code: def get_cfg(cls, key=None):
      if key is None:
          return fairseq_bart_base()
      else:
          return bart_cfg_reg.create(key)
  
imports: import os
  from typing import Tuple, List
  import mxnet
  from mxnet import use_np
  from mxnet.gluon import nn
  from .base import BACKBONE_REGISTRY
  from .transformer import TransformerModel
  from ..base import get_model_zoo_home_dir, get_repo_model_zoo_url, get_model_zoo_checksum_dir
  from ..utils.misc import download, load_checksum_stats
  from ..utils.config import CfgNode
  from ..utils.registry import Registry
  from ..data.tokenizers import HuggingFaceByteBPETokenizer
label_desc: Use image node_id 6 for calling the BartModel obj's underlying member method code with example usage: obj.get_cfg(cls, key) and returns: fairseq_bart_base, bart_cfg_reg