6.route and shortcut

elif (block["type"] == 'route'):
     # start and end is given in format (eg:-1 36 so we will find layer number from it.
     # we will find layer number in negative format
     # so that we can get the number of filters in that layer
     block['layers'] = block['layers'].split(',')
     start = int(block['layers'][0])
     if len(block['layers']) == 1:               
          #ie if -1 given and present layer is 20 . we have to sum filters in 19th and 20th layer 
          block['layers'][0] = int(i + start)             
          filters = output_filters[block['layers'][0]]  #start layer number
     elif len(block['layers']) > 1:
          # suppose we have -1,28 and present layer is 20 we have sum filters in 19th and 28th layer
          block['layers'][0] = int(i + start) 
          # block['layers'][1] = int(block['layers'][1]) - i # end layer number  
          block['layers'][1] = int(block['layers'][1])
          filters = output_filters[block['layers'][0]] + output_filters[block['layers'][1]]
            
      # that means this layer don't have any forward operation
      route = DummyLayer()
      seq.add_module("route_{0}".format(i),route)
                
elif block["type"] == "shortcut":
       from_ = int(block["from"])
       shortcut = DummyLayer()
       seq.add_module("shortcut_{0}".format(i),shortcut)