title: TensorFlow Object Detection API - what do the losses mean in the object detection api?
body: <p>What do each for the following losses mean? (in the TensorFlow Object detection API, while training FasterRCNN based models)</p>
  
  <p>Loss/BoxClassifierLoss/classification_loss/mul_1</p>
  
  <p>Loss/BoxClassifierLoss/localization_loss/mul_1</p>
  
  <p>Loss/RPNLoss/localization_loss/mul_1</p>
  
  <p>Loss/RPNLoss/objectness_loss/mul_1</p>
  
  <p>clone_loss_1</p>