Trying to set up cuda

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I started to program in clojure and I try to set up my cuda on my local machine.

I am trying to run your xor example on my gpu (https://github.com/thinktopic/cortex/blob/master/examples/xor-mlp/project.clj)
but every time I get this: CUDA backend creation failed, reverting to CPU

I tried copying in some more dependencies, but I can't find them neither on maven central, not on clojars.

I tried copying this guy in and others.
[org.bytedeco.javacpp-presets/cuda "8.0-1.2"]

1. Where is the repository of this dependency? Why is it not on clojars or mvn?

2. Does anyone have an easy-to-follow all-in-one newbie-friendly example where I can make sure that at least I installed cuda correctly? I know I am derping around with these dependencies, but it is my way to do it. In the perfect world all examples with cuda 9.1 and nvidia-390 driver would already exist.

Also it would be nice to see the main cause of the "Fallback to CPU" message.