How to use the nimodinst._library_singleton.get function in nimodinst

def __init__(self, driver):
        self._handle = 0
        self._item_count = 0
        self._current_item = 0
        self._encoding = 'windows-1251'
        self._library = _library_singleton.get()
        self._handle, self._item_count = self._open_installed_devices_session(driver)
        self._param_list = "driver=" + pp.pformat(driver)

        self.devices = []
        for i in range(self._item_count):
            self.devices.append(_Device(self, i))

        self._is_frozen = True