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合理的内核：一般的机器学习的文本分析的框架，语音和生物序列
Rational Kernels: A General Machine Learning Framework for the Analysis of Text, Speech and Biological Sequences |
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| 课程网址: |
http://videolectures.net/clsp_cortes_kernels/
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| 主讲教师: |
Corinna Cortes
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| 开课单位: |
谷歌公司
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| 开课时间: |
2012-02-15
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| 课程语种: |
英语
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| 中文简介: |
核方法被广泛应用于统计学习技术，由于在高维特征空间，其优异的性能和计算效率。然而，文本或语音数据总是不能由固定长度的向量，传统的内核句柄表示。在这一讲中，我们介绍了一个总体框架，合理的内核，内核扩展技术来处理可变长度的序列和更普遍地处理大量的加权交替序列的加权自动机为代表的。从抽象的计算复杂目标的合理内核，可以使用一般的加权自动机算法已经被广泛使用，我们将简要地回顾在文本和语音处理和容易实施。合理的内核提供的定义和字手机格在语音挖掘应用特别有用的之间的相似性度量的一个总体框架设计。作为相似性度量，也可以用在支持向量机和显着提高口语对话的分类性能，在困难的任务，如AT&T有什么我可以帮你（HMIHY）系统。我们提出了几个例子来说明这些应用程序的合理内核。我们终于表明许多字符串核函数计算生物学中的应用通常被认为是特定情况下的合理内核。
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| 课程简介: |
Kernel methods are widely used in statistical learning techniques due to their excellent performance and their computational efficiency in high-dimensional feature space. However, text or speech data cannot always be represented by the fixed-length vectors that the traditional kernels handle. In this talk, we introduce a general framework, Rational Kernels, that extends kernel techniques to deal with variable-length sequences and more generally to deal with large sets of weighted alternative sequences represented by weighted automata. Far from being abstract and computationally complex objects, rational kernels can be readily implemented using general weighted automata algorithms that have been extensively used in text and speech processing and that we will briefly review. Rational kernels provide a general framework for the definition and design of similarity measures between word or phone lattices particularly useful in speech mining applications. Viewed as a similarity measure, they can also be used in Support Vector Machines and significantly improve the spoken-dialog classification performance in difficult tasks such as the AT&T 'How May I Help You' (HMIHY) system. We present several examples of rational kernels to illustrate these applications. We finally show that many string kernels commonly considered in computational biology applications are specific instances of rational kernels.
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| 关 键 词: |
核方法; 内核; 计算效率
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| 课程来源: |
视频讲座网
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| 最后编审: |
2021-01-31：nkq
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| 阅读次数: |
46
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