Constructor arguments: segmentation: The AbstractSegmentation to load. split: None for no filtering, or 'train' or 'val' etc. randomize: True to randomly shuffle order, or a random seed. categories: a list of categories to include in each batch. batch
(self, segmentation, split=None, randomize=False,
segmentation_shape=None, categories=None, once=False,
start=None, end=None, batch_size=4, ahead=4, thread=False)
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