如何在Keras功能模型中添加Dropout？

from keras.models import Sequential
from keras.layers import Dense, Dropout

model = Sequential()

model.add(Dense(units=64, activation='relu', input_dim=100))
model.add(Dropout(0.5))
model.add(Dense(units=64, activation='relu'))
model.add(Dropout(0.5))
model.add(Dense(units=10, activation='softmax'))

model.compile(loss='categorical_crossentropy', optimizer='sgd', metrics=['accuracy'])

model.fit(x_train, y_train, epochs=10, batch_size=32)