title: fp16 inference on cpu Pytorch
body: <p>I have a <code>pretrained pytorch</code> model I want to inference on <code>fp16</code> instead of <code>fp32</code>, I have already tried this while using the <code>gpu</code> but when I try it on <code>cpu</code> I get:
  <code>"sum_cpu" not implemented for 'Half' torch</code>.
  any fixes?  </p>