Method sort2

ot/backend.py:1447–1448

(self, a, axis=-1)

        return np.prod(a, axis=axis)

    def sort2(self, a, axis=-1):
        return self.sort(a, axis), self.argsort(a, axis)

    def qr(self, a):
        np_version = tuple([int(k) for k in np.__version__.split(".")])