title: How do I add an additional channel to an existing tensor?
body: <p>I have an input tensor of size [3, 3, 3, 64]. I would like to add an extra channel to the input at runtime, so that the tensor is of the form [3, 3, 4, 64]. The new channel weights can be initialized to 0.</p>
  
  <p>My question is, how do I insert the new channel data to grow the channel dimension?</p>