t-SNE errors when running sake with more than 1 cpu core

[psterk]

If I use more than 1 CPU core, sake fails to produce t-SNE plots with the following error:

Library Rtsne loaded.
Library Rtsne loaded in cluster.

Timing stopped at: 2.894 0.368 7.259
Error in checkForRemoteErrors(val) : 
  2 nodes produced errors; first error: Operation not allowed without an active reactive context. (You tried to do something that can only be done from inside a reactive expression or observer.)

This happens on MacOS (Catalina) and on Ubuntu 18.04, both running R 3.6.1, shiny 1.4.0, Rtsne 0.15. NMF runs happily with multiple CPUs. I'm not sure whether this can be fixed easily, but I can live with just using one CPU core when I want to generate t-SNE plots.

[naikai]

I'll take a look and get back to you. Thanks for reporting it.

[naikai]

Hi @psterk ,

Sorry for the late reply. This is the message I got when I run t-SNE using 16 cores.
Can you tell me which back end you are using for running parallel jobs?
Thanks.

---

Library Rtsne loaded.
Library Rtsne loaded in cluster.


Stopping cluster

snowfall 1.84-6.1 initialized (using snow 0.4-3): parallel execution on 16 CPUs.

Library Rtsne loaded.
Library Rtsne loaded in cluster.


Stopping cluster