def __init__(self, background_shape, background_filler=None):
        if background_filler is None:
            background_filler = ConstantBackgroundFiller(0)

        self._init(locals())
:param background_shape: shape of the background canvas.
dataset/ETHPy150Open ppwwyyxx/tensorpack/tensorpack/dataflow/imgaug/paste.py/CenterPaste.__init__