1 / 13

Supervised Random Walks: Predicting and Recommending Links in Social Networks

Supervised Random Walks: Predicting and Recommending Links in Social Networks. Lars Backstrom (Facebook) & Jure Leskovec (Stanford) Proc. of WSDM 2011 Present by Mo Mingzhen. Problem. Friendship is important on social networks How to predict the future interaction

kyra-chavez
Télécharger la présentation

Supervised Random Walks: Predicting and Recommending Links in Social Networks

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Supervised Random Walks: Predicting and Recommending Linksin Social Networks Lars Backstrom (Facebook) & Jure Leskovec (Stanford) Proc. of WSDM 2011 Present by Mo Mingzhen

  2. Problem • Friendship is important on social networks • How to predict the future interaction • How to recommend potential friends to new user? Link Prediction Problem

  3. Motivation • Predicting future interaction brings direct business consequences: possible collaborations • Beyond social networks: predicting coauthor/collaborations • In link prediction problem, how to combine the node and edge attributes remains an open challenge

  4. Method • Based on the Supervised Random Walks • Combines the network structure with the characteristics of nodes and edges • Develop an algorithm to estimate the edge strength • bias a PageRank-like random walk to visits given nodes more often

  5. Problem Formulation • Given G(V, E) • A start point s, learning candidate C = {ci} • Destination nodes D = {d1,…,dk}, no-link nodes L = {l1,…,ln}, C = D ∪ L • For edge (u, v) we compute the strength auv = fw(ψuv)

  6. Optimization • p is the vector of PageRank scores • A “soft” version

  7. Algorithm

  8. Experiments on Synthetic Data • A scale-free graph G with 10,000 nodes • Evaluated by classification accuracy • Strength func. *AUC – Area under the ROC curve. 1.0 means perfect classification and 0.5 means random guessing.

  9. Experiments on Real Data • Four co-authorship networks and the Facebook network of Iceland • Strength func.

  10. Interaction Procedure • The method basically converges in only about 25 iterations

  11. Results LR: logistic regression, Prec@20: precision at top 20

  12. Methods Comparison • some unsupervised baselines & two supervised learning methods

  13. Conclusion • The Supervised Random Walks has great improvement over Random Walks. • It outperforms supervised machine learning techniques • It combines rich node and edge features with the structure of the network • Apply to: recommendations, anomaly detection, missing link, and expertise search and ranking

More Related