特征选择( Feature Selection )也称特征子集选择( Feature Subset Selection , FSS ),或属性选择( Attribute Selection )。是指从已有的M个特征(Feature)中选择N个特征使得系统的特定指标最优化,是从原始特征中选择出一些最有效特征以降低数据集维度的过程,是提高学习算法性能的一个重要手段,也是模式识别中关键的数据预处理步骤。对于一个学习算法来说,好的学习样本是训练模型的关键。

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简介: 迁移学习作为机器学习的一大分支,已经取得了长足的进步。本手册简明地介绍迁移学习的概念与基本方法,并对其中的领域自适应问题中的若干代表性方法进行讲述。最后简要探讨迁移学习未来可能的方向。 本手册编写的目的是帮助迁移学习领域的初学者快速入门并掌握基本方法,为自己的研究和应用工作打下良好基础。 本手册的编写逻辑很简单:是什么——介绍迁移学习;为什么——为什么要用迁移学习、为什么能用;怎么办——如何进行迁移 (迁移学习方法)。其中,是什么和为什么解决概念问题,这是一切的前提;怎么办是我们的重点,也占据了最多的篇幅。为了最大限度地方便初学者,我们还特别编写了一章上手实践,直接分享实现代码和心得体会。

作者简介: 王晋东,现于中国科学院计算技术研究所攻读博士学位,研究方向为迁移学习、机器学习等。他在国际权威会议ICDM、UbiComp等发表多篇文章。同时,也是知乎等知识共享社区的机器学习达人(知乎用户名:王晋东不在家)。他还在Github上发起建立了多个与机器学习相关的资源仓库,成立了超过120个高校和研究所参与的机器学习群,热心于知识的共享。个人主页:http://jd92.wang

目录:

  • 迁移学习基本概念
  • 迁移学习的研究领域
  • 迁移学习的应用
  • 基础知识
  • 迁移学习的基本方法
  • 第一类方法:数据分布自适应
  • 第二类方法:特征选择
  • 第三类方法:子空间学习
  • 深度迁移学习
  • 上手实践
  • 迁移学习前沿
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The new Coronavirus is spreading rapidly and it has taken the lives of many people so far. The virus has destructive effects on the human lung and early detection is very important. Deep Convolution neural networks are a powerful tool in classifying images. Therefore, in this paper a hybrid approach based on a deep network is presented. Feature vectors were extracted by applying a deep convolution neural network on the images and effective features were selected by the binary differential meta-heuristic algorithm. These optimized features were given to the SVM classifier. A database consisting of three categories of images as COVID-19, pneumonia, and healthy included 1092 X-ray samples was considered. The proposed method achieved an accuracy of 99.43%, a sensitivity of 99.16%, and a specificity of 99.57%. Our results demonstrate the suggested approach is better than recent studies on COVID-19 detection with X-ray images.

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The new Coronavirus is spreading rapidly and it has taken the lives of many people so far. The virus has destructive effects on the human lung and early detection is very important. Deep Convolution neural networks are a powerful tool in classifying images. Therefore, in this paper a hybrid approach based on a deep network is presented. Feature vectors were extracted by applying a deep convolution neural network on the images and effective features were selected by the binary differential meta-heuristic algorithm. These optimized features were given to the SVM classifier. A database consisting of three categories of images as COVID-19, pneumonia, and healthy included 1092 X-ray samples was considered. The proposed method achieved an accuracy of 99.43%, a sensitivity of 99.16%, and a specificity of 99.57%. Our results demonstrate the suggested approach is better than recent studies on COVID-19 detection with X-ray images.

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