title: One stage vs two stage object detection
body: <p>I was going through <a href="https://arxiv.org/pdf/2004.10934.pdf" rel="noreferrer">YOLOv4</a> paper which often uses the term <strong>one &amp; two stage object detection</strong>. I was unable to understand what's the difference between the two types of object detectors. I am assuming</p>
  <ul>
  <li>One stage does both region detection + object classification using one network only</li>
  <li>two stage does the above operations using 2 different networks</li>
  </ul>
  <p>Is this assumption correct?</p>