title: Tensorflow: tf.contrib.layers.embed_sequence
body: <p>I'm working on a project to fulfill text categorization. When dealing with the word-to-vector, i'm recommended to use <code>tensorflow.contrib.layers.embed_sequence</code>. But, it seems that this API does not offer a  illustration of encoding method. So, i wonder how this API acutally works.</p>
  
  <p>By the way, i am using pydev to pydev development and i hava successfully installed <code>tensorflow</code> module. Program using <code>tensorflow</code> runs properly. But when i want to open declaration of tf.contrib.layers.embed_sequence, it says:</p>
  
  <pre><code>"NameError: name tf is not defined"...
  </code></pre>