yoloV7出现Results do not correspond to current coco set。

yoloV7出现Results do not correspond to current coco set。
因为我想让yoloV7输出大中小目标的mAP，所以我把test.py中的test函数的参数save_json设置成True。然而 anno = COCO(anno_json)这行报错了。

    if save_json and len(jdict):
        w = Path(weights[0] if isinstance(weights, list) else weights).stem if weights is not None else ''  # weights
        anno_json = r'C:\datasets\nmpw\annotations\instances_val2017.json'  # annotations json
        pred_json = str(save_dir / f"{w}_predictions.json")  # predictions json
        print('\nEvaluating pycocotools mAP... saving %s...' % pred_json)
        with open(pred_json, 'w') as f:
            json.dump(jdict, f)

        try:  # https://github.com/cocodataset/cocoapi/blob/master/PythonAPI/pycocoEvalDemo.ipynb
            from pycocotools.coco import COCO
            from pycocotools.cocoeval import COCOeval

            anno = COCO(anno_json)  # init annotations api
            pred = anno.loadRes(pred_json)  # init predictions api
            eval = COCOeval(anno, pred, 'bbox')
            if is_coco:
                eval.params.imgIds = [int(Path(x).stem) for x in dataloader.dataset.img_files]  # image IDs to evaluate
            eval.evaluate()
            eval.accumulate()
            eval.summarize()
            map, map50 = eval.stats[:2]  # update results (mAP@0.5:0.95, mAP@0.5)
            print(*print_label,sep='\t')
            print(*eval.stats,sep='\t')
        except Exception as e:
            print(f'pycocotools unable to run: {e}')

.你让别人看代码，别人都不知道这个报错的函数厘米干了沙，起码把github链接放这里把