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uwave_model.py
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uwave_model.py
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from keras.models import Model
from keras.layers import Input, Dense, LSTM, multiply, concatenate, Activation, Masking, Reshape
from keras.layers import Conv1D, BatchNormalization, GlobalAveragePooling1D, Permute, Dropout
from utils.constants import MAX_NB_VARIABLES, NB_CLASSES_LIST, MAX_TIMESTEPS_LIST
from utils.keras_utils import train_model, evaluate_model, set_trainable
from utils.layer_utils import AttentionLSTM
DATASET_INDEX = 24
MAX_TIMESTEPS = MAX_TIMESTEPS_LIST[DATASET_INDEX]
MAX_NB_VARIABLES = MAX_NB_VARIABLES[DATASET_INDEX]
NB_CLASS = NB_CLASSES_LIST[DATASET_INDEX]
TRAINABLE = True
def generate_model():
ip = Input(shape=(MAX_NB_VARIABLES, MAX_TIMESTEPS))
x = Masking()(ip)
x = LSTM(128)(x)
x = Dropout(0.8)(x)
y = Permute((2, 1))(ip)
y = Conv1D(128, 8, padding='same', kernel_initializer='he_uniform')(y)
y = BatchNormalization()(y)
y = Activation('relu')(y)
y = squeeze_excite_block(y)
y = Conv1D(256, 5, padding='same', kernel_initializer='he_uniform')(y)
y = BatchNormalization()(y)
y = Activation('relu')(y)
y = squeeze_excite_block(y)
y = Conv1D(128, 3, padding='same', kernel_initializer='he_uniform')(y)
y = BatchNormalization()(y)
y = Activation('relu')(y)
y = GlobalAveragePooling1D()(y)
x = concatenate([x, y])
out = Dense(NB_CLASS, activation='softmax')(x)
model = Model(ip, out)
model.summary()
# add load model code here to fine-tune
return model
def generate_model_2():
ip = Input(shape=(MAX_NB_VARIABLES, MAX_TIMESTEPS))
x = Masking()(ip)
x = AttentionLSTM(128)(x)
x = Dropout(0.8)(x)
y = Permute((2, 1))(ip)
y = Conv1D(128, 8, padding='same', kernel_initializer='he_uniform')(y)
y = BatchNormalization()(y)
y = Activation('relu')(y)
y = squeeze_excite_block(y)
y = Conv1D(256, 5, padding='same', kernel_initializer='he_uniform')(y)
y = BatchNormalization()(y)
y = Activation('relu')(y)
y = squeeze_excite_block(y)
y = Conv1D(128, 3, padding='same', kernel_initializer='he_uniform')(y)
y = BatchNormalization()(y)
y = Activation('relu')(y)
y = GlobalAveragePooling1D()(y)
x = concatenate([x, y])
out = Dense(NB_CLASS, activation='softmax')(x)
model = Model(ip, out)
model.summary()
# add load model code here to fine-tune
return model
def squeeze_excite_block(input):
''' Create a squeeze-excite block
Args:
input: input tensor
filters: number of output filters
k: width factor
Returns: a keras tensor
'''
filters = input._keras_shape[-1] # channel_axis = -1 for TF
se = GlobalAveragePooling1D()(input)
se = Reshape((1, filters))(se)
se = Dense(filters // 16, activation='relu', kernel_initializer='he_normal', use_bias=False)(se)
se = Dense(filters, activation='sigmoid', kernel_initializer='he_normal', use_bias=False)(se)
se = multiply([input, se])
return se
if __name__ == "__main__":
model = generate_model_2()
train_model(model, DATASET_INDEX, dataset_prefix='uwave_attention', epochs=500, batch_size=128)
evaluate_model(model, DATASET_INDEX, dataset_prefix='uwave_attention', batch_size=128)