Can someone tell me how to derive with respect to $\alpha$ from the following problem enter image description here
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I suspect that $Q$ is linear and $Q^T = Q$ here (i.e. $Q$ a matrix). It seems to me that the answer would involve $b^T \nabla f_k$. – fGDu94 Nov 20 '19 at 02:51
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Yeah, I wonder that there may exist some typos – John Nov 20 '19 at 04:46