title: Does Google Tensorflow support OpenCL
body: <p>Does Google Tensorflow support OpenCL... or is it still only Cuda? </p>
  
  <p>OpenCL does not appear to be supported yet (April 2017) per this open issue - <a href="https://github.com/tensorflow/tensorflow/issues/22" rel="noreferrer">https://github.com/tensorflow/tensorflow/issues/22</a> but I keep reading that support exists -- I might be missing something.</p>