Foreword

It is our great pleasure to welcome you to the 21st ACM SIGKDD Conference on Knowledge Discovery and Data Mining (KDD). The annual ACM SIGKDD conference is the premier international forum for data science, data mining, knowledge discovery and big data. It brings together researchers and practitioners from academia, industry, and government to share their ideas, research results and experiences. KDD-2015 features 4 plenary keynote presentations, 12 invited talks, 228 paper presentations, a discussion panel, a poster session, 14 workshops, 12 tutorials, 27 exhibition booths, the KDD Cup competition, and a banquet at the Dockside Pavilion at the Sydney Darling Harbour. As always, KDD-2015 attracted presenters and delegates from around the world. It is with great pleasure that we bring this international conference for the first time to the southern hemisphere. This year we again had a strong set of submissions. There were 819 submissions to the Research Track, of which 160 papers were accepted. There were 189 submissions to the Industry & Government Track, of which 68 papers were accepted. All papers submitted to the Research Track and to the Industry & Government Tracks were subjected to a rigorous review process. They were initially screened by the Chairs of the respective tracks, and a small number of papers that did not comply with the formatting requirements or which violated the dual submission policy were summarily rejected. At least three reviewers and a meta- reviewer were assigned to all remaining papers based on the results of a bidding process. The authors were able to read the reviews and provide a response. The meta-reviewers then had an opportunity to consider all reviews and author responses. This then initiated a discussion during which all reviewers of a paper had the opportunity to read each other’s reviews and the author responses and to update their reviews as appropriate. In a few cases, the meta-reviewers added another reviewer at this stage to gain expert opinion on specific issues. The meta-reviewers then made recommendations on acceptance or rejection to the track chairs. The track chairs then assessed the meta-reviews, reviews, author responses and discussions to make a final decision. In a few cases, they also solicited further expert reviews and meta-reviews to resolve specific questions. Thus, all papers were assessed by at least four and up to seven discipline experts. All accepted papers were presented both as a 20-minute talk and as a poster. The Industry & Government Invited Talk Track features 12 talks from world renowned experts who have played a significant role in developing and deploying large-scale data mining applications and systems in their respective fields with clearly measurable and meaningful impact. We trust that this opportunity for the KDD community to hear directly from senior leaders in industry and government will inspire new advances and broader interdisciplinary collaboration between researchers, industry and government counterparts. Featured topics in this year’s Industry & Government Invited Talk Track include applications in cloud intelligence, personal finance, insurance, fraud, marketing, advertising, and telecommunications. Additionally, we have focused on key enabling BigData infrastructure for KDD technologies with talks on highly-scalable and open source solutions that are quickly becoming mainstream. We continued the conference’s tradition of strong workshop and tutorial programs. This year there are 9 full-day workshops, 5 half-day workshops, and 12 tutorials. We would like to thank our generous sponsors who are a very important part of the conference. The SIGKDD conference series depends on a massive voluntary effort and we thank the members of the Organizing Committee and our other colleagues who have volunteered their time to make this conference a

iii success. Special thanks are due to the Sponsorship Chair, the Treasurer, the Panel Co-Chairs, the Publications Co-Chairs, the KDD Cup Committee, the Awards Chairs and the Awards Committee, and the Publicity Chairs. We are grateful to the several program committees that provided the advice necessary to put together the program – the Research Track Program Committee, the Research Track Senior Program Committee, the Industry & Government Track Program Committee, the Industry & Government Track Senior Program Committee, the Industry & Government Track Invited Talks Advisory Committee, the Workshop Program Committee, and the Tutorial Program Committee. This voluntary effort has been supported by the local arrangement team at the Advanced Analytics Institute, the University of Technology Sydney, the Hilton Sydney Hotel, the staff of the CMT online review system, and many other volunteers. We are further grateful to the Executive Committee which has provided expert advice, guidance and oversight. We also thank the many contributors to the conference, the authors, keynote and invited speakers, session chairs, tutors, workshop organisers and participants. It is your content that is the core of the conference. We hope that you will find this program interesting and thought-provoking and that the conference will provide you with a valuable opportunity to share ideas with other researchers and practitioners from around the world.

Longbing Cao and Chengqi Zhang KDD-2015 General Chairs

Thorsten Joachims and Geoff Webb KDD-2015 Program Committee Chairs

Dragos Margineantu and Graham Williams KDD-2015 Industry & Government Track Program Chairs

Rajesh Parekh and Usama Fayyad KDD-2015 Industry & Government Invited Talks Chairs

Tina Eliassi-Rad and Johannes Fürnkranz KDD-2015 Workshop Chairs

Jian Pei and Zhi-Hua Zhou KDD-2015 Tutorial Chairs

Ron Bekkerman and Jie Tang KDD Cup-2015 Chairs

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