def __repr__(self):
        return thread_first(self, iteritems, list, repr)
Creates dataset (pair of X and y) from Cohn-Kanade
dataset/ETHPy150Open duerrp/pyexperiment/pyexperiment/utils/HierarchicalMapping.py/HierarchicalMapping.__repr__--crossover with--dataset/ETHPy150Open dfdx/masque/masque/datasets.py/_cohn_kanade_orig