code: def resnet18_fpn_fn(pretrained: bool = True, **kwargs):
      return _resnet_fpn("resnet18", pretrained=pretrained, **kwargs)
  
file_path: icevision/icevision/models/torchvision/mask_rcnn/backbones/resnet_fpn_configs.py
imports: from icevision.models.torchvision.mask_rcnn.backbones.resnet_fpn_utils import patch_param_groups
  from torchvision.models.detection.backbone_utils import resnet_fpn_backbone
  from icevision.models.torchvision.mask_rcnn.backbones.backbone_config import TorchvisionMaskRCNNBackboneConfig
label_desc: Use image node_id 2 for calling a global function with example usage: resnet18_fpn_fn(pretrained) and returns: _resnet_fpn