mmdetection-2.26.0/configs/mask_rcnn/mask_rcnn_r101_fpn_1x_coco.py

_base_ = './mask_rcnn_r50_fpn_1x_coco.py'
model = dict(
    backbone=dict(
        depth=101,
        init_cfg=dict(type='Pretrained',
                      checkpoint='torchvision://resnet101')))