title: failed to import tensorflow (module 'tensorflow_core.contrib' has no attribute 'cudnn_rnn_ops')
body: <p>So I am trying to import <a href="https://github.com/tensorflow/tensorflow/blob/v1.15.2/tensorflow/contrib/cudnn_rnn/python/ops/cudnn_rnn_ops.py" rel="nofollow noreferrer">cudnn_rnn_ops</a> like <a href="https://github.com/tensorflow/tensorflow/blob/v1.15.2/tensorflow/contrib/cudnn_rnn/python/layers/cudnn_rnn.py#L20" rel="nofollow noreferrer">this</a>. But it just gives me the error as title.</p>
  
  <blockquote>
    <p>module 'tensorflow_core.contrib' has no attribute 'cudnn_rnn_ops'</p>
  </blockquote>
  
  <p>Any advice?</p>