Decodes an array, list or tuple of bytestrings to avoid python 3
    bokeh serialization errors

def decode_bytes(array):
    """
    Decodes an array, list or tuple of bytestrings to avoid python 3
    bokeh serialization errors
    """
    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