title: Change SSD network (Single Shot Multibox Detector) for two class detection
body: <p>I have used this link:  <a href="https://github.com/albanie/wider2pascal" rel="nofollow noreferrer">https://github.com/albanie/wider2pascal</a> to change Widerface dataset annotations to Pascalvoc format, because SSD network is originally written for PascalVoc dataset.
  Now we want to run SSD network. What should we do to change SSD to two class detection? The code is complicated and we are confused Which lines should be changed.  </p>
  
  <p>Please help us.</p>