1.1 $$E{o t e}\left(\mathfrak{L}{a} | X, f\right)=\sum{h} \sum{\boldsymbol{x} \in \mathcal{X}-X} P(\boldsymbol{x}) \mathbb{I}(h(\boldsymbol{x}) \neq f(\boldsymbol{x})) P\left(h | X, \mathfrak{L}{a}\right)$$ [解析]：参见公式(1.2) 1.