AN EMPIRICAL STUDY OF DIFFERENT BRANCHING STRATEGIES FOR CONSTRAINT SATISFACTION PROBLEMS
Park, Vincent Se-jin
MetadataShow full item record
Many real life problems can be formulated as constraint satisfaction problems <i>(CSPs)</i>. Backtracking search algorithms are usually employed to solve <i>CSPs</i> and in backtracking search the choice of branching strategies can be critical since they specify how a search algorithm can instantiate a variable and how a problem can be reduced into subproblems; that is, they define a search tree. In spite of the apparent importance of the branching strategy, there have been only a few empirical studies about different branching strategies and they all have been tested exclusively for numerical constraints. In this thesis, we employ the three most commonly used branching strategies in solving finite domain <i>CSPs</i>. These branching strategies are described as follows: first, a branching strategy with strong commitment assigns its variables in the early stage of the search as in k-Way branching; second, 2-Way branching guides a search by branching one side with assigning a variable and the other with eliminating the assigned value; third, the domain splitting strategy, based on the least commitment principle, branches by dividing a variable's domain rather than by assigning a single value to a variable. In our experiments, we compared the efficiency of different branching strategies in terms of their execution times and the number of choice points in solving finite domain <i>CSPs</i>. Interestingly, our experiments provide evidence that the choice of branching strategy for finite domain problems does not matter much in most cases--provided we are using an effective variable ordering heuristic--as domain splitting and 2-Way branching end up simulating k-Way branching. However, for an optimization problem with large domain size, the branching strategy with the least commitment principle can be more efficient than the other strategies. This empirical study will hopefully interest other practitioners to take different branching schemes into consideration in designing heuristics.
Cite this work
Vincent Se-jin Park (2004). AN EMPIRICAL STUDY OF DIFFERENT BRANCHING STRATEGIES FOR CONSTRAINT SATISFACTION PROBLEMS. UWSpace. http://hdl.handle.net/10012/1193
Showing items related by title, author, creator and subject.
Munam, Abdul (University of Waterloo, 2007-09-28)The research presented focused on the synthesis and the characterization of graft polymers, of interest either as model systems or for large-scale applications. The materials selected as substrates for grafting reactions ...
Joeris, Benson (University of Waterloo, 2015-05-06)The results in this thesis are steps toward bridging the gap between the handful of exact structure theorems known for minor-closed classes of graphs, and the very general, yet wildly qualitative, Graph Minors Structure ...
Rheological Modification of Polypropylene by Incorporation of Long Chain Branches Using UV Radiation Amintwolieh, Yasaman (University of Waterloo, 2014-11-21)Modification of polypropylene (PP) is important as it aims at changing the molecular structure of PP and synthesizing different grades of PP for different processing applications. These changes include narrowing of the ...