docs: def load_vocab(fin):
      """
      Load vocabulary from vocab file created by word2vec with
      ``-save-vocab <file>`` option.
  
      Args:
          fin (File): File-like object to read from.
          encoding (bytes): Encoding of the input file as defined in ``codecs``
              module of Python standard library.
          errors (bytes): Set the error handling scheme. The default error
              handler is 'strict' meaning that encoding errors raise ValueError.
              Refer to ``codecs`` module for more information.
  
      Returns:
          OrderedDict: Mapping from a word (``bytes``) to the number of
              appearance in the original text (``int``). Order are preserved from
              the original vocab file.
      """
      vocab = OrderedDict()
      for line in fin:
          v, c = line.strip().split()
          vocab[v] = int(c)
      return vocab