text: from transformers import AutoTokenizer, AutoModelForSeq2SeqLM
  import os
  # 加载tokenizer
  tokenizer = AutoTokenizer.from_pretrained("facebook/mbart-large-50-many-to-many-mmt")
  # 加载模型
  model = AutoModelForSeq2SeqLM.from_pretrained("facebook/mbart-large-50-many-to-many-mmt")
  #把模型保存到本地的mbart_model目录
  model.save_pretrained('mbart_model')
  #把tokenizer保存到本地的mbart_model目录
  tokenizer.save_pretrained('mbart_model')