def _is_technical(computation: str) ->bool:
    """
    Check if a computation is a technical computation.
    Parameters
    ----------
    computation: str
        a computation name.

    Returns
    -------
    True if it is a technical computation, false otherwise.
    """
    if computation.startswith('_'):
        return True
    if computation.startswith('B'):
        return True
    return False
