How can i run with the product of manifolds

[nguyentuc]

Hi teams, thank you for the quick support.
I am trying to run these models with the product of manifolds. For example, with HGCN, in the config.py, I used manifold with Product(Euclidean(), Stereographic()).
But it seems doesn't work and has a bug.
Did I do any wrong?
Thank you so much.