Closed-Form Solution
P.S. 讲了这么多，其实 closed-form expression 就是 “解析解”，analytic expression。这两者其实有微妙的差别，但大体上你理解成是同一事物是 OK 的。而且你还能见到 “analytic closed-form solution” 这种表达方式，真的不需要 care 太...
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Hypothesis Space / Underfitting / Overfitting / Bias / Variance
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$$ \newcommand{\icol}[1]{ \bigl[ \begin{smallmatrix} #1 \end{smallmatrix} \bigr] }
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