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(Machine Learning Foundations)—Mathematical Foundations
,副教授 (Associate Professor),资讯工程学系 (Computer Science and Information Engineering)
Matrix Form of Ein(w) E i n ( w )
find wLIN w L I N such that ∇Ein(wLIN)=0 ∇ E i n ( w L I N ) = 0
伪逆矩阵 pseudo-inverse
矩阵的平方展开、求导,抓住一个或一行的例子,纵观计算过程,推倒式子
hat matrix H=XX† H = X X † , y^=Hy y ^ = H y
Geometric View of Hat Matrix
H H 将 投影到 y^ y ^
The Learning Curve
(平均情况)