Ruby is far behind than other languages such as Python in scientific computing. One reason is because there is no fast numerical library in Ruby.

I have made a high speed numerical library for Ruby using CUDA named "Cumo". In this talk, I describe:

• Overview of Scientific Computing in Ruby
• Basic knowledge of GPU programming
• Cumo inside, such as
  • Writing fast CUDA kernel
  • Implementing GPU memory pool
  • JIT compiling user-defined kernel
• Performance comparison with Numo in an emerging DNN framework written in Ruby, red-chainer