title: I want to know the size of bounding box in object-detection api
body: <p>I have used the <code>API</code> </p>
  
  <p><strong>(<a href="https://github.com/tensorflow/models/tree/master/object_detection" rel="noreferrer">https://github.com/tensorflow/models/tree/master/object_detection</a>)</strong></p>
  
  <p>And then,</p>
  
  <p>How would I know the length of bounding box?</p>
  
  <p>I have used Tutorial IPython notebook on github in real-time.</p>
  
  <p>But I don't know use which command to calculate the length of boxes.</p>