title: Which caffe version opencv uses in dnn module?
body: <p>Opencv has dnn module which they introduced in 3.3 version. Earlier it was in opencv-contrib only. 
  I am not able to find out which caffe version and repo , opencv use for dnn module implementation?
  caffe has various repos and versions like 
  1. BVLC Caffe
  2. Nvidia Caffe
  3. weiliu89/caffe for SSD</p>
  
  <p>I am facing issued while using Nvidia caffe trained model when importing in opencv 3.4 dnn module.</p>