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In the gradient descent algorithm, >0 is the learning rate. If is small enough, then the function value guarantees to decrease. In practice, we may

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In the gradient descent algorithm, >0 is the learning rate. If is small enough, then the function value guarantees to decrease. In practice, we may anneal , meaning that we star from a relatively large , but decrease it gradually. Show that cannot be decreased too fast. If is decreased too fast, even if it is strictly positive, the gradient descent algorithm may not converge to the optimum of a convex function. Hint: Show a concrete loss and an annealing scheduler such that the gradient descent algorithm fails to converge to the optimum

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