Product Manifold should have different curvatures for different component manifolds.

[karish-grover]

In the productManifold class, it seems that the same curvature value is being passed for all manifolds. Consider the below piece of code from the expmap(self, u, p, c) function. The same curvature c is being passed for expmap to all sub-manifolds. This seems wrong. Shouldn't we pass the corresponding curvatures for every manifold?

        for i, manifold in enumerate(self.manifolds):
            point = self.take_submanifold_value(p, i)
            tangent = self.take_submanifold_value(u, i)
            mapped = manifold.expmap(tangent, point,c)

All the sub-manifolds cannot technically have the same curvatures since some might be positive (spherical) and some negative (hyperbolic).