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# Source code for mmseg.datasets.chase_db1

    import os.path as osp

    from .builder import DATASETS
    from .custom import CustomDataset

    @DATASETS.register_module()
    class ChaseDB1Dataset(CustomDataset):
        """Chase_db1 dataset.

        In segmentation map annotation for Chase_db1, 0 stands for background,
        which is included in 2 categories. ``reduce_zero_label`` is fixed to False.
        The ``img_suffix`` is fixed to '.png' and ``seg_map_suffix`` is fixed to
        '_1stHO.png'.
        """

        CLASSES = ('background', 'vessel')

        PALETTE = [[120, 120, 120], [6, 230, 230]]

        def __init__(self, **kwargs):
            super(ChaseDB1Dataset, self).__init__(
                img_suffix='.png',
                seg_map_suffix='_1stHO.png',
                reduce_zero_label=False,
                **kwargs)
            assert osp.exists(self.img_dir)