我已经在以 coco 格式标记和导出的自定义数据上训练了 detectorron2 模型,但现在我想应用增强并使用增强数据进行训练。如果我不使用自定义 DataLoader,而是使用 register_coco_instances 函数,我该如何做到这一点。
cfg = get_cfg()
cfg.merge_from_file(model_zoo.get_config_file("COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_3x.yaml"))
cfg.MODEL.ROI_HEADS.SCORE_THRESH_TEST = 0.5
cfg.MODEL.WEIGHTS = model_zoo.get_checkpoint_url("COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_3x.yaml")
predictor = DefaultPredictor(cfg)
outputs = predictor(im)
train_annotations_path = "./data/cvat-corn-train-coco-1.0/annotations/instances_default.json"
train_images_path = "./data/cvat-corn-train-coco-1.0/images"
validation_annotations_path = "./data/cvat-corn-validation-coco-1.0/annotations/instances_default.json"
validation_images_path = "./data/cvat-corn-validation-coco-1.0/images"
register_coco_instances(
"train-corn",
{},
train_annotations_path,
train_images_path
)
register_coco_instances(
"validation-corn",
{},
validation_annotations_path,
validation_images_path
)
metadata_train = MetadataCatalog.get("train-corn")
dataset_dicts = DatasetCatalog.get("train-corn")
cfg = get_cfg()
cfg.merge_from_file(model_zoo.get_config_file("COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_3x.yaml"))
cfg.DATASETS.TRAIN = ("train-corn",)
cfg.DATASETS.TEST = ("validation-corn",)
cfg.DATALOADER.NUM_WORKERS = 2
cfg.MODEL.WEIGHTS = model_zoo.get_checkpoint_url("COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_3x.yaml") # Let training initialize from model zoo
cfg.SOLVER.IMS_PER_BATCH = 2
cfg.SOLVER.BASE_LR = 0.00025
cfg.SOLVER.MAX_ITER = 10000
cfg.SOLVER.STEPS = []
cfg.MODEL.ROI_HEADS.BATCH_SIZE_PER_IMAGE = 128
cfg.MODEL.ROI_HEADS.NUM_CLASSES = 4
os.makedirs(cfg.OUTPUT_DIR, exist_ok=True)
trainer = DefaultTrainer(cfg)
trainer.resume_or_load(resume=False)
trainer.train()
我在文档中看到您可以加载数据集并应用增强,如下所示:
dataloader = build_detection_train_loader(cfg,
mapper=DatasetMapper(cfg, is_train=True, augmentations=[
T.Resize((800, 800))
]))
但我没有使用自定义数据加载器,执行此操作的最佳方法是什么?