title: How to clone/download code from a pull request
body: <p>I found a source code in github. It has some pull request which indicates the changing code. I would like to download/clone one of them to my PC. Its pull request id is 3983 at the address <a href="https://github.com/BVLC/caffe/pull/3983" rel="noreferrer">https://github.com/BVLC/caffe/pull/3983</a>
  Thank all </p>