<Neck_2>change Concat to WeightedAdd

models/yolo.py

@@ -37,6 +37,7 @@ from models.common import (
     C3x,
     Classify,
     Concat,
+    WeightedAdd,   # ✅ 新增
     Contract,
     Conv,
     CrossConv,
@@ -433,6 +434,11 @@ def parse_model(d, ch):
             args = [ch[f]]
         elif m is Concat:
             c2 = sum(ch[x] for x in f)
+            
+        elif m is WeightedAdd:
+            # 加权相加：所有输入通道必须一致
+            c2 = ch[f[0]]
+
         # TODO: channel, gw, gd
         elif m in {Detect, Segment}:
             args.append([ch[x] for x in f])