Kamvar, Sepandar and Haveliwala, Taher and Manning, Chris and Golub, Gene (2003) *Extrapolation Methods for Accelerating PageRank Computations.* In: Twelfth International World Wide Web Conference (WWW 2003), May 20-24, 2003, Budapest, Hungary.

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## Abstract

We present a novel algorithm for the fast computation of PageRank, a hyperlink-based estimate of the ``importance'' of Web pages. The original PageRank algorithm uses the Power Method to compute successive iterates that converge to the principal eigenvector of the Markov matrix representing the Web link graph. The algorithm presented here, called Quadratic Extrapolation, accelerates the convergence of the Power Method by periodically subtracting off estimates of the nonprincipal eigenvectors from the current iterate of the Power Method. In Quadratic Extrapolation, we take advantage of the fact that the first eigenvalue of a Markov matrix is known to be 1 to compute the nonprincipal eigenvectors using successive iterates of the Power Method. Empirically, we show that using Quadratic Extrapolation speeds up PageRank computation by 25--300\% on a Web graph of 80 million nodes, with minimal overhead. Our contribution is useful to the PageRank community and the numerical linear algebra community in general, as it is a fast method for determining the dominant eigenvector of a matrix that is too large for standard fast methods to be practical.

Item Type: | Conference or Workshop Item (Paper) | |
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Uncontrolled Keywords: | PageRank, link analysis, web search, eigenvector computation | |

Subjects: | Computer Science Miscellaneous | |

Projects: | Miscellaneous | |

Related URLs: | Project Homepage, Project Homepage, Project Homepage | http://infolab.stanford.edu/, http://infolab.stanford.edu/, http://www-nlp.stanford.edu/ |

ID Code: | 865 | |

Deposited By: | Import Account | |

Deposited On: | 27 Feb 2003 16:00 | |

Last Modified: | 24 Dec 2008 10:18 |

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