Classical Subgradient Rules
Let be a convex function with domain . A classical subgradient method iterates
where denotes a subgradient of at . If is differentiable, then its only subgradient is the gradient vector itself. It may happen that is not a descent direction for at . We therefore maintain a list that keeps track of the lowest objective function value found so far, i.e.
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[I too am in Arcadia.]”
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Tomb inscription, appearing in classical paintings by Guercino and Poussin, among others. The words probably mean that even the most ideal earthly lives are mortal. Arcadia, a mountainous region in the central Peloponnese, Greece, was the rustic abode of Pan, depicted in literature and art as a land of innocence and ease, and was the title of Sir Philip Sidney’s pastoral romance (1590)
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