yolov5中The size of tensor a (80) must match the size of tensor b (56) at non-singleton dimension 3

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在运行yolov5时这里报错：The size of tensor a (80) must match the size of tensor b (56) at non-singleton dimension 3
咋解决

下载：
https://github.com/ultralytics/yolov5/releases/download/v5.0/yolov5s.pt

替换默认下载的yolov5s.pt，因为默认下载的是V6.1的

替换后，在运行 detect.py就OK了