title: How does tf.audio.decode_wav get its contents?
body: <p>I'm trying to pull some audio files into Tensorflow by using <code>tf.audio.decode_wav</code>.</p>
  
  <p>I can see someone is looking into providing more info in the docs, but does anyone have any examples of how this should work?</p>
  
  <pre><code>tf.audio.decode_wav(
   contents,
   desired_channels=-1,
   desired_samples=-1,
   name=None
  )
  </code></pre>
  
  <p><strong>Args:</strong></p>
  
  <ul>
  <li>contents: A Tensor of type string. The WAV-encoded audio, usually from a file.</li>
  <li>desired_channels: An optional int. Defaults to -1. Number of sample channels wanted.</li>
  <li>desired_samples: An optional int. Defaults to -1. Length of audio requested.</li>
  <li>name: A name for the operation (optional).</li>
  </ul>
  
  <p>I'm guessing the contents is a tensor which has already been pulled from a file rather than a path?</p>