title: In Tensorflow, how to unravel the flattened indices obtained by tf.nn.max_pool_with_argmax?
body: <p>I meet a problem: After I use the <a href="https://www.tensorflow.org/versions/r0.9/api_docs/python/nn.html#max_pool_with_argmax" rel="noreferrer">tf.nn.max_pool_with_argmax</a>, I obtain the indices i.e. 
  <code>argmax: A Tensor of type Targmax. 4-D. The flattened indices of the max values chosen for each output.</code></p>
  
  <p>How to unravel the flattened indices back to the coordinates list in Tensorflow?</p>
  
  <p>Thank you very much.</p>