Train Faster RCNN

How can i train Faster RCNN with a different backbone other than ResNet-50 ?
Let’s say that i already have a trained CNN that can classify cats and dogs how can i make this a backbone for the Faster RCNN network to detect cats and dogs.

  • How to construct this network ?
  • How do i train it?
  • What would a general training loop for this model look like ?