hyacinth 发表于 2005-9-29 09:48

[转帖]通过isight的结果数据库,有效研究优化的历程

isight的算法很多,对不熟悉算法的人来讲就似乎是个黑盒子,觉得很神秘。那么,如何知道算法每步在干什么工作呢?<BR>下面推荐一个方法,即:通过isight的db文件数据库的后处理来研究算法的历程.<BR><BR>比如:梯度算法在计算过程中,通常要进行评价、敏度分析、线搜索等操作,你可以把db数据库打开,然后看到"Internal"这一列的值即可知道isight在这一步在作什么工作:<BR><BR>Internal: <BR>Displays the evaluation scheme used by the technique <BR>(0 - Evaluation, 1- Gradient, 2 - Search, 3 - Initialize).<BR><BR>类似的,其他字段还有如下(更多信息,请查看iSIGHT user guide的 Solution Monitor--&gt; Using Database Files --&gt; Filtering Data by Rows):<BR><BR>Feasibility:<BR><BR>Records whether the design satisfies its constraints and how it compares to previous designs. There are ten possible values, 0-9. For more<BR>information on the meaning of these values, refer to the iSIGHT Reference Guide.<BR><BR>Control:<BR>Provides information on the iterative control mode that is being used <BR>(1 - Single, 2 - Optimize, 3 - DOE, 4 - Approximation, 5 - TaskPlan).<BR><BR>Approach:<BR>Shows whether an optimization run is deterministic or probabilistic<BR>(0 - Deterministic, 1 - Probabilistic). <BR>A deterministic optimization is a standard optimization. A probabilistic optimization includes random variables and reliability analysis.<BR><BR>Analysis:<BR>Displays the type of analysis for the recorded design point. The following options are available:<BR><BR>0 - Task run without approximations (Exact analysis).<BR>1 - Task run with approximations (Approximate analysis).<BR>2 - Design restored from database using Exact match.<BR>3 - Design restored from database using inexact match (Significant Digits match or Relative Delta match).<BR><BR>The following values are used for Mixed Integer Optimization (MOST) only. Since MOST treats all INTEGER and DISCRETE design variables as REAL parameters<BR>during initial phases of optimization, such parameters can assume values that are outside of the original design space. Therefore, design points with such violations<BR>must be marked with different Analysis codes and cannot be used for Best Solution or in future database lookups.<BR>4 - Task run without approximations (Exact analysis), outside of the original<BR>design space.<BR>5 - Task run with approximations (Approximate analysis), outside of the original design space.<BR>6 - Design restored from database using Exact match, outside of the original design space.<BR>7 - Design restored from database using inexact match (Significant Digits match or Relative Delta match), outside of the original design space.<BR><BR><BR>Technique:<BR>Displays the plan named being used during design exploration. Technique Data. Displays information pertaining to the design exploration<BR>technique. <BR>
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