Repa provides high performance, regular, multi-dimensional, shape polymorphic
 parallel arrays. All numeric data is stored unboxed. Functions written with
 the Repa combinators are automatically parallel provided you supply +RTS -Nn
 on the command line when running the program.
 .
 This package provides a library for the Haskell programming language.
 See http://www.haskell.org/ for more information on Haskell.