def open_file(self, path):
        self.h5file = tables.open_file(path, mode="r")
        node = self.h5file.get_node('/', self.data_node)

        self.nodes = [getattr(node, source) for source in self.sources_in_file]
        if self.stop is None:
            self.stop = self.nodes[0].nrows
        self.num_examples = self.start - self.stop
dataset/ETHPy150Open mila-udem/fuel/fuel/datasets/hdf5.py/PytablesDataset.open_file/swapped operands of `-`