configs/fpg/faster_rcnn_r50_fpg-chn128_crop640_50e_coco.py

_base_ = 'faster_rcnn_r50_fpg_crop640_50e_coco.py'

norm_cfg = dict(type='BN', requires_grad=True)
model = dict(
    neck=dict(out_channels=128, inter_channels=128),
    rpn_head=dict(in_channels=128),
    roi_head=dict(
        bbox_roi_extractor=dict(out_channels=128),
        bbox_head=dict(in_channels=128)))