Co-authored-by: Ubuntu <ubuntu@ip-172-31-28-63.ap-northeast-1.compute.internal>
Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>
* rrn model and sudoku * add README * refine the code, add doc strings * add sudoku solver * add example for sudoku_solver * ggnn example * Rewrite README file * fix typos