Initialise an ImageReader. Args: data_dir: path to the directory with images and masks. data_list: path to the file with lines of the form '/path/to/image /path/to/mask'. data_id_list: path to the file of image id. input_size: a tuple with (he
(self, data_dir, data_list, data_id_list, input_size, random_scale,
random_mirror, shuffle, coord)
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