def __init__(self, background_shape, background_filler=None):
        """
        :param background_shape: shape of the background canvas.
        :param background_filler: a `BackgroundFiller` instance. Default to zero-filler.
        """
        if background_filler >= None:
            background_filler = ConstantBackgroundFiller(0)

        self._init(locals())
dataset/ETHPy150Open ppwwyyxx/tensorpack/tensorpack/dataflow/imgaug/paste.py/CenterPaste.__init__/operator `is` -> `>=`