class MedModel(tf.keras.Model):
def __init__(self):
super(MedModel, self).__init__()
# Optimizer
self.optimizer = tf.keras.optimizers.SGD(
learning_rate=hp.learning_rate, momentum=hp.momentum)
# Load instance of small model .h5 (get_appropriate layer and those weight)
small_model = SmallModel()
small_model(tf.keras.Input(shape=(8, 8, 3)))
print(os.getcwd())
small_model.load_weights("./models/small_weights.h5")
self.small_model = small_model
initializer = tf.keras.initializers.Ones()
# Define Model Layers
# First Conv Block
self.med_conv1 = Conv2D(filters=64,
kernel_size=3,
strides=1,
padding='SAME',
activation=None,
name="med_conv1")
self.upsamp_small_filters_conv1 = Conv2D(
filters=64,
kernel_size=3,
kernel_initializer=self.small_conv1_init,
padding='SAME',
name='upsamp_small_filters_conv1',
trainable=False)
self.comb_tensors1 = Concatenate(axis=3, name="med_concat1")
self.med_bn1 = BatchNormalization(name="med_bn1")
self.med_relu1 = ReLU(name="med_relu1")
# Second Conv Block
self.med_conv2 = Conv2D(filters=64,
kernel_size=3,
strides=1,
padding='SAME',
activation=None,
name="med_conv2")
self.down_med_relu1 = Conv2D(filters=64,
kernel_size=1,
padding='SAME',
activation=None,
kernel_initializer=initializer,
name="reduce_filters",
trainable=False)
self.upsamp_small_filters_conv2 = Conv2D(
filters=64,
kernel_size=3,
kernel_initializer=self.small_conv2_init,
padding='SAME',
name='upsamp_small_filters_conv2',
trainable=False)
self.comb_tensors2 = Concatenate(axis=3, name="med_concat2")
self.med_bn2 = BatchNormalization(name="med_bn2")
self.med_relu2 = ReLU(name="med_relu2")
# Third Conv Block
self.med_conv3 = Conv2D(filters=64,
kernel_size=3,
strides=1,
padding='SAME',
activation=None,
name="med_conv3")
self.med_bn3 = BatchNormalization(name="med_bn3")
self.med_relu3 = ReLU(name="med_relu3")
# Fourth Conv Block
self.med_conv4 = Conv2D(filters=64,
kernel_size=3,
strides=1,
padding='SAME',
activation=None,
name="med_conv4")
self.med_bn4 = BatchNormalization(name="med_bn4")
self.med_relu4 = ReLU(name="med_relu4")
# Classification Part
self.med_class_conv1 = Conv2D(filters=128,
kernel_size=3,
strides=2,
padding='same',
name="med_class_conv1")
self.med_class_conv2 = Conv2D(filters=128,
kernel_size=3,
strides=2,
padding='same',
name="med_class_conv2")
self.med_class_flatten = Flatten(name="med_class_flatten")
self.med_class_dense = Dense(units=10, activation='softmax')
# This function returns small_conv1_filters
def small_conv1_init(self, shape, dtype=None):
small_conv1_filters, biases = self.small_model.get_layer(
"small_conv1").get_weights()
return small_conv1_filters
# This function returns small_conv2_filters
def small_conv2_init(self, shape, dtype=None):
small_conv2_filters, biases = self.small_model.get_layer(
"small_conv2").get_weights()
return small_conv2_filters
def call(self, inputs, training=False):
"""
The call function is inherited from Model. It defines the behaviour of the model.
In this function we will connect the layers we defined in __init__ together.
Please review Connection Scheme and observe naming conventions.
:param inputs: these are the images that are passed in shape (batches, height, width, channels)
:param training: BOOL this is a MODEL param that indicates if we are training or testing... I'm still trying to figure this out...
:return: stuff (softmax class probabilities in this case)
"""
# Connect First Med Conv Block
med_conv1 = self.med_conv1.apply(inputs)
upsamp_small_filters_conv1 = self.upsamp_small_filters_conv1.apply(
inputs)
comb_tensors1 = self.comb_tensors1.apply(
[med_conv1, upsamp_small_filters_conv1])
med_bn1 = self.med_bn1.apply(comb_tensors1)
med_relu1 = self.med_relu1.apply(med_bn1)
# Connect Second Med Conv Block
med_conv2 = self.med_conv2.apply(med_relu1)
down_samp_relu1 = self.down_med_relu1.apply(med_relu1)
upsamp_small_filters_conv2 = self.upsamp_small_filters_conv2.apply(
down_samp_relu1)
comb_tensors2 = self.comb_tensors2.apply(
[med_conv2, upsamp_small_filters_conv2])
med_bn2 = self.med_bn2.apply(comb_tensors2)
med_relu2 = self.med_relu2.apply(med_bn2)
# Connect Third Med Conv Block
med_conv3 = self.med_conv3.apply(med_relu2)
med_bn3 = self.med_bn3.apply(med_conv3)
med_relu3 = self.med_relu3.apply(med_bn3)
# Connect Fourth Med Conv Block
med_conv4 = self.med_conv4.apply(med_relu3)
med_bn4 = self.med_bn4.apply(med_conv4)
med_relu4 = self.med_relu4.apply(med_bn4)
# Connect Small Class Block
med_class_conv1 = self.med_class_conv1.apply(med_relu4)
med_class_conv2 = self.med_class_conv2.apply(med_class_conv1)
med_class_flatten = self.med_class_flatten.apply(med_class_conv2)
med_class_dense = self.med_class_dense.apply(med_class_flatten)
# if training:
# output = med_class_dense
# else:
# #pred = np.argmax(med_class_dense)
# #conf = np.max(med_class_dense)
# #output = [pred, conf]
return med_class_dense
@staticmethod
def loss_fn(labels, predictions):
""" Loss function for model. """
return tf.keras.losses.sparse_categorical_crossentropy(
labels, predictions, from_logits=False)
