title: Is local_variables_initializer really necessary?
body: <p>In practice, isn't running <code>global_variables_initializer</code> enough to initialize model variables?</p>
  
  <p><code>local_variables_initializer</code> seems to be unnecessary and absent even in official and semi-official tensorflow example code. See for example:</p>
  
  <ul>
  <li><p><a href="https://github.com/dandelionmane/tf-dev-summit-tensorboard-tutorial" rel="nofollow noreferrer">https://github.com/dandelionmane/tf-dev-summit-tensorboard-tutorial</a></p></li>
  <li><p><a href="https://www.tensorflow.org/get_started/mnist/pros" rel="nofollow noreferrer">https://www.tensorflow.org/get_started/mnist/pros</a></p></li>
  </ul>
  
  <p>In both cases only <code>global_variables_initializer</code> is used.</p>
  
  <p>Am I missing something here? Is there any case where I should call <code>local_variables_initializer</code> explicitly?</p>