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文件名称: 模拟退火bi-partitioning
  所属分类: C/C++
  开发工具:
  文件大小: 288kb
  下载次数: 0
  上传时间: 2011-09-19
  提 供 者: bsb****
 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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