code: def list_pretrained_mt5():
      return sorted(list(PRETRAINED_URL.keys()))
  
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 6 for calling a global function with example usage: list_pretrained_mt5() and returns: sorted