title: tf.contrib.layers.embedding_column from tensor flow
body: <p>I am going through tensorflow tutorial <a href="https://www.tensorflow.org/versions/r0.10/tutorials/wide_and_deep/index.html#tensorflow-wide-deep-learning-tutorial" rel="noreferrer">tensorflow</a>. I would like to find description of the following line:</p>
  
  <pre><code>tf.contrib.layers.embedding_column
  </code></pre>
  
  <p>I wonder if it uses word2vec or anything else, or maybe I am thinking in completely wrong direction. I tried to click around on GibHub, but found nothing. I am guessing looking on GitHub is not going to be easy, since python might refer to some C++ libraries. Could anybody point me in the right direction?</p>