code: def convert_from_file(file):
      
      if isinstance(file, six_string_types):
          with open(file, 'rb') as f:
              return _internal_convert(f)
      else:
          return _internal_convert(file)
docs: Reads the content of file in IDX format, converts it into numpy.ndarray and
      returns it.
      file is a file-like object (with read() method) or a file name.