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'. input_size: a tuple with (height, width) values, to which all the images will be r
(self, data_dir, data_list, input_size, random_scale,
random_mirror, coord)
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