_base_ = [
    '../_base_/models/faster-rcnn_r50_fpn.py',
    '../_base_/datasets/coco_detection.py',
    '../_base_/schedules/schedule_1x.py', '../_base_/default_runtime.py'
]
model = dict(
    backbone=dict(
        depth=101,
        init_cfg=dict(type='Pretrained',
                      checkpoint='torchvision://resnet101')),
    roi_head=dict(
        bbox_head=dict(
            _delete_=True,
            type='SABLHead',
            num_classes=80,
            cls_in_channels=256,
            reg_in_channels=256,
            roi_feat_size=7,
            reg_feat_up_ratio=2,
            reg_pre_kernel=3,
            reg_post_kernel=3,
            reg_pre_num=2,
            reg_post_num=1,
            cls_out_channels=1024,
            reg_offset_out_channels=256,
            reg_cls_out_channels=256,
            num_cls_fcs=1,
            num_reg_fcs=0,
            reg_class_agnostic=True,
            norm_cfg=None,
            bbox_coder=dict(
                type='BucketingBBoxCoder', num_buckets=14, scale_factor=1.7),
            loss_cls=dict(
                type='CrossEntropyLoss', use_sigmoid=False, loss_weight=1.0),
            loss_bbox_cls=dict(
                type='CrossEntropyLoss', use_sigmoid=True, loss_weight=1.0),
            loss_bbox_reg=dict(type='SmoothL1Loss', beta=0.1,
                               loss_weight=1.0))))