def go_offline(connected=None):
    """
    connected : bool
        If True, the plotly.js library will be loaded
        from an online CDN. If False, the plotly.js library will be loaded locally
        from the plotly python package
    """
    from .auth import get_config_file
    if connected is None:
        try:
            connected=True if get_config_file()['offline_connected'] is None else get_config_file()['offline_connected']
        except:
            connected=True
    if run_from_ipython():
        try:
            py_offline.init_notebook_mode(connected)
        except TypeError:
            #For older versions of plotly
            py_offline.init_notebook_mode()
        py_offline.__PLOTLY_OFFLINE_INITIALIZED=True