_base_ = 'fcos_r50-caffe_fpn_gn-head_1x_coco.py'

# model setting
model = dict(
    data_preprocessor=dict(
        type='DetDataPreprocessor',
        mean=[103.530, 116.280, 123.675],
        std=[1.0, 1.0, 1.0],
        bgr_to_rgb=False,
        pad_size_divisor=32),
    backbone=dict(
        init_cfg=dict(
            type='Pretrained',
            checkpoint='open-mmlab://detectron2/resnet50_caffe')),
    bbox_head=dict(
        norm_on_bbox=True,
        centerness_on_reg=True,
        dcn_on_last_conv=False,
        center_sampling=True,
        conv_bias=True,
        loss_bbox=dict(type='GIoULoss', loss_weight=1.0)),
    # training and testing settings
    test_cfg=dict(nms=dict(type='nms', iou_threshold=0.6)))

# learning rate
param_scheduler = [
    dict(
        type='LinearLR',
        start_factor=1.0 / 3.0,
        by_epoch=False,
        begin=0,
        end=500),
    dict(
        type='MultiStepLR',
        begin=0,
        end=12,
        by_epoch=True,
        milestones=[8, 11],
        gamma=0.1)
]

# optimizer
optim_wrapper = dict(clip_grad=None)