ruilialice

> > For the second question, the paper states that projection is needed to constrain embeddings and tangent vectors to remain on the manifold and tangent spaces. > > But...

Hi, you could read the paper [here](https://arxiv.org/pdf/1806.03417.pdf). Formula (6) in this paper says that if x has (n+1) dimension, and x is in hyperboloid manifold, then x has the constraint...