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不确定空间上基于复样本的统计学习理论基础
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摘要
统计学习理论是处理小样本学习问题的重要理论,但该理论是建立在概率空间上基于实随机样本的,它难以处理现实世界中客观存在的非概率空间上基于非实随机样本的小样本统计学习问题。不确定空间是比概率空间更广的空间,本文讨论了不确定空间上基于复样本的统计学习理论。首先,给出了复不确定变量及其分布函数、期望和方差的概念,证明了不确定空间上基于复样本的Markov不等式、Chebyshev不等式和Khintchine大数定律;其次,引入了不确定空间上基于复样本的复经验风险泛函、复期望风险泛函、复经验风险最小化原则以及复严格一致收敛的定义,证明了不确定空间上基于复样本的学习理论的关键定理;最后,讨论了不确定空间上基于复样本的学习过程一致收敛速度的界。
Statistical Learning Theory (SLT) is one of the most important theories to deal with small samples. However, the theory is built on probability space and based on real random samples, so it can hardly handle statistical learning problems built on non-probability space and based on non-real random samples in real world. Uncertainty space is wider than probability space. In this dissertation, SLT built on uncertainty space and based on complex random samples is discussed. Firstly, the definitions of complex uncertain variable together with its distribution function, expected value, and variance are presented. Then Markov inequality, Chebyshev inequality and Khintchine law of large numbers built on uncertainty space and based on complex samples are also proved. Secondly, some new concepts, such as complex empirical risk functional, complex expected risk functional, and strict consistency of the complex empirical risk minimization principle built on uncertainty space and based on complex samples, are introduced. The key theorem of learning theory built on uncertainty space and based on complex samples is proved. At last, the bounds on the rate of convergence of learning process built on uncertainty space and based on complex random samples are given.
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