2020

Towards a Unified Quadrature Framework for Large-Scale Kernel Machines

Liu, Fanghui, Huang, Xiaolin, Chen, Yudong et al.

Understand

In this paper, we develop a quadrature framework for large-scale kernel machines via a numerical integration representation.

  • Considering that the integration domain and measure of typical kernels, e.g., Gaussian kernels, arc-cosine kernels, are fully symmetric, we leverage deterministic fully symmetric interpolatory rules to efficiently compute quadrature nodes and associated weights for kernel approximation.
  • The developed interpolatory rules are able to reduce the number of needed nodes while retaining a high approximation accuracy.
  • Further, we randomize the above deterministic rules by the classical Monte-Carlo sampling and control variates techniques with two merits: 1) The proposed stochastic rules make the dimension of the feature mapping flexibly varying, such that we can control the discrepancy between the original and approximate kernels by tuning the dimnension.

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