SkePU

"Skeleton programming is an approach where an application is written with the help of "skeletons". A skeleton is a pre-defined, generic component such as map, reduce, scan, farm, pipeline etc. that implements a common specific pattern of computation and data dependence, and that can be customized with (sequential) user-defined code parameters.

Skeletons provide a high degree of abstraction and portability with a quasi-sequential programming interface, as their implementations encapsulate all low-level and platform-specific details such as parallelization, synchronization, communication, memory management, accelerator usage and other optimizations.
 
SkePU is an open-source skeleton programming framework for multicore CPUs and multi-GPU systems.
It is a C++ template library with six data-parallel and one task-parallel skeletons, two generic container types, and support for execution on multi-GPU systems both with CUDA and OpenCL."

https://www.ida.liu.se/labs/pelab/skepu/skepu1/