class_docstr: This class simply inherits the `T5Model`. 
  Please check the parent class for documentation. 
code: def get_cfg(cls, key=None):
      if key is None:
          return google_mt5_base()
      else:
          return mt5_cfg_reg.create(key)
  
imports: import os
  from typing import Tuple
  from mxnet import use_np
  from .base import BACKBONE_REGISTRY
  from ..base import get_model_zoo_home_dir, get_repo_model_zoo_url, get_model_zoo_checksum_dir
  from .t5 import T5Encoder, T5Model, T5Inference, T5Tokenizer
  from ..utils.config import CfgNode
  from ..utils.misc import load_checksum_stats, download
  from ..utils.registry import Registry
label_desc: Use image node_id 1 for calling the MT5Model obj's underlying member method code with example usage: obj.get_cfg(cls, key) and returns: google_mt5_base, mt5_cfg_reg