There are Java and C# compilers for CUDA such as JCUDA and http://www.altimesh.com/hybridizer-essentials/ http://www.altimesh.com/hybridizer-essentials/ but the

There are Java and C# compilers for CUDA such as JCUDA and http://www.altimesh.com/hybridizer-essentials/ http://www.altimesh.com/hybridizer-essentials/ but the CUDA runtime, libraries and the first party compiler only supports C/C++ and FORTRAN, for Python you need to use something like Numba. Most non C++ frameworks and implementations tho would simply use wrappers and bindings. I also am not aware of any high performance lib for CUDA that wasn’t written in C++.