愤怒的可乐2021-12-19 15:46:54.0
有 ∂ L ∂ x = ∂ L ∂ y ∂ y ∂ x = ∂ L ∂ y W T \frac{\partial L}{\partial x}= \frac{\partial L}{\partial y} \frac{\partial y}{\partial x} = \frac{\partial L}{\partial y} W^T ∂x∂L=∂y∂L∂x∂y=∂y∂LWT x x x的形状是 1 × D 1 \times D 1×D;∂ z ∂ y = − x y 2 \frac{\partial z}{\partial x} = \frac{1}{y};有 ∂ y ∂ x = [ ∂ y 1 ∂ x 1 ∂ y 1 ∂ x 2 ⋯ ∂ y 1 ∂ x D ∂ y 2 ∂ x 1 ∂ y 2 ∂ x 2 ⋯ ∂ y 2 ∂ x D ⋮ ⋮ ⋱ ⋮ ∂ y H ∂ x 1 ∂ y H ∂ x 2 ⋯ ∂ y H ∂ x D ] \frac{\partial y}{\partial x}= \begin{bmatrix} \frac{\partial y_1}{\partia