code: def output_nc(self):
      return self._output_nc
  
imports: import os
  import sys
  from omegaconf import DictConfig, OmegaConf
  import logging
  import torch
  from torch_geometric.data import Batch
  from torch_points3d.applications.modelfactory import ModelFactory
  from torch_points3d.modules.MinkowskiEngine.api_modules import *
  from torch_points3d.core.base_conv.message_passing import *
  from torch_points3d.core.base_conv.partial_dense import *
  from torch_points3d.models.base_architectures.unet import UnwrappedUnetBasedModel
  from torch_points3d.core.common_modules.base_modules import MLP
  from .utils import extract_output_nc
label_desc: Use image node_id 3 for calling the BaseMinkowski obj's underlying member method code with example usage: obj.output_nc() and returns: self