very large-scale problem

Alan wrote that this particular problem was' of no great importance, but it is typical of a very large class of non-numerical problems that can be treated by the calculator.

图灵写道，这个问题本身并没有多大意义，但它却是一大类可以用该机器来解决的非数值问题的代表。

On the other hand, the variance of policy gradient estimation in existing policy gradient algorithms is usually large, so the speed of convergence becomes very slow, which is a significant problem for policy gradient algorithms to be widely applied.

但是另一方面，由于在梯度估计过程中方差过大，使得策略梯度算法收敛速度很慢，成为策略梯度增强学习被广泛应用的一个障碍。

Nursing workarounds are a very large problem with BCMA, he emphasized.

护理的解决方法是一个非常大的问题，与BCMA，他强调。

Reload design is directly related to the economy and safety of a Pressurized Water Reactor ( PWR). Because of the large search space and large number of optimization variables, PWR LP search is a very complicated combinatorial problem.

压水堆堆芯换料方案设计关系到核电厂运行的安全性和经济性，但由于优化变量众多搜索空间异常庞大，是一个十分复杂的组合优化问题。