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update rst to remove problematic whitespace for conversion using tomyst (#146)
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source/rst/robustness.rst

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@@ -100,9 +100,9 @@ Here
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* *Entropy* is a non-negative number that measures the size of a set of models surrounding the decision-maker's approximating model.
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* Entropy is zero when the set includes only the approximating model, indicating that the decision-maker completely trusts the approximating model.
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* Entropy is zero when the set includes only the approximating model, indicating that the decision-maker completely trusts the approximating model.
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* Entropy is bigger, and the set of surrounding models is bigger, the less the decision-maker trusts the approximating model.
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* Entropy is bigger, and the set of surrounding models is bigger, the less the decision-maker trusts the approximating model.
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The shaded region indicates that for **all** models having entropy less than or equal to the number on the horizontal axis, the value obtained will be somewhere within the indicated set of values.
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Here is a hint about the *secret weapons* we'll use to construct these sets
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* We'll use some min problems to construct the lower bounds
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* We'll use some min problems to construct the lower bounds
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* We'll use some max problems to construct the upper bounds
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* We'll use some max problems to construct the upper bounds
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We will also describe how to choose :math:`F` to shape the sets of values.
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To construct the *lower bound* on the set of values associated with all perturbations :math:`{\mathbf w}` satisfying the entropy constraint :eq:`rb_dec` at a given entropy level, we proceed as follows:
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* For a given :math:`\theta`, solve the minimization problem :eq:`rb_a2o`.
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* For a given :math:`\theta`, solve the minimization problem :eq:`rb_a2o`.
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* Compute the minimizer :math:`R_\theta(x_0, F)` and the associated entropy using :eq:`rb_pdt22`.
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* Compute the minimizer :math:`R_\theta(x_0, F)` and the associated entropy using :eq:`rb_pdt22`.
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* Compute the lower bound on the value function :math:`R_\theta(x_0, F) - \theta \ {\rm ent}` and plot it against :math:`{\rm ent}`.
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* Compute the lower bound on the value function :math:`R_\theta(x_0, F) - \theta \ {\rm ent}` and plot it against :math:`{\rm ent}`.
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* Repeat the preceding three steps for a range of values of :math:`\theta` to trace out the lower bound.
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* Repeat the preceding three steps for a range of values of :math:`\theta` to trace out the lower bound.
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.. note::
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This procedure sweeps out a set of separating hyperplanes indexed by different values for the Lagrange multiplier :math:`\theta`.
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The Upper Bound
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To construct the *upper bound* on the set of values associated all perturbations :math:`{\mathbf w}` with a given entropy we proceed much as we did for the lower bound
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* For a given :math:`\tilde \theta`, solve the maximization problem :eq:`rba2omax`.
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* For a given :math:`\tilde \theta`, solve the maximization problem :eq:`rba2omax`.
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* Compute the maximizer :math:`V_{\tilde \theta}(x_0, F)` and the associated entropy using :eq:`rbpdt223`.
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* Compute the maximizer :math:`V_{\tilde \theta}(x_0, F)` and the associated entropy using :eq:`rbpdt223`.
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* Compute the upper bound on the value function :math:`V_{\tilde \theta}(x_0, F) + \tilde \theta \ {\rm ent}` and plot it against :math:`{\rm ent}`.
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* Compute the upper bound on the value function :math:`V_{\tilde \theta}(x_0, F) + \tilde \theta \ {\rm ent}` and plot it against :math:`{\rm ent}`.
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* Repeat the preceding three steps for a range of values of :math:`\tilde \theta` to trace out the upper bound.
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* Repeat the preceding three steps for a range of values of :math:`\tilde \theta` to trace out the upper bound.
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Reshaping the Set of Values
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* ``robust_rule()`` and ``robust_rule_simple()`` both solve for the
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triple :math:`\hat F, \hat K, \hat P`, as described in equations :eq:`rb_oc_ih` -- :eq:`rb_kd` and the surrounding discussion
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* ``robust_rule()`` is more efficient
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* ``robust_rule()`` is more efficient
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* ``robust_rule_simple()`` is more transparent and easier to follow
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* ``robust_rule_simple()`` is more transparent and easier to follow
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* ``K_to_F()`` and ``F_to_K()`` solve the decision problems
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of :ref:`agent 1 <rb_a1>` and :ref:`agent 2 <rb_a2>` respectively

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