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摘要： Class 2 Gradient DescentFor \[n\times n\] matrix A, B, tr(AB)=trr(BA) tr(ABC)=tr(CAB)=tr(BCA) tr(A)=tr($A^T$)tr():representing the trace of matrix, equal to the sum of diagonal elements of matrixfor \[A\in R^{m*n}, f(A) \in R^1:\]$(\bigtriangledown)_A f(x)=[\frac{\partial f(A)}{\partial A_(ij)}]_... 阅读全文