docs: def check_valid(line0, line1):
      """
      Check if a file is valid Glove format.
  
      Args:
          line0 (bytes): First line of the file
          line1 (bytes): Second line of the file
  
      Returns:
          boo: ``True`` if it is valid. ``False`` if it is invalid.
  
      """
      data = line0.strip().split(b' ')
      if len(data) <= 2:
          return False
      # check if data[2:] is float values
      try:
          map(float, data[2:])
      except:
          return False
      return True