文件名称:
模拟退火bi-partitioning
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文件大小: 288kb
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上传时间: 2011-09-19
详细说明： Simulated Annealing • Idea originated from observations of crystal formations (e.g., in lava) A crystal is in a low energy state Materials tend to form crystals (global minimum) If at the right temperature (i.e., right speed), a molecule will adhere to a crystal formation • VV l l d t t ery slowly decrease temperature When very hot, molecules move freely o When a molecule gets to a chunk of crystal, it *might* move away due to its high speed When colder, molecules slow down o The probability of moving away from a l ocal optimum decreases When the material “freezes”, all molecules are fixed and the material is in minimum energy state Simulated Annealing Algorithm • Components: Solution space (e.g., slicing floorplans) Cost function (e.g., the area of a floorplan) o Determines how “good” a particular solution is Perturbation rules ( g , g p ) (e.g., transforming a floorplan to a new one) Simulated annealing engine o A variable T, analogous to temperature o An initial temperature T 0 (e.g., T 0 = 40,000) o A freezing temperature T freez (e.g., T freez =0.1) o A cooling schedule (e.g., T = 0.95 * T) ...展开收缩
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