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- 2003-8-13
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- 1970-1-1
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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?
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.
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:
Internal:
Displays the evaluation scheme used by the technique
(0 - Evaluation, 1- Gradient, 2 - Search, 3 - Initialize).
类似的,其他字段还有如下(更多信息,请查看iSIGHT user guide的 Solution Monitor--> Using Database Files --> Filtering Data by Rows):
Feasibility:
Records whether the design satisfies its constraints and how it compares to previous designs. There are ten possible values, 0-9. For more
information on the meaning of these values, refer to the iSIGHT Reference Guide.
Control:
Provides information on the iterative control mode that is being used
(1 - Single, 2 - Optimize, 3 - DOE, 4 - Approximation, 5 - TaskPlan).
Approach:
Shows whether an optimization run is deterministic or probabilistic
(0 - Deterministic, 1 - Probabilistic).
A deterministic optimization is a standard optimization. A probabilistic optimization includes random variables and reliability analysis.
Analysis:
Displays the type of analysis for the recorded design point. The following options are available:
0 - Task run without approximations (Exact analysis).
1 - Task run with approximations (Approximate analysis).
2 - Design restored from database using Exact match.
3 - Design restored from database using inexact match (Significant Digits match or Relative Delta match).
The following values are used for Mixed Integer Optimization (MOST) only. Since MOST treats all INTEGER and DISCRETE design variables as REAL parameters
during initial phases of optimization, such parameters can assume values that are outside of the original design space. Therefore, design points with such violations
must be marked with different Analysis codes and cannot be used for Best Solution or in future database lookups.
4 - Task run without approximations (Exact analysis), outside of the original
design space.
5 - Task run with approximations (Approximate analysis), outside of the original design space.
6 - Design restored from database using Exact match, outside of the original design space.
7 - Design restored from database using inexact match (Significant Digits match or Relative Delta match), outside of the original design space.
Technique:
Displays the plan named being used during design exploration. Technique Data. Displays information pertaining to the design exploration
technique. |
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