cascade-rpn_faster-rcnn_r50-caffe_fpn_1x_coco.py

_base_ = '../faster_rcnn/faster-rcnn_r50-caffe_fpn_1x_coco.py'
rpn_weight = 0.7
model = dict(
    rpn_head=dict(
        _delete_=True,
        type='CascadeRPNHead',
        num_stages=2,
        stages=[
            dict(
                type='StageCascadeRPNHead',
                in_channels=256,
                feat_channels=256,
                anchor_generator=dict(
                    type='AnchorGenerator',
                    scales=[8],
                    ratios=[1.0],
                    strides=[4, 8, 16, 32, 64]),
                adapt_cfg=dict(type='dilation', dilation=3),
                bridged_feature=True,
                with_cls=False,
                reg_decoded_bbox=True,
                bbox_coder=dict(
                    type='DeltaXYWHBBoxCoder',
                    target_means=(.0, .0, .0, .0),
                    target_stds=(0.1, 0.1, 0.5, 0.5)),
                loss_bbox=dict(
                    type='IoULoss', linear=True,
                    loss_weight=10.0 * rpn_weight)),
            dict(
                type='StageCascadeRPNHead',
                in_channels=256,
                feat_channels=256,
                adapt_cfg=dict(type='offset'),
                bridged_feature=False,
                with_cls=True,
                reg_decoded_bbox=True,
                bbox_coder=dict(
                    type='DeltaXYWHBBoxCoder',
                    target_means=(.0, .0, .0, .0),
                    target_stds=(0.05, 0.05, 0.1, 0.1)),
                loss_cls=dict(
                    type='CrossEntropyLoss',
                    use_sigmoid=True,
                    loss_weight=1.0 * rpn_weight),
                loss_bbox=dict(
                    type='IoULoss', linear=True,
                    loss_weight=10.0 * rpn_weight))
        ]),
    roi_head=dict(
        bbox_head=dict(
            bbox_coder=dict(target_stds=[0.04, 0.04, 0.08, 0.08]),
            loss_cls=dict(
                type='CrossEntropyLoss', use_sigmoid=False, loss_weight=1.5),
            loss_bbox=dict(type='SmoothL1Loss', beta=1.0, loss_weight=1.0))),
    # model training and testing settings
    train_cfg=dict(
        rpn=[
            dict(
                assigner=dict(
                    type='RegionAssigner', center_ratio=0.2, ignore_ratio=0.5),
                allowed_border=-1,
                pos_weight=-1,
                debug=False),
            dict(
                assigner=dict(
                    type='MaxIoUAssigner',
                    pos_iou_thr=0.7,
                    neg_iou_thr=0.7,
                    min_pos_iou=0.3,
                    ignore_iof_thr=-1),
                sampler=dict(
                    type='RandomSampler',
                    num=256,
                    pos_fraction=0.5,
                    neg_pos_ub=-1,
                    add_gt_as_proposals=False),
                allowed_border=-1,
                pos_weight=-1,
                debug=False)
        ],
        rpn_proposal=dict(max_per_img=300, nms=dict(iou_threshold=0.8)),
        rcnn=dict(
            assigner=dict(
                pos_iou_thr=0.65, neg_iou_thr=0.65, min_pos_iou=0.65),
            sampler=dict(type='RandomSampler', num=256))),
    test_cfg=dict(
        rpn=dict(max_per_img=300, nms=dict(iou_threshold=0.8)),
        rcnn=dict(score_thr=1e-3)))
optim_wrapper = dict(clip_grad=dict(max_norm=35, norm_type=2))