Do you any any good tutorials or online trainings on programming in CUDA ?
The books: “CUDA by example” and “Programming Massively Parallel Processors: A Hands-on Approach”
A good course http://courses.engr.illinois.edu/ece498/al/
If you look on ggole cuda totorials there are many toturials, but I suggest to look only over the ones from 2011.
And of course there is the definitive text about CUDA programming, the CUDA C Programming Guide.