Add working GPU implementation#2

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Micki-D wants to merge 3 commits into

Micki-D:splines-gpufrom

LolianSh:splines-cs-dev

Commits on Oct 28, 2022

Working GPU implementation
LolianSh
committed

Commits on Nov 2, 2022

Added example of annealed training of normalizing flow
LolianSh
committed

Commits on Nov 21, 2022

Some changes
Michael Dudkowiak
committed