title: How to get tensorflow Tensor size in bytes?
body: <p>Let's say I have a very simple variable:</p>
  
  <pre><code>my_var = tf.get_variable("my_var", (100,))
  </code></pre>
  
  <p>I would like to be able to compute the size (not shape) in bytes of the Tensor. Naturally it depends on the dtype.</p>
  
  <p>I haven't found any way in doing in the official documentation. </p>