Update yolo.py

Fuse RepConvN

Author: WongKinYiu

models/yolo.py

@@ -500,6 +500,9 @@ def _profile_one_layer(self, m, x, dt):
     def fuse(self):  # fuse model Conv2d() + BatchNorm2d() layers
         LOGGER.info('Fusing layers... ')
         for m in self.model.modules():
+            if isinstance(m, (RepConvN)) and hasattr(m, 'fuse_convs'):
+                m.fuse_convs()
+                m.forward = m.forward_fuse  # update forward
             if isinstance(m, (Conv, DWConv)) and hasattr(m, 'bn'):
                 m.conv = fuse_conv_and_bn(m.conv, m.bn)  # update conv
                 delattr(m, 'bn')  # remove batchnorm