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基于多评价准则融合的特征选择方法 被引量:2
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作者 于宁宁 刘刚 +1 位作者 刘森 曹冰许 《计算机工程与设计》 北大核心 2018年第7期2075-2079,共5页
为降低特征维数并提高分类准确率,提出一种基于ReliefF算法、互信息和类可分性法的多评价准则融合特征选择方法。利用序关系分析法确定3种评价准则的重要性权值系数,按照多评价准则融合模型获得特征重要性排序,通过支持向量机分类器实... 为降低特征维数并提高分类准确率,提出一种基于ReliefF算法、互信息和类可分性法的多评价准则融合特征选择方法。利用序关系分析法确定3种评价准则的重要性权值系数,按照多评价准则融合模型获得特征重要性排序,通过支持向量机分类器实现最终特征选择。通过3个UCI标准数据集进行仿真实验,实验结果表明,和单准则的特征选择方法相比,该方法在保证良好鲁棒性的基础上,能够有效降低特征维数,具有更高的分类准确率。 展开更多
关键词 特征选择方 多评价准则融合 RELIEFF算 互信息 类可分性法 序关系分析
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Kuhn and Taxonomies of History
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作者 Andrew Gregory 《Journal of Philosophy Study》 2013年第5期412-430,共19页
This paper introduces the idea that if theories of history generate different taxonomies of history they too are incommensurable. I argue this is unavoidable for Kuhn given what he says about incommensurability and 1 ... This paper introduces the idea that if theories of history generate different taxonomies of history they too are incommensurable. I argue this is unavoidable for Kuhn given what he says about incommensurability and 1 investigate the consequences in relation to reflexivity, justification, and paradox for Kuhn's account of science. I want to do this on two levels, firstly looking at different possibilities for characterising individual paradigms. I will look at some examples from ancient and early modem astronomy as here it is clearest that paradigms can be characterised in different ways and that this has important consequences. I will argue in particular that Kuhn's characterisation of the paradigm for astronomy which emerges from antiquity (geocentrism) is favourable to his general account of the history of science, but that there is a very plausible and extremely damaging alternative. I argue that these differing characterisations generate differing, incommensurable taxonomies of the history of astronomy, with attendant "local holism," untranslatability of key terms and issues of theory choice. If so, Kuhn then has problems with generating an adequate decision making protocol for choosing between the two paradigm characterisations. That is problematic in itself, but I also argue this problem is systemic and affects the evidence needed for Kuhn to justify his general account of the history of science. I also want to investigate the implications of differing taxonomies of the history of science at a more abstract level. Kuhn's general theory of the history of science generates a taxonomy of the history of science, as do other theories such as those of Popper and of gradualism. If so, the incommensurability involved here, again with attendant "local holism," untranslatability of key terms and issues of theory choice, leads to issues of paradox and justification for Kuhn's general account of the history of science. With this broader understanding of taxonomic issues, some important Kuhn statements about scientific theories become self-referential, again generating problems of paradox and justification. 展开更多
关键词 Kuhn taxonomy POPPER INCOMMENSURABILITY "local holism theory choice Kuhn Cycle ASTRONOMY
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