Transform with new data?

[stallam-unb]

Semi-related to #4 , but my case is that I want to use HUMAP on a supervised data where I have a training data with labels, and I want to be able to project new test data with the same embeddings. UMAP supports this use case, I was wondering if this would be theoretically possible with HUMAP as well? Would be nice to be able to use HUMAP to interpret classifier decisions.