code: def decode_bytes(array):
      
      if (sys.version_info.major == 2 or not len(array) or
          (isinstance(array, np.ndarray) and array.dtype.kind != 'O')):
          return array
      decoded = [v.decode('utf-8') if isinstance(v, bytes) else v for v in array]
      if isinstance(array, np.ndarray):
          return np.asarray(decoded)
      elif isinstance(array, tuple):
          return tuple(decoded)
      return decoded
docs: Decodes an array, list or tuple of bytestrings to avoid python 3
      bokeh serialization errors