def _shuffle(self, arrays):
        r = np.random.permutation(len(arrays[0]))
        return [ary[r] for ary in arrays]
Tries to take advantage of the fact that we probably queried the parent.
dataset/ETHPy150Open rasbt/mlxtend/mlxtend/classifier/base.py/_BaseClassifier._shuffle--crossover with--dataset/ETHPy150Open memsql/memsql-loader/memsql_loader/vendor/glob2/impl.py/HDFSGlobber._find_in_parent_dir