# question ###### tags: `Lecture4` 1.不太懂第66頁,q對W微分為什麼會變那樣? 2.不太懂P47.48那裡的max是怎麼運作的? 3.P55的size of the Jacobian matrix為什麼是[4096 x 4096!]? 4.如何把back propagation做向量化?就是其實對於針對這塊還是很矇 https://medium.com/datathings/vectorized-implementation-of-back-propagation-1011884df84
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