نتایج جستجو برای: ensemble

تعداد نتایج: 43161  

2012
Lena Tenenboim-Chekina Lior Rokach Bracha Shapira

A number of ensemble algorithms for solving multi-label classification problems have been proposed in recent years. Diversity among the base learners is known to be important for constructing a good ensemble. In this paper we define a method for introducing diversity among the base learners of one of the previously presented multi-label ensemble classifiers. An empirical comparison on 10 datase...

In this paper, first, an initial feature vector for vocal fold pathology diagnosis is proposed. Then, for optimizing the initial feature vector, a genetic algorithm is proposed. Some experiments are carried out for evaluating and comparing the classification accuracies which are obtained by the use of the different classifiers (ensemble of decision tree, discriminant analysis and K-nearest neig...

Mohammad R. N. Avanaki Mohammad R. Pishgoo Reza Ebrahimpour

Optical Coherence Tomography (OCT) uses the spatial and temporal coherence properties of optical waves backscattered from a tissue sample to form an image. An inherent characteristic of coherent imaging is the presence of speckle noise. In this study we use a new ensemble framework which is a combination of several Multi-Layer Perceptron (MLP) neural networks to denoise OCT images. The noise is...

ژورنال: :پژوهش های حسابداری مالی و حسابرسی 0
محمد حسین ستایش استاد حسابداری، دانشگاه شیراز، شیراز، ایران مصطفی کاظم نژاد دانشجوی دکتری حسابداری، دانشگاه شیراز، شیراز، ایران

مقاله حاضر به بررسی سودمندی رگرسیون های تجمیعی و روش های انتخاب متغیرهای پیش بین بهینه (شامل روش مبتنی بر همبستگی و ریلیف) برای پیش بینی بازده سهام شرکت های پذیرفته شده در بورس اوراق بهادار تهران می پردازد. به منظور ارزیابی عملکرد رگرسیون تجمیعی، معیارهای ارزیابی (شامل میانگین قدرمطلق درصد خطا، مجذور مربع میانگین خطا و ضریب تعیین) مربوط به پیش بینی این روش، با رگرسیون خطی و شبکه های عصبی مصنوعی...

Journal: :IJPRAI 2011
Sandro Vega-Pons José Ruiz-Shulcloper

Cluster ensemble has proved to be a good alternative when facing cluster analysis problems. It consists of generating a set of clusterings from the same dataset and combining them into a ̄nal clustering. The goal of this combination process is to improve the quality of individual data clusterings. Due to the increasing appearance of new methods, their promising results and the great number of ap...

2006
Ricardo Ñanculef Carlos Valle Héctor Allende Claudio Moraga

The concept of Diversity is now recognized as a key characteristic of successful ensembles of predictors. In this paper we investigate an algorithm to generate diversity locally in regression ensembles of neural networks, which is based on the idea of imposing a neighborhood relation over the set of learners. In this algorithm each predictor iteratively improves its state considering only infor...

Journal: :CoRR 2017
Bruno Schneider Dominik Jäckle Florian Stoffel Alexandra Diehl Johannes Fuchs Daniel A. Keim

Ensembles of classifier models typically deliver superior performance and can outperform single classifier models given a dataset and classification task at hand. However, the gain in performance comes together with the lack in comprehensibility, posing a challenge to understand how each model affects the classification outputs and where the errors come from. We propose a tight visual integrati...

Journal: :Soft Comput. 2008
Marek Reformat Ronald R. Yager

A pervasive task in many forms of human activity is classification. Recent interest in the classification process has focused on ensemble classifier systems. These types of systems are based on a paradigm of combining the outputs of a number of individual classifiers. In this paper we propose a new approach for obtaining the final output of ensemble classifiers. The method presented here uses t...

2010
Zhi-Hua Zhou Nan Li

Understanding ensemble diversity is one of the most important fundamental issues in ensemble learning. Inspired by a recent work trying to explain ensemble diversity from the information theoretic perspective, in this paper we study the ensemble diversity from the view of multi-information. We show that from this view, the ensemble diversity can be decomposed over the component classifiers cons...

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