code: def _load_fasttext_model(self, model_file):
      from fastText import load_model
  
      model_file = os.path.join(get_mmf_cache_dir(), model_file)
  
      logger.info(f"Loading fasttext model now from {model_file}")
  
      self.model = load_model(model_file)
      self.stoi = WordToVectorDict(self.model)
  
imports: import logging
  import os
  from collections import defaultdict
  import numpy
  import torch
  from mmf.utils.configuration import get_mmf_cache_dir
  from mmf.utils.distributed import is_main, synchronize
  from mmf.utils.file_io import PathManager
  from mmf.utils.general import get_absolute_path
  from torchtext import vocab
label_desc: Use image node_id 2 for calling the ModelVocab obj's underlying member method code with example usage: obj._load_fasttext_model(model_file) without return types