Not sure what they cover, but there are surely libraries available,

https://deeplearning4j.org/

https://github.com/originrose/cortex

http://www.onyxplatform.org/

https://neanderthal.uncomplicate.org/

https://clojurecuda.uncomplicate.org/

https://clojurecl.uncomplicate.org/

https://github.com/uncomplicate/bayadera

https://devblogs.nvidia.com/grcuda-a-polyglot-language-bindi...

Also since Pytorch 1.4 there is initial support for Java, built on top of the new pure C++ API.