The two classes are linearly separable. 这两类数据是线性可分的。
If the data were linearly separable, a single hyperplane could classify all points correctly, but in practice we often need a nonlinear model or feature mapping. 如果数据是线性可分的,那么一个超平面就能把所有点正确分类;但在实际中我们往往需要非线性模型或特征映射。