# U

**Uncertainty（不确定性）**

可能包含真实值的一系列值。

**Underfitting（拟合不足）**

机器学习算法无法正确捕获数据的底层结构，通常是因为模型不够高级或不适用于当前任务；与过度拟合的涵义相反。

**Unsupervised Learning（无监督学习）**

机器学习的领域之一，包括对用于描述未标记数据结构的函数进行推断。


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