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Web Graph Web Graph

Giant Global Graph Giant Global Graph

图论、线性代数若干概念回顾 图论、线性代数若干概念回顾

本次课大纲 本次课大纲

Web的大小 —网页总数 Web的大小 —网页总数

Capture-Recapture Model Capture-Recapture Model

Web的大小 Web的大小

Overlap analysis Overlap analysis

Web的形状 Web的形状

Bow-tie Components Bow-tie Components

Component Properties Component Properties

站点入度分布 站点入度分布

80/20 原则 80/20 原则

Power law Power law

Power law Power law

Power Law Size and Connectivity Power Law Size and Connectivity

Power Law Distribution -Examples Power Law Distribution -Examples

Random Graph. vs. Power Law Graph Random Graph. vs. Power Law Graph

Examples with Power Law Networks Examples with Power Law Networks

What does this mean? What does this mean?

小世界网络 小世界网络

The small world of WWW The small world of WWW

Implications for Web Implications for Web

Robustness and vulnerability Robustness and vulnerability

对网页重要性的评价 对网页重要性的评价

重要度的度量 Paul Erdös 重要度的度量 Paul Erdös

Page. Rank Page. Rank

谁重要一些? 谁重要一些?

声望模型 Reputation Model 声望模型 Reputation Model

1 2 3 1 2 3

先前那 4个点的例子也无解 先前那 4个点的例子也无解

即使有解,还有可能不唯一! 即使有解,还有可能不唯一!

Page. Rank Page. Rank

“Random Walker”模型 “Random Walker”模型

Random walker model Random walker model

Random Walker Model (continue) Random Walker Model (continue)

Stochastic matrix Stochastic matrix

还有一点问题 还有一点问题

Google Matrix特征向量求解 Google Matrix特征向量求解

问题 问题

例子( power iteration) 例子( power iteration)

小规模数据求解 小规模数据求解

State-of-art Page. Rank Technology State-of-art Page. Rank Technology

ODP-Biasing ODP-Biasing

Results Results

Results Results

References References

本次课小结 本次课小结

第一次编程作业 第一次编程作业

Thank You! Thank You!

阅读材料 阅读材料

Steve Lawrence Steve Lawrence

Larry Page & Sergey Brin Larry Page & Sergey Brin

Zipf’s law Zipf’s law

Co-citation分析 Co-citation分析

coc[i, j]=∑E[k, i]E[k, j] coc[i, j]=∑E[k, i]E[k, j]

修改模型 修改模型

解的存在性 解的存在性

The Perron-Frobenius Theorem The Perron-Frobenius Theorem

Random Walker Model (continue) Random Walker Model (continue)

HITS HITS

Authority and Hub scores Authority and Hub scores

Power Iteration on: Power Iteration on:

Overlap analysis Overlap analysis