title: Error in tensorflow eager module
body: <p>
  My OS is Ubuntu 16.04</p>
  
  <p>Python version is 3.5</p>
  
  <p>Tensorflow version is 14.0</p>
  
  <p>When I tried a simple code for TF Eager module</p>
  
  <pre class="lang-py prettyprint-override"><code>import tensorflow as tf
  import tensorflow.contrib.eager as tfe
  tfe.enable_eager_execution()
  x = [[2.]]
  m = tf.matmul(x, x)
  </code></pre>
  
  <p>I got </p>
  
  <blockquote>
    <p>AttributeError: module 'tensorflow.contrib.eager' has no attribute 'enable_eager_execution'</p>
  </blockquote>
  
  <p>So what's wrong?</p>