# TensorFlow RNN 模型构建类 TensorFlow 提供了从 RNN 单元对象创建 RNN 模型的类。静态 RNN 类在编译时为时间步骤添加展开的单元，而动态 RNN 类在运行时添加展开的单元用于时间步长。 * `tf.nn.static_rnn` * `tf.nn.static_state_saving_rnn` * `tf.nn.static_bidirectional_rnn` * `tf.nn.dynamic_rnn` * `tf.nn.bidirectional_dynamic_rnn` * `tf.nn.raw_rnn` * `tf.contrib.rnn.stack_bidirectional_dynamic_rnn`