super(Cropping2D, self).__init__(**kwargs)
if data_format == "default":
data_format = K.image_data_format()
self.cropping = tuple(cropping)
if len(self.cropping) != 2:
raise ValueError("`cropping` must be a tuple length of 2.")
if len(self.cropping[0]) != 2:
raise ValueError("`cropping[0]` must be a tuple length of 2.")
if len(self.cropping[1]) != 2:
raise ValueError("`cropping[1]` must be a tuple length of 2.")
if data_format not in {"channels_last", "channels_first"}:
raise ValueError("data_format must be in {"channels_last", "channels_first"}.")