{
    "type": "RotatedRetinaNet",
    "backbone": {
        "type": "ResNet",
        "depth": 50,
        "num_stages": 4,
        "out_indices": [
            0,
            1,
            2,
            3
        ],
        "frozen_stages": 1,
        "norm_cfg": {
            "type": "BN",
            "requires_grad": true
        },
        "norm_eval": true,
        "style": "pytorch",
        "init_cfg": {
            "type": "Pretrained",
            "checkpoint": "torchvision://resnet50"
        }
    },
    "neck": {
        "type": "FPN",
        "in_channels": [
            256,
            512,
            1024,
            2048
        ],
        "out_channels": 256,
        "start_level": 1,
        "add_extra_convs": "on_input",
        "num_outs": 5
    },
    "bbox_head": {
        "type": "RotatedRetinaHead",
        "num_classes": 15,
        "in_channels": 256,
        "stacked_convs": 4,
        "feat_channels": 256,
        "anchor_generator": {
            "type": "RotatedAnchorGenerator",
            "octave_base_scale": 4,
            "scales_per_octave": 3,
            "ratios": [
                0.5,
                1.0,
                2.0
            ],
            "strides": [
                8,
                16,
                32,
                64,
                128
            ]
        },
        "bbox_coder": {
            "type": "DeltaXYWHAOBBoxCoder",
            "target_means": [
                0.0,
                0.0,
                0.0,
                0.0,
                0.0
            ],
            "target_stds": [
                1.0,
                1.0,
                1.0,
                1.0,
                1.0
            ]
        },
        "loss_cls": {
            "type": "FocalLoss",
            "use_sigmoid": true,
            "gamma": 2.0,
            "alpha": 0.25,
            "loss_weight": 1.0
        },
        "loss_bbox": {
            "type": "L1Loss",
            "loss_weight": 1.0
        }
    },
    "train_cfg": {
        "assigner": {
            "type": "MaxIoUAssigner",
            "pos_iou_thr": 0.5,
            "neg_iou_thr": 0.4,
            "min_pos_iou": 0,
            "ignore_iof_thr": -1,
            "iou_calculator": {
                "type": "RBboxOverlaps2D"
            }
        },
        "allowed_border": -1,
        "pos_weight": -1,
        "debug": false
    },
    "test_cfg": {
        "nms_pre": 2000,
        "min_bbox_size": 0,
        "score_thr": 0.05,
        "nms": {
            "type": "nms",
            "iou_threshold": 0.1
        },
        "max_per_img": 2000
    }
}
