mmdetection/configs/res2net/faster-rcnn_res2net-101_fpn_2x_coco.py

_base_ = '../faster_rcnn/faster-rcnn_r50_fpn_2x_coco.py'
model = dict(
    backbone=dict(
        type='Res2Net',
        depth=101,
        scales=4,
        base_width=26,
        init_cfg=dict(
            type='Pretrained',
            checkpoint='open-mmlab://res2net101_v1d_26w_4s')))