def get_paths(self, dset=['train', 'valid', 'test']):
        outs = []
        for name in dset:
            out = []
            for item in self.f['paths_'+name]:
                out.append(self.tolist(item))
            outs.append(out)

        return outs
Return the paths (as a list of articles' ids) to reach the query,
dataset/ETHPy150Open nyu-dl/WebNav/qp.py/QP.get_paths