Kangaroo: An Efficient Constraint-Based Local Search System Using Lazy Propagation. In this paper, we introduce Kangaroo, a constraint-based local search system. While existing systems such as Comet maintain invariants after every move, Kangaroo adopts a lazy strategy, updating invariants only when they are needed. Our empirical evaluation shows that Kangaroo consistently has a smaller memory footprint than Comet, and is usually significantly faster.

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  1. Björdal, Gustav; Monette, Jean-Noël; Flener, Pierre; Pearson, Justin: A constraint-based local search backend for MiniZinc (2015)