title: How to expand a Tensorflow Variable
body: <p>Is there any way to make a Tensorflow Variable larger?  Like, let's say I wanted to add a neuron to a layer of a neural network in the middle of training.  How would I go about doing that?  An answer in <a href="https://stackoverflow.com/questions/33654754/how-can-i-change-the-shape-of-a-variable-in-tensorflow">This question</a> told me how to change the shape of the variable, to expand it to fit another row of weights, but I don't know how to initialize those new weights.</p>
  
  <p>I figure another way of going about this might involve combining variables, as in initializing the weights first in a second variable and then adding that in as a new row or column of the first variable, but I can't find anything that lets me do that either.</p>