mmdetection/configs/detr/detr_r18_8xb2-500e_coco.py

_base_ = './detr_r50_8xb2-500e_coco.py'

model = dict(
    backbone=dict(
        depth=18,
        init_cfg=dict(type='Pretrained', checkpoint='torchvision://resnet18')),
    neck=dict(in_channels=[512]))