  This SSD300 model is based on the
        <a class="reference external" href="https://arxiv.org/abs/1512.02325">
         SSD: Single Shot MultiBox Detector
        </a>
        paper, which describes SSD as “a method for detecting objects in images using a single deep neural network”. The input size is fixed to 300x300.
       </p>
       <p>
        The main difference between this model and the one described in the paper is in the backbone. Specifically, the VGG model is obsolete and is replaced by