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visual_model_selector.py
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visual_model_selector.py
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from __future__ import absolute_import, division
import importlib
from tensorflow.keras.layers import Input
from tensorflow.keras.layers import Dense
from tensorflow.keras.models import Model
from dense_classifier import get_classifier
from downscaling_cnn import get_downscaling_model
class ModelFactory:
"""
Model facotry for Keras default models
"""
def __init__(self):
self.models_ = dict(
VGG16=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.vgg16",
last_conv_layer="block5_conv3",
),
VGG19=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.vgg19",
last_conv_layer="block5_conv4",
),
DenseNet121=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.densenet",
last_conv_layer="bn",
),
DenseNet169=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.densenet",
last_conv_layer="bn",
),
DenseNet201=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.densenet",
last_conv_layer="bn",
),
Xception=dict(
input_shape=(299, 299, 3),
module_name="tensorflow.keras.applications.xception",
last_conv_layer="block14_sepconv2_bn",
),
ResNet50=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.resnet",
last_conv_layer="activation_49",
),
ResNet50V2=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.resnet_v2",
last_conv_layer="activation_49",
),
ResNet101=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.resnet",
last_conv_layer="activation_49",
),
ResNet101V2=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.resnet_v2",
last_conv_layer="activation_49",
),
ResNet152=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.resnet",
last_conv_layer="activation_49",
),
ResNet152V2=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.resnet_v2",
last_conv_layer="activation_49",
),
InceptionV3=dict(
input_shape=(299, 299, 3),
module_name="tensorflow.keras.applications.inception_v3",
last_conv_layer="mixed10",
),
InceptionResNetV2=dict(
input_shape=(299, 299, 3),
module_name="tensorflow.keras.applications.inception_resnet_v2",
last_conv_layer="conv_7b_ac",
),
NASNetMobile=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.nasnet",
last_conv_layer="activation_188",
),
NASNetLarge=dict(
input_shape=(331, 331, 3),
module_name="tensorflow.keras.applications.nasnet",
last_conv_layer="activation_260",
),
MobileNet=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.mobilenet",
last_conv_layer="conv_pw_13_bn",
),
MobileNetV2=dict(
input_shape=(224, 224, 3),
module_name="tensorflow.keras.applications.mobilenet_v2",
last_conv_layer="Conv_1_bn",
),
EfficientNetB0=dict(
input_shape=(224, 224, 3),
module_name="efficientnet.tfkeras",
last_conv_layer="Conv_1_bn",
),
EfficientNetB1=dict(
input_shape=(224, 224, 3),
module_name="efficientnet.tfkeras",
last_conv_layer="Conv_1_bn",
),
EfficientNetB2=dict(
input_shape=(224, 224, 3),
module_name="efficientnet.tfkeras",
last_conv_layer="Conv_1_bn",
),
EfficientNetB3=dict(
input_shape=(224, 224, 3),
module_name="efficientnet.tfkeras",
last_conv_layer="Conv_1_bn",
),
EfficientNetB4=dict(
input_shape=(224, 224, 3),
module_name="efficientnet.tfkeras",
last_conv_layer="Conv_1_bn",
),
EfficientNetB5=dict(
input_shape=(224, 224, 3),
module_name="efficientnet.tfkeras",
last_conv_layer="Conv_1_bn",
),
EfficientNetB6=dict(
input_shape=(224, 224, 3),
module_name="efficientnet.tfkeras",
last_conv_layer="Conv_1_bn",
),
EfficientNetB7=dict(
input_shape=(224, 224, 3),
module_name="efficientnet.tfkeras",
last_conv_layer="Conv_1_bn",
),
)
def get_last_conv_layer(self, model_name):
return self.models_[model_name]["last_conv_layer"]
def get_input_size(self, model_name):
return self.models_[model_name]["input_shape"][:2]
def load_chexnet_weights(self, base_model, img_input, weights_path):
predictions = Dense(14, activation="sigmoid", name="predictions")(base_model.output)
base_model = Model(inputs=img_input, outputs=predictions)
base_model.load_weights(weights_path)
print(f"loaded chexnet weights: {weights_path}")
return base_model
def pop_conv_layers(self, base_model, img_input, layers_to_pop):
for i in range(layers_to_pop):
base_model._layers.pop()
base_model.outputs = [base_model.layers[-1].output]
base_model = Model(inputs=img_input, outputs=base_model.outputs, name='Visual_Model')
return base_model
def set_trainable_layers(self, base_model, layers_to_train):
for i in range(len(base_model.layers) - layers_to_train):
base_model.layers[i].trainable = False
return base_model
def get_output_unrolled_size(self, output_layer_shape):
output_unrolled_length = 1
for dimension in output_layer_shape[1:]:
output_unrolled_length *= int(dimension)
return output_unrolled_length
def concat_models(self, downscaling_model, visual_model, classifier, img_input, base_model_img_input):
base_model_output = visual_model.layers[-1].output
if downscaling_model is not None:
downscaled_images = downscaling_model(img_input)
visual_features = visual_model(downscaled_images)
if classifier is not None:
predictions = classifier(visual_features)
loaded_model = Model(inputs=img_input, outputs=predictions, name='Pipeline')
else:
loaded_model = Model(inputs=img_input, outputs=visual_features, name='Pipeline')
else:
if classifier is not None:
predictions = classifier(base_model_output)
loaded_model = Model(inputs=base_model_img_input, outputs=predictions, name='Pipeline')
else:
loaded_model = visual_model
return loaded_model
def get_model(self, FLAGS):
if FLAGS.use_imagenet_weights is True:
base_weights = "imagenet"
else:
base_weights = None
base_model_class = getattr(
importlib.import_module(
"{}".format(self.models_[FLAGS.visual_model_name]['module_name'])
),
FLAGS.visual_model_name)
input_shape = FLAGS.image_target_size
if input_shape is None:
input_shape = self.models_[FLAGS.visual_model_name]["input_shape"]
img_input = Input(shape=input_shape, name="image_batch")
downscaling_model = None
if FLAGS.cnn_downscaling_factor > 0:
downscaling_model = get_downscaling_model(input_shape, FLAGS.cnn_downscaling_factor,
FLAGS.cnn_downscaling_filters)
input_shape = (int(input_shape[0] / (FLAGS.cnn_downscaling_factor * 2)),
int(input_shape[1] / (FLAGS.cnn_downscaling_factor * 2)), 3)
base_model_img_input = Input(shape=input_shape)
base_model = base_model_class(
include_top=False,
input_tensor=base_model_img_input,
input_shape=input_shape,
weights=base_weights,
pooling=FLAGS.final_layer_pooling)
chexnet_classifier_exists = False
if FLAGS.use_chexnet_weights and FLAGS.visual_model_name == 'DenseNet121':
base_model = self.load_chexnet_weights(base_model, base_model_img_input, FLAGS.chexnet_weights_path)
chexnet_classifier_exists = True
if FLAGS.pop_conv_layers > 0:
base_model = self.pop_conv_layers(base_model, base_model_img_input, FLAGS.pop_conv_layers)
chexnet_classifier_exists = False
if FLAGS.conv_layers_to_train != -1:
base_model = self.set_trainable_layers(base_model, FLAGS.conv_layers_to_train)
classifier = None
if FLAGS.classes is not None and FLAGS.classes != [] and not chexnet_classifier_exists:
base_model_output = base_model.layers[-1].output
output_unrolled_length = self.get_output_unrolled_size(base_model_output.shape)
classifier = get_classifier(output_unrolled_length, FLAGS.multi_label_classification,
FLAGS.classifier_layer_sizes, len(FLAGS.classes))
loaded_model = self.concat_models(downscaling_model, base_model, classifier, img_input, base_model_img_input)
if FLAGS.show_model_summary:
loaded_model.summary()
if downscaling_model is not None:
downscaling_model.summary()
base_model.summary()
if classifier is not None:
classifier.summary()
return loaded_model