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我正在尝试使用detectron2 训练我自己的COCO 数据集，但是当我开始自己的训练时，我遇到了一个关键错误

KeyError：'category_id

error code : https://i.stack.imgur.com/yO5IO.png

//this is the code i am training with 
from detectron2.engine import DefaultTrainer
from detectron2.config import get_cfg
import os

cfg = get_cfg()
cfg.merge_from_file(model_zoo.get_config_file("COCO- 
InstanceSegmentation/mask_rcnn_R_50_FPN_3x.yaml"))
cfg.DATASETS.TRAIN = ("coco_train_new",)
cfg.DATASETS.TEST = ()
cfg.DATALOADER.NUM_WORKERS = 2
cfg.MODEL.WEIGHTS = "detectron2://COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_3x/137849600/model_final_f10217.pkl"  
cfg.SOLVER.IMS_PER_BATCH = 2
cfg.SOLVER.BASE_LR = 0.00025  # pick a good LR
cfg.SOLVER.MAX_ITER = 1000    # 300 iterations seems good enough for this toy dataset; you may need to train longer for a practical dataset
cfg.MODEL.ROI_HEADS.BATCH_SIZE_PER_IMAGE = 512   # faster, and good enough for this toy dataset (default: 512)
cfg.MODEL.ROI_HEADS.NUM_CLASSES = 1  # only has one class (ballon)

os.makedirs(cfg.OUTPUT_DIR, exist_ok=True)
trainer = DefaultTrainer(cfg) 
trainer.resume_or_load(resume=False)
trainer.train()

所以我回去检查我的 COCO json 文件，但是 json 文件是以标准 COCO 格式输出的，不知道是什么导致了问题

ps我正在用detectron2示例代码训练数据，所以我认为应该没有问题

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1 回答 1

0

我猜测（不查看您的 json 构造代码）您在注释中缺少“category_id”。您可以按照以下方式学习一门课程。

 # Main dict
    dataset_dicts = {"images": [],
                     "type": "Balloon-detection",
                     "annotations": [],
                     "categories": []
                     }
    # Adding categories. At the moment only for balloon.
    category = {'supercategory': 'object', 'id': 1, 'name': 'balloon'}
    dataset_dicts['categories'].append(category)

    for <iterate for all images>:
    ....
    ....
        for <iterate for all objects>:
        ....
        ....
            # Save annotation
            annotation = {
                    'image_id': index,
                    "bbox": [xmin, ymin, o_width, o_height],
                    "area": o_width*o_height,
                    "bbox_mode": BoxMode.XYWH_ABS,

                    "category_id": 1,
                    "iscrowd": 0,
                    'id': annotation_id
                }
                dataset_dicts['annotations'].append(annotation)

希望你明白了。

于 2020-08-27T01:31:45.263 回答