For an MDP (S, A, T, R,y), let Vo: SR be an initial guess of the...
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For an MDP (S, A, T, R,y), let Vo: SR be an initial guess of the optimal value function V*. Suppose that this guess is progressively updated using Value Iteration: that is, by setting Vt+1+B* (Vt) for t = 0, 1, 2,.... Recall that B* is the Bellman optimality operator. In this question, we examine the design of a stopping condition for Value Iteration. As usual, let ||-|| denote the max norm. We would like that our computed solution, V for some u € {1,2,...}, be within e of V* for some given tolerance > 0. In other words, we would like to stop after u applications of B*, so long as we can guarantee ||Vu-V*|| ≤e. Naturally, we cannot use V* itself in our stopping rule, since it is not known! Show that it suffices to stop when €(1-7) Vu-Vu-1||0 ≤ Y and thereafter return V as the answer. You are likely to find two results handy: (1) that B* is a contraction mapping with contraction factory, and (2) the triangle inequality: for X: SR,Y: SR, || X + Y||∞ ≤ ||X||∞ + ||Y||∞o. For an MDP (S, A, T, R,y), let Vo: SR be an initial guess of the optimal value function V*. Suppose that this guess is progressively updated using Value Iteration: that is, by setting Vt+1+B* (Vt) for t = 0, 1, 2,.... Recall that B* is the Bellman optimality operator. In this question, we examine the design of a stopping condition for Value Iteration. As usual, let ||-|| denote the max norm. We would like that our computed solution, V for some u € {1,2,...}, be within e of V* for some given tolerance > 0. In other words, we would like to stop after u applications of B*, so long as we can guarantee ||Vu-V*|| ≤e. Naturally, we cannot use V* itself in our stopping rule, since it is not known! Show that it suffices to stop when €(1-7) Vu-Vu-1||0 ≤ Y and thereafter return V as the answer. You are likely to find two results handy: (1) that B* is a contraction mapping with contraction factory, and (2) the triangle inequality: for X: SR,Y: SR, || X + Y||∞ ≤ ||X||∞ + ||Y||∞o.
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