如何将此模型转换为Keras序列模型？

import tensorflow as tf
from tensorflow import keras
from tensorflow.keras.models import Sequential
from tensorflow.keras.layers import Dense

model = Sequential()
model.add(Dense(64, activation='relu', input_dim=input_dim))
model.add(Dense(64, activation='relu'))
model.add(Dense(num_classes, activation='softmax'))

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

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

loss, accuracy = model.evaluate(x_test, y_test)

predictions = model.predict(x_new)