另外一些常见的学习类型不是被设计用于为输入创建分类，而是作出决定；它们统称决策问题。
The other common type of learning is designed not to create classifications of inputs, but to make decisions; these are called decision problems.
如果通过算法作出的决定需要输入别的地方，这时分类学习是必要的。
Classification learning is often necessary when the decisions made by the algorithm will be required as input somewhere else.
最近的调查显示，作为一项衡量工厂购买原材料以及其他的生产资料的指数，输入价格这个分类指数，下降了。
The latest survey showed that the input prices sub-index, a measure of how much factories pay for raw materials and other intermediary goods, fell.
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