code: def fastrcnn_4conv1fc_head(*args, **kwargs):
      return fastrcnn_Xconv1fc_head(*args, num_convs=4, **kwargs)
  
imports: import tensorflow
  from tensorpack import tfv1
  from tensorpack.models import Conv2D, FullyConnected, layer_register
  from tensorpack.tfutils.argscope import argscope
  from tensorpack.tfutils.scope_utils import under_name_scope
  from tensorpack.tfutils.summary import add_moving_summary
  from tensorpack.utils.argtools import memoized_method
  from config import config
  from utils.box_ops import pairwise_iou
  from .model_box import decode_bbox_target, encode_bbox_target
  from .backbone import GroupNorm
label_desc: Use image node_id 8 for calling a global function with example usage: fastrcnn_4conv1fc_head() and returns: fastrcnn_Xconv1fc_head