ML examples wrap logic in IgniteThread. Why?

[Denis Magda]

Yury, ML folks,

I've mentioned a strange thing. Looks like every example we have wraps up
its logic in the following block

IgniteThread igniteThread = new
IgniteThread(ignite.configuration().getIgniteInstanceName(),
    KMeansClusterizationExample.class.getSimpleName(), () -> {


//ML specific stuff (training, predicting, calculations, etc.)

});

igniteThread.start();
igniteThread.join();


Why do we do that?

Denis