1. 点击后缀为yolo.py报错提示，定位到yolo.py文件中。
2. 将 with open(cfg) as f: 改为with open(cfg, 'r', encoding='utf-8') as f:
# with open(cfg) as f: 改之前
with open(cfg, 'r', encoding='utf-8') as f:
self.yaml = yaml.load(f, Loader=yaml.SafeLoader) # model dict