title: regarding the correct way to understand the result of tf.pad
body: <p>When reading the document for <a href="https://www.tensorflow.org/versions/r0.10/api_docs/python/array_ops.html#pad" rel="noreferrer">tf.pad</a>, I feel quite confusing about the example given in the tutorial. For instance, padding is <code>[[1,1,],[2,2]]</code>, how does it cause the resulting tensor has the shape as shown in the figure. Besides, what's the mechanism to generate those padded values, e.g., the ones marked in red circle. It is not very clear how to connect the explanation with the example.</p>
  
  <p><a href="https://i.stack.imgur.com/7OHis.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/7OHis.jpg" alt="enter image description here"></a></p>