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arXiv 1401.0116cs.LG
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受控稀疏核学习

Controlled Sparsity Kernel Learning

Bell Labs Research(贝尔实验室研究院);Indian Institute of Science(印度科学学院)

Dinesh Govindaraj, Raman Sankaran, Sreedal Menon, Chiranjib Bhattacharyya

摘要:

基于支持向量机的多核学习算法由于在目标分类等应用问题上的成功应用而成为近年来的研究热点。这一成功是由于MKL能够从各种特征内核中进行选择,以确定最佳内核组合。但是MKL的初始公式只能选择最好的特征,而忽略了许多其他提供信息的内核。为了克服这一点,Lp范数为基础的制定提出了Kloft等。该公式能够通过控制参数p选择非稀疏的核集合。不幸的是,参数p对所选择的核的数量没有直接意义。我们已经观察到,对所选内核数量的更严格控制使我们在分类准确性方面优于这些技术,并且还有助于我们根据手头的时间要求对算法进行微调。在这项工作中,我们提出了一个受控稀疏核学习(CSKL)制定,可以严格控制我们希望选择的内核的数量。CSKL公式引入了一个参数t,它直接对应于所选择的核的数量。重要的是要注意,在t空间中的搜索是有限的和快速相比,p。我们还提供了一个有效的减少梯度下降为基础的算法来解决CSKL制定,这是证明收敛。通过我们在Caltech 101 Object Categorization数据集上的实验,我们还表明,通过正确选择t,可以实现比以前的公式更好的准确性。

英文摘要:

Multiple Kernel Learning(MKL) on Support Vector Machines(SVMs) has been a popular front of research in recent times due to its success in application problems like Object Categorization. This success is due to the fact that MKL has the ability to choose from a variety of feature kernels to identify the optimal kernel combination. But the initial formulation of MKL was only able to select the best of the features and misses out many other informative kernels presented. To overcome this, the Lp norm based formulation was proposed by Kloft et. al. This formulation is capable of choosing a non-sparse set of kernels through a control parameter p. Unfortunately, the parameter p does not have a direct meaning to the number of kernels selected. We have observed that stricter control over the number of kernels selected gives us an edge over these techniques in terms of accuracy of classification and also helps us to fine tune the algorithms to the time requirements at hand. In this work, we propose a Controlled Sparsity Kernel Learning (CSKL) formulation that can strictly control the number of kernels which we wish to select. The CSKL formulation introduces a parameter t which directly corresponds to the number of kernels selected. It is important to note that a search in t space is finite and fast as compared to p. We have also provided an efficient Reduced Gradient Descent based algorithm to solve the CSKL formulation, which is proven to converge. Through our experiments on the Caltech101 Object Categorization dataset, we have also shown that one can achieve better accuracies than the previous formulations through the right choice of t.

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