multithreading

Problem

Mar 20 11:01:51.320  INFO building yew-app
   Compiling yew-app v0.1.0 (/home/llfourn/src/yew-app)
error[E0425]: cannot find function `start_app` in crate `yew`
  --> src/main.rs:11:10
   |
11 |     yew::start_app::<App>();
   |          ^^^^^^^^^ not found in `yew`

For more information about this error, try `rustc --explain E0425`.
error: could not compile `yew-app` 

FEATURE REQUEST:

In CannyLab/tsne-cuda#8, the possibility of using a custom NN matrix is discussed and noted to be 'easy' to implement.
DavidMChan: " It would be easy to add the ability to pass in a sparse nearest neighbors matrix, however it becomes more complicated if you want to extract the nearest neighbors from a pre-computed distance matrix."

It would be a s