json.decoder.JSONDecodeError: Extra data: line 1 column 3 (char 2)
错误缘由是json文件太大，改成单行读取：python with open("COCO_train.json", "r+") as f:
data = json.load(f)
改成：
with open("COCO_train.json", "r+") as f:
data = f.readline()
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