This is a large nonlinear integer programming problem.

这是一个变量数目很大的非线性整数规划问题。

It is to understand the basis for other integer programming problem.

它是理解其它整数规划问题的基础。

The process of which is to solve the integer programming problem with the objective function that RMSE is minimal.

选择最优参数的过程即是对以均方根误差最小为目标的整数规划问题的求解过程。