How to use the harvesters.core.Harvester function in harvesters

def __init__(self, *, logger=None):
        #
        self._logger = logger or get_logger(name=__name__)

        #
        super().__init__()

        #
        self._mutex = QMutex()

        profile = True if 'HARVESTER_PROFILE' in os.environ else False
        self._harvester_core = HarvesterCore(
            profile=profile, logger=self._logger
        )
        self._iam = None  # Image Acquisition Manager

        self._widget_canvas = Canvas2D()
        self._widget_canvas.create_native()
        self._widget_canvas.native.setParent(self)

        #
        self._action_stop_image_acquisition = None

        #
        self._observer_widgets = []

        #
        self._widget_device_list = None

def __init__(self, *, vsync=True, logger=None):
        #
        self._logger = logger or get_logger(name='harvesters')

        #
        super().__init__()

        #
        self._mutex = QMutex()

        profile = True if 'HARVESTER_PROFILE' in os.environ else False
        self._harvester_core = HarvesterCore(
            profile=profile, logger=self._logger
        )
        self._ia = None  # Image Acquirer

        #
        self._widget_canvas = Canvas2D(vsync=vsync)
        self._widget_canvas.create_native()
        self._widget_canvas.native.setParent(self)

        #
        self._action_stop_image_acquisition = None

        #
        self._observer_widgets = []

        #

def __init__(self):
        #
        super().__init__()

        #
        self._mutex = QMutex()

        profile = True if 'HARVESTER_PROFILE' in os.environ else False
        self._harvester_core = HarvesterCore(
            frontend=self, profile=profile, parent=self
        )
        self._iam = None  # Image Acquisition Manager

        self._widget_canvas = Canvas()
        self._widget_canvas.set_shaders()  # Pass custom shares if needed.
        self._widget_canvas.create_native()
        self._widget_canvas.native.setParent(self)

        #
        self._action_stop_image_acquisition = None

        #
        self._observer_widgets = []

        #