Gradient && Hessian The gradient of a f, d x 1, can be represented as follow f(x)=[f(x)x1f(x)xd] and the Hessian, d x d, can be represented as 2f(x)=[2f(x)x212f(x)x1x22f(x)x1xd2f(x)x2d2f(x)xdx22f(x)xdxd]……

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