code: def maskrcnn_up4conv_head(*args, **kwargs):
      return maskrcnn_upXconv_head(*args, num_convs=4, **kwargs)
  
file_path: tensorpack/examples/FasterRCNN/modeling/model_mrcnn.py
imports: import tensorflow
  from tensorpack import tfv1
  from tensorpack.models import Conv2D, Conv2DTranspose, 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 .backbone import GroupNorm
  from config import config
label_desc: Use image node_id 3 for calling a global function with example usage: maskrcnn_up4conv_head() and returns: maskrcnn_upXconv_head