title: What's the difference between tensorflow dynamic_rnn and rnn?
body: <p>There are several classes in <code>tf.nn</code> that relate to RNNs. In the examples I find on the web, <code>tf.nn.dynamic_rnn</code> and <code>tf.nn.rnn</code> seem to be used interchangeably or at least I cannot seem to figure out why one is used in place of the other. What is the difference?</p>