values would
# be too high for our models to process (given a typical learning rate),
# so we target values between 0 and 1 instead by scaling with a 1/255. factor.
datagen = ImageDataGenerator(rescale=1. / 255)
img_width, img_height = 224, 224
self.train_batch_size = 25
self.test_batch_size = 15
self.train_generator = datagen.flow_from_directory(
train_dir,
target_size=(img_width, img_height),
class_mode='categorical',
batch_size=self.train_batch_size)
self.test_generator = datagen.flow_from_directory(
test_dir,
target_size=(img_width, img_height),
class_mode='categorical',
batch_size=self.test_batch_size)
if not (pre_trained_model
in {'VGG16', 'VGG19', 'ResNet50', 'VGG16_Places365'}):
raise ValueError(
'The `pre_trained_model` argument should be either '
'`VGG16`, `VGG19`, `ResNet50`, '
'or `VGG16_Places365`. Other models will be supported in future releases. '
)
input_tensor = Input(shape=(224, 224, 3))
# create the base pre-trained model for warm-up
if pre_trained_model == 'VGG16':
self.conv_base = VGG16(weights='imagenet',
include_top=False,
input_tensor=input_tensor)
elif pre_trained_model == 'VGG19':
self.conv_base = VGG19(weights='imagenet',
include_top=False,
input_tensor=input_tensor)
elif pre_trained_model == 'ResNet50':
self.conv_base = ResNet50(weights='imagenet',
include_top=False,
input_tensor=input_tensor)
elif pre_trained_model == 'VGG16_Places365':
self.conv_base = VGG16_Places365(weights='places',
include_top=False,
input_tensor=input_tensor)
self.bottleneck_train_features_filename = 'bottleneck_train_features_' + pre_trained_model + '.npy'
self.bottleneck_train_labels_filename = 'bottleneck_train_labels_' + pre_trained_model + '.npy'
self.bottleneck_test_features_filename = 'bottleneck_test_features_' + pre_trained_model + '.npy'
self.bottleneck_test_labels_filename = 'bottleneck_test_labels_' + pre_trained_model + '.npy'
self.cache_subdir = 'HRA_models'
self.pre_trained_model = pre_trained_model
def EMOTIC_VAD_ResNet50(include_top=True, weights='emotic'):
"""Instantiates the EMOTIC_VAD_ResNet50 architecture.
Optionally loads weights pre-trained
on EMOTIC. Note that when using TensorFlow,
for best performance you should set
`image_data_format="channels_last"` in your Keras config
at ~/.keras/keras.json.
The model and the weights are compatible with both
TensorFlow and Theano. The data format
convention used by the model is the one
specified in your Keras config file.
# Arguments
include_top: whether to include the 3 fully-connected
layers at the top of the network.
weights: one of `None` (random initialization),
'emotic' (pre-training on EMOTIC),
or the path to the weights file to be loaded.
classes: optional number of discrete emotion classes to classify images into.
# Returns
A Keras model instance.
# Raises
ValueError: in case of invalid argument for `weights`
"""
if not (weights in {'emotic', None} or os.path.exists(weights)):
raise ValueError('The `weights` argument should be either '
'`None` (random initialization), `emotic` '
'(pre-training on EMOTIC dataset), '
'or the path to the weights file to be loaded.')
body_inputs = Input(shape=(224, 224, 3), name='INPUT')
image_inputs = Input(shape=(224, 224, 3), name='INPUT')
# Body module
tmp_model = ResNet50(include_top=False,
weights='imagenet',
input_tensor=body_inputs,
pooling='avg')
body_truncated_model = Model(inputs=tmp_model.input,
outputs=tmp_model.get_layer(index=169).output)
# body_truncated_model = Model(inputs=tmp_model.input, outputs=tmp_model.get_layer('activation_48').output)
for layer in body_truncated_model.layers:
layer.name = str("body-") + layer.name
# Image module
image_truncated_model = VGG16_Places365(include_top=False,
weights='places',
input_tensor=image_inputs,
pooling='avg')
for layer in image_truncated_model.layers:
layer.name = str("image-") + layer.name
# retrieve the ouputs
body_plain_model_output = body_truncated_model.output
image_plain_model_output = image_truncated_model.output
# In case ResNet50 is selected we need to use a global average pooling layer to follow the process used for the othe CNNs.
body_plain_model_output = GlobalAveragePooling2D(
name='GAP')(body_plain_model_output)
merged = concatenate([body_plain_model_output, image_plain_model_output])
x = Dense(256,
activation='relu',
name='FC1',
kernel_regularizer=regularizers.l2(0.01),
kernel_initializer='random_normal')(merged)
x = Dropout(0.5, name='DROPOUT')(x)
vad_cont_prediction = Dense(units=3,
kernel_initializer='random_normal',
name='VAD')(x)
# At model instantiation, you specify the two inputs and the output.
model = Model(inputs=[body_inputs, image_inputs],
outputs=vad_cont_prediction,
name='EMOTIC-VAD-regression-ResNet50')
for layer in body_truncated_model.layers:
layer.trainable = False
for layer in image_truncated_model.layers:
layer.trainable = False
model.compile(optimizer=SGD(lr=1e-5, momentum=0.9),
loss=euclidean_distance_loss,
metrics=['mae', 'mse', rmse])
# load weights
if weights == 'emotic':
if include_top:
weights_path = get_file(
'emotic_vad_ResNet50_weights_tf_dim_ordering_tf_kernels.h5',
WEIGHTS_PATH,
cache_subdir='AbuseNet')
else:
weights_path = get_file(
'emotic_vad_ResNet50_weights_tf_dim_ordering_tf_kernels_notop.h5',
WEIGHTS_PATH_NO_TOP,
cache_subdir='AbuseNet')
model.load_weights(weights_path)
elif weights is not None:
model.load_weights(weights)
return model
def HRA_VGG16_Places365(include_top=True,
weights='HRA',
input_tensor=None,
input_shape=None,
mode='fine_tuning',
pooling_mode='avg',
classes=9,
data_augm_enabled=False):
"""Instantiates the VGG16_Places365 architecture fine-tuned (2 steps) on Human Rights Archive dataset.
Optionally loads weights pre-trained on Human Rights Archive Database.
# Arguments
include_top: whether to include the 3 fully-connected
layers at the top of the network.
weights: one of `None` (random initialization),
'HRA' (pre-training on Human Rights Archive),
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 input channels,
and width and height should be no smaller than 48.
E.g. `(200, 200, 3)` would be one valid value.
mode: one of `TL` (transfer learning - freeze all but the penultimate layer and re-train the last Dense layer)
or `FT` (fine-tuning - unfreeze the lower convolutional layers and retrain more layers) ,
pooling_mode: Pooling mode that will be applied to the output of the last convolutional layer of the original model
and thus the output of the model will be a 2D tensor.
- `avg` means that global average pooling_mode operation for spatial data will be applied.
- `max` means that global max pooling_mode operation for spatial data will be applied.
- `flatten` means that the output of the the last convolutional
layer of the original model will be flatten,
resulting in a larger Dense layer afterwards.
classes: optional number of classes to classify images into.
data_augm_enabled: whether to use the augmented samples during training.
# Returns
A Keras model instance.
# Raises
ValueError: in case of invalid argument for `weights`, or invalid input shape
"""
if not (weights in {'HRA', None} or os.path.exists(weights)):
raise ValueError('The `weights` argument should be either '
'`None` (random initialization), `HRA` '
'(pre-training on Human Rights Archive), '
'or the path to the weights file to be loaded.')
if not (mode in {'feature_extraction', 'fine_tuning'}):
raise ValueError(
'The `mode` argument should be either '
'`feature_extraction` (freeze all but the penultimate layer and re-train the last Dense layer),'
'or `fine_tuning` (unfreeze the lower convolutional layers and retrain more layers). '
)
if not (pooling_mode in {'avg', 'max', 'flatten'}):
raise ValueError(
'The `pooling_mode` argument should be either '
'`avg` (global average pooling_mode), `max` (global max pooling_mode)'
'or `flatten` (the output will be flatten). ')
if mode == 'feature_extraction' and include_top is False:
raise ValueError(
'The `include_top` argument can be set as false only '
'when the `mode` argument is `fine_tuning`. '
'If not, the returned model would have been literally the default '
'keras-applications model and not the one trained on HRA.')
cache_subdir = 'hra_models_fewer_params'
# Determine proper input shape
input_shape = _obtain_input_shape(input_shape,
default_size=224,
min_size=48,
data_format=K.image_data_format(),
require_flatten=include_top,
weights=weights)
if input_tensor is None:
img_input = Input(shape=input_shape)
else:
if not K.is_keras_tensor(input_tensor):
img_input = Input(tensor=input_tensor, shape=input_shape)
else:
img_input = input_tensor
# Ensure that the model takes into account any potential predecessors of `input_tensor`.
if input_tensor is not None:
inputs = get_source_inputs(input_tensor)
else:
inputs = img_input
# create the base pre-trained model
base_model = VGG16_Places365(weights='places',
include_top=False,
input_tensor=img_input)
x = base_model.output
# Classification block - build a classifier model to put on top of the convolutional model
if include_top:
# add a global spatial pooling_mode layer or flatten the obtained output from the original model
if pooling_mode == 'avg':
x = GlobalAveragePooling2D(name='GAP')(x)
elif pooling_mode == 'max':
x = GlobalMaxPooling2D(name='GMP')(x)
elif pooling_mode == 'flatten':
x = Flatten(name='FLATTEN')(x)
# add a fully-connected layer
x = Dense(256, activation='relu', name='FC1')(x)
# When random init is enabled, we want to include Dropout,
# otherwise when loading a pre-trained HRA model we want to omit that layer,
# so the visualisations are done properly (there is an issue if it is included)
if weights is None:
x = Dropout(0.5, name='DROPOUT')(x)
# and a logistic layer with the number of classes defined by the `classes` argument
x = Dense(classes, activation='softmax', name='PREDICTIONS')(x)
model = Model(inputs=inputs, outputs=x, name='HRA-VGG16_Places365')
# load weights
if weights == 'HRA':
if include_top:
if mode == 'feature_extraction':
for layer in base_model.layers:
layer.trainable = False
model.compile(optimizer=SGD(lr=0.0001, momentum=0.9),
loss='categorical_crossentropy')
if data_augm_enabled:
if pooling_mode == 'avg':
weights_path = get_file(
AUGM_FEATURE_EXTRACTION_AVG_POOL_fname,
AUGM_FEATURE_EXTRACTION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
AUGM_FEATURE_EXTRACTION_FLATTEN_POOL_fname,
AUGM_FEATURE_EXTRACTION_FLATTEN_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
AUGM_FEATURE_EXTRACTION_MAX_POOL_fname,
AUGM_FEATURE_EXTRACTION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
else:
if pooling_mode == 'avg':
weights_path = get_file(
FEATURE_EXTRACTION_AVG_POOL_fname,
FEATURE_EXTRACTION_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
FEATURE_EXTRACTION_FLATTEN_POOL_fname,
FEATURE_EXTRACTION_FLATTEN_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
FEATURE_EXTRACTION_MAX_POOL_fname,
FEATURE_EXTRACTION_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif mode == 'fine_tuning':
if pooling_mode == 'flatten':
for layer in model.layers[:17]:
layer.trainable = False
for layer in model.layers[17:]:
layer.trainable = True
else:
for layer in model.layers[:16]:
layer.trainable = False
for layer in model.layers[16:]:
layer.trainable = True
model.compile(optimizer=SGD(lr=0.0001, momentum=0.9),
loss='categorical_crossentropy',
metrics=['accuracy'])
if data_augm_enabled:
if pooling_mode == 'avg':
weights_path = get_file(
AUGM_FINE_TUNING_AVG_POOL_fname,
AUGM_FINE_TUNING_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
AUGM_FINE_TUNING_FLATTEN_POOL_fname,
AUGM_FINE_TUNING_FLATTEN_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
AUGM_FINE_TUNING_MAX_POOL_fname,
AUGM_FINE_TUNING_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
else:
if pooling_mode == 'avg':
weights_path = get_file(
FINE_TUNING_AVG_POOL_fname,
FINE_TUNING_AVG_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'flatten':
weights_path = get_file(
FINE_TUNING_FLATTEN_POOL_fname,
FINE_TUNING_FLATTEN_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
elif pooling_mode == 'max':
weights_path = get_file(
FINE_TUNING_MAX_POOL_fname,
FINE_TUNING_MAX_POOL_WEIGHTS_PATH,
cache_subdir=cache_subdir)
else:
weights_path = get_file(FINE_TUNING_WEIGHTS_PATH_NO_TOP_fname,
FINE_TUNING_WEIGHTS_PATH_NO_TOP,
cache_subdir=cache_subdir)
model.load_weights(weights_path)
elif weights is not None:
model.load_weights(weights)
return model
