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arXiv 1305.1002cs.LGstat.ML
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概率K近邻分类中近邻数的有效估计

Efficient Estimation of the number of neighbours in Probabilistic K Nearest Neighbour Classification

School of Mathematical Sciences, University College Dublin, Ireland(爱尔兰都柏林大学数学科学学院)

Ji Won Yoon, Nial Friel

摘要:

概率最近邻(PKNN)分类已被引入,以提高性能的原始k-最近邻(KNN)分类算法,明确建模的不确定性,在每个特征向量的分类。然而,KNN和PKNN的共同问题是选择最佳的邻居数$k$。本文的贡献是将$k$中的不确定性纳入决策中,并在这样做时使用贝叶斯模型平均来提供改进的分类。实际上,评估$k$中的不确定性的问题可以被视为统计模型选择的问题之一,这是统计和机器学习领域中最重要的技术问题之一。在本文中,一个新的功能近似算法,提出了重建密度的模型(阶),而不依赖于耗时的蒙特卡罗模拟。此外,该算法采用贝叶斯框架,避免了交叉验证。该算法的性能在几个真实的实验数据集上取得了非常好的性能。

英文摘要:

Probabilistic k-nearest neighbour (PKNN) classification has been introduced to improve the performance of original k-nearest neighbour (KNN) classification algorithm by explicitly modelling uncertainty in the classification of each feature vector. However, an issue common to both KNN and PKNN is to select the optimal number of neighbours, $k$. The contribution of this paper is to incorporate the uncertainty in $k$ into the decision making, and in so doing use Bayesian model averaging to provide improved classification. Indeed the problem of assessing the uncertainty in $k$ can be viewed as one of statistical model selection which is one of the most important technical issues in the statistics and machine learning domain. In this paper, a new functional approximation algorithm is proposed to reconstruct the density of the model (order) without relying on time consuming Monte Carlo simulations. In addition, this algorithm avoids cross validation by adopting Bayesian framework. The performance of this algorithm yielded very good performance on several real experimental datasets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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