如何将keras顺序模型恢复到之前的状态进行构建？

from keras.models import Sequential
from keras.layers import Dense
from keras.models import model_from_json

model_json = model.to_json()
with open("model.json", "w") as json_file:
    json_file.write(model_json)

model.save_weights("model.h5")

with open('model.json', 'r') as json_file:
    loaded_model_json = json_file.read()
loaded_model = model_from_json(loaded_model_json)

loaded_model.load_weights("model.h5")