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Bilevel optimization
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<p>Bilevel optimization is a special kind of <a href="/facts/Optimization/oRn8Iv5I">optimization</a> where one problem is embedded (nested) within another. The outer optimization task is commonly referred to as the upper-level optimization task, and the inner optimization task is commonly referred to as the lower-level optimization task. These problems involve two kinds of variables, referred to as the upper-level variables and the lower-level variables. </p>