Publications
Conference/Journal
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2019
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2018
- A Quest for Structure:Jointly Learning the Graph Structure and Semi-Supervised Classification
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Xuan Wu∗, Lingxiao Zhao∗, Leman Akoglu
ACM CIKM 2018, Turin, Italy
- Online Localized Change Detection for Sensor Data on a Graph
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Bryan Hooi, Leman Akoglu, Dhivya Eswaran, Hyun Ah Song, Amritanshu Pandey, Marko Jereminov, Larry Pileggi, Christos Faloutsos
ACM CIKM 2018, Turin, Italy
- Incorporating Privileged Information to Unsupervised Anomaly Detection
[arXiv] [
project page ]
Shubhranshu Shekhar & Leman Akoglu
ECML PKDD 2018, Dublin, Ireland
Best Student Machine Learning Paper Runner-up Award
- Contextual Outlier Detection with Multiple Contexts: Application to Ad Fraud
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Meghanath Macha, Deepak Pai, Leman Akoglu
ECML PKDD 2018, Dublin, Ireland
- Beyond Outlier Detection: LookOut for Pictorial Explanation
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Nikhil Gupta, Dhivya Eswaran, Neil Shah, Leman Akoglu, Christos Faloutsos
ECML PKDD 2018, Dublin, Ireland
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- Explaining Anomalies in Groups with Characterizing Subspace Rules
[arXiv] [
data & code]
Meghanath Macha and Leman Akoglu
ECML PKDD 2018 (Journal Track), Dublin, Ireland
- A Lens into Employee Peer Reviews via Sentiment-Aspect Modeling
[
code]
Abhinav Maurya, Leman Akoglu, Ramayya Krishnan, Daniel Bay
ACM/IEEE ASONAM 2018 (Industry Track), Barcelona, Spain
- xStream: Outlier Dete‘x’ion in Feature-Evolving Data Streams
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Emaad A. Manzoor, Hemank Lamba, Leman Akoglu
ACM SIGKDD 2018, London, UK
- Robust Semi-Supervised Learning on Multiple Networks with Noise
[
data & code]
Junting Ye and Leman Akoglu
PAKDD 2018, Melbourne, Australia
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2017
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- Automatic Detection of Online Recruitment Frauds: Characteristics, Methods, and a Public Dataset
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Sokratis Vidros, Constantinos Kolias, Georgios Kambourakis, Leman Akoglu
Future Internet, 9(1), 6; doi:10.3390/fi9010006, Mar 2017.
- A Domain-Agnostic Approach to Spam-URL Detection via Redirects
[
data] [slides]
Heeyoung Kwon, Mirza Basim Baig, Leman Akoglu
PAKDD 2017, Jeju, South Korea
2016
- Sequential Ensemble Learning for Outlier Detection: A Bias-Variance Perspective
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
[arXiv] [
project page] [
ODDS data repo]
Shebuti Rayana, Wen Zhong, Leman Akoglu
IEEE ICDM 2016, Barcelona, Spain
- Optimizing Network Robustness by Edge Rewiring: A General Framework
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Hau Chan and Leman Akoglu
Data Mining and Knowledge Discovery (DAMI), Volume 30, Issue 5, pp 1395–1425, Sep 2016.
- Fast Memory-Efficient Anomaly Detection in Streaming Heterogeneous Graphs
(full)
[
project page]
Emaad A. Manzoor, Sadegh M. Milajerdi, Leman Akoglu
ACM SIGKDD 2016, San Francisco, CA
- Temporal Opinion Spam Detection by Multivariate Indicative Signals
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
[arXiv] [
code] [poster]
Junting Ye, Santhosh Kumar, Leman Akoglu
ICWSM 2016, Cologne, Germany
- GOTCHA! Network-based Fraud Detection for Social Security Fraud
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Veronique Van Vlasselaer, Tina Eliassi-Rad, Leman Akoglu, Monique Snoeck, Bart Baesens
Management Science (INFORMS), MS-14-00232.R4, 2016.
- Less is More: Building Selective Anomaly Ensembles
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Shebuti Rayana and Leman Akoglu
Transactions on Knowledge Discovery from Data (TKDD), 10(4): 42, 2016.
- Scalable Anomaly Ranking of Attributed Neighborhoods
[
project page]
Bryan Perozzi and Leman Akoglu
SIAM SDM 2016, Miami, Florida
Best Research Paper Runner-up Award
- Collective Opinion Spam Detection using Active Inference
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Shebuti Rayana and Leman Akoglu
SIAM SDM 2016, Miami, Florida
- BIRDNEST: Bayesian Inference for Ratings-Fraud Detection
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Bryan Hooi, Neil Shah, Alex Beutel, Stephan Gunnemann, Leman Akoglu, Mohit Kumar, Disha Makhija, Christos Faloutsos
SIAM SDM 2016, Miami, Florida
- Optimizing Network Robustness by Edge Rewiring: A General Framework
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Hau Chan and Leman Akoglu
ECML PKDD 2016, Journal Track
2015
- Discovering Opinion Spammer Groups by Network Footprints
[
code] [slides]
Junting Ye and Leman Akoglu
ECML PKDD 2015, Porto, Portugal
- Collective Opinion Spam Detection: Bridging Review Networks and Metadata
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
[
project page] [slides]
Shebuti Rayana and Leman Akoglu
ACM SIGKDD 2015, Sydney, AU
- AFRAID: Fraud Detection via Active Inference in Time-evolving Social Networks
Veronique Van Vlasselaer, Tina Eliassi-Rad, Leman Akoglu, Monique Snoeck, Bart Baesens.
IEEE/ACM ASONAM 2015, Paris, France
- Effects of Tag Usage on Question Response Time: Analysis and Prediction in StackOverflow
Vasudev Bhat, Adheesh Gokhale, Ravi Jadhav, Jagat Sastry Pudipeddi, Leman Akoglu
Social Network Analysis and Mining, (SNAM-D-14-00101R1) Springer, 2015.
- Correlation of Node Importance Measures: An Empirical Study through Graph Robustness
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/ppticon.gif)
Mirza Basim Baig and Leman Akoglu
WWW 2015 Companion, Web Science Track (13.8%), Florence, Italy
Invited to a special issue of the Journal of Web Science
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- APATE: A Novel Approach for Automated Credit Card Transaction Fraud Detection using Network-Based Extensions.
Veronique Van Vlasselaer, Cristian Bravo, Olivier Caelen, Tina Eliassi-Rad, Leman Akoglu, Monique Snoeck, Bart Baesens.
Decision Support Systems, May 2015.
- Less is More: Building Selective Anomaly Ensembles
[
project page]
(with Application to Event Detection in Temporal Graphs)
Shebuti Rayana and Leman Akoglu
SIAM SDM 2015, Vancouver, BC, Canada (Oral presentation)
- Where Graph Topology Matters: The Robust Subgraph Problem
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/codeicon.gif)
Hau Chan, Shuchu Han, Leman Akoglu
SIAM SDM 2015, Vancouver, BC, Canada (Oral presentation)
Best Research Paper Award Invited to Statistical Analysis and Data Mining
- Guilt-by-Constellation: Fraud Detection by Suspicious Clique Memberships.
Veronique Van Vlasselaer, Leman Akoglu, Tina Eliassi-Rad, Monique Snoeck, Bart Baesens.
HICSS 2015, Kauai, HI
2014
- Fast Nearest Neighbor Search on Large Time-Evolving Graphs.
[slides]
Leman Akoglu, Rohit Khandekar, Vibhore Kumar, Srinivasan Parthasarathy, Deepak Rajan, Kun-Lung Wu.
ECML PKDD 2014, Nancy, France
- Focused Clustering and Outlier Detection in Large Attributed Graphs.
[slides] [
code] [project page]
Bryan Perozzi, Leman Akoglu, Patricia Iglesias Sanchez, Emmanuel Müller.
ACM SIGKDD 2014, NYC, New York
- Min(e)d Your Tags: Analysis of Question Response Time in StackOverflow.
(Full paper) [slides]
Vasudev Bhat, Adheesh Gokhale, Ravi Jadhav, Jagat S. Pudipeddi, Leman Akoglu.
IEEE/ACM ASONAM 2014, Beijing, China
Invited to appear in SNAM (Social Network Analysis and Mining) journal by Springer
(ASONAM best papers)
- Joint Voting Prediction for Questions and Answers in CQA.
[MIT Tech Review]
Yuan Yao, Hanghang Tong, Tao Xie, Leman Akoglu, Feng Xu, Jian Lu.
IEEE/ACM ASONAM 2014, Beijing, China
Invited to appear in SNAM (Social Network Analysis and Mining) journal by Springer
(ASONAM best papers)
- Graph-based Anomaly Detection and Description: A Survey.
[bibtex]
Leman Akoglu, Hanghang Tong, Danai Koutra.
Data Mining and Knowledge Discovery (DAMI), April 2014.
- Fast Information-Theoretic Agglomerative Co-Clustering
[supplementary] [code]
Tiantian Gao and Leman Akoglu.
ADC 2014, Brisbane, Australia
Best Paper Award
- Quantifying Political Polarity based on Bipartite Opinion Networks
[code]
Leman Akoglu.
ICWSM 2014, Ann Arbor, Michigan
- ConnotationWordNet: Learning Connotation of the Word+Sense Network
(Full paper)
Jun Seok Kang, Song Feng, Leman Akoglu, Yejin Choi.
ACL 2014, Baltimore, Maryland
- Make It or Break It: Manipulating Robustness in Large Networks
[slides] [tech report]
Hau Chan, Leman Akoglu, Hanghang Tong
SIAM SDM 2014, Philadelphia, PA
- User Churn in Focused Q&A Sites: Characterizations and Prediction
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/ppticon.gif)
Jagat S. Pudipeddi, Leman Akoglu, Hanghang Tong
WWW 2014, Seoul, Korea
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2013
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- External Evaluation of Topic Models: A Graph Mining Approach
[long version]
Hau Chan and Leman Akoglu
IEEE ICDM 2013, Dallas, Texas
- Sex Differences in the Human Connectome
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Vivek Kulkarni, Jagat S. Pudipeddi, Leman Akoglu, Joshua Vogelstein, Jacob Vogelstein, Sephira Ryman, Rex E. Jung
BHI 2013, Maebashi, Japan
- Opinion Fraud Detection in Online Reviews using Network Effects
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/codeicon.gif)
Leman Akoglu, Rishi Chandy, Christos Faloutsos
ICWSM 2013, Boston, MA
- Do more views of a graph help? Community Detection and Clustering in Multi-Graphs
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Evangelos E. Papalexakis, Leman Akoglu, Dino Ienco
FUSION 2013, Istanbul, Turkey
- Mining Connection Pathways for Marked Nodes in Large Graphs
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/ppticon.gif)
Leman Akoglu, Jilles Vreeken, Hanghang Tong, Duen Horng Chau, Nikolaj Tatti, Christos Faloutsos
SIAM SDM 2013, Austin, Texas
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- Fast and Reliable Anomaly Detection in Categoric Data
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Leman Akoglu, Hanghang Tong, Jilles Vreeken, Christos Faloutsos
ACM CIKM 2012, Maui, Hawaii
- TourViz: Interactive Visualization of Connection Pathways in Large Graphs
(Demo paper)
Duen Horng Chau, Leman Akoglu, Jilles Vreeken, Hanghang Tong, Christos Faloutsos
ACM SIGKDD 2012, Beijing, China
- RolX: Structural Role Extraction & Mining in Large Graphs
![images/pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Keith Henderson, Brian Gallagher, Tina Eliassi-Rad, Hanghang Tong, Sugato Basu, Leman Akoglu, Danai Koutra, Lei Li, Christos Faloutsos.
ACM SIGKDD 2012, Beijing, China
- Quantifying Reciprocity in Large Weighted Communication Networks
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/ppticon.gif)
Leman Akoglu, Pedro Olmo Vaz de Melo, Christos Faloutsos.
PAKDD 2012, Kuala Lumpur, Malaysia
Received the PAKDD Student Travel Grant Award
- OPAvion: Mining and visualization in large graphs
(Demo paper)
Leman Akoglu*, Duen Horng Chau*, U Kang*, Danai Koutra*, Christos Faloutsos
SIGMOD 2012, Scottsdale, Arizona
- PICS: Parameter-free Identification of Cohesive Subgroups in Large Attributed Graphs
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/codeicon.gif)
Leman Akoglu, Hanghang Tong, Brendan Meeder, Christos Faloutsos.
SIAM SDM 2012, Anaheim, CA
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- It’s Who You Know: Graph Mining Using Recursive Structural Features
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Keith Henderson, Brian Gallagher, Lei Li, Leman Akoglu, Tina Eliassi-Rad, Hanghang Tong, Christos Faloutsos.
ACM SIGKDD 2011, San Diego, CA
- Patterns on the Connected Components of Terabyte-Scale Graphs
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
U Kang, Mary McGlohon, Leman Akoglu, Christos Faloutsos.
IEEE ICDM 2010, Sydney, Australia
- Surprising Patterns for the Call Duration Distribution of Mobile Phone Users
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Pedro Olmo Vaz de Melo, Leman Akoglu, Christos Faloutsos, Antonio Loureiro.
ECML PKDD 2010, Barcelona, Spain
Received the Google ECML/PKDD 2010 Conference and Travel Grant Award for Women in CS
- MetricForensics: A Multi-Level Approach for Mining Volatile Graphs
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Keith Henderson, Tina Eliassi-Rad, Christos Faloutsos, Leman Akoglu, Lei Li, Koji Maruhashi, B. Aditya Prakash, Hanghang Tong.
ACM SIGKDD 2010, Washington, DC
- OddBall: Spotting Anomalies in Weighted Graphs
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/codeicon.gif)
Leman Akoglu, Mary McGlohon, Christos Faloutsos.
PAKDD 2010, Hyderabad, India
Best Research Paper Award
- RTG: A Recursive Realistic Graph Generator using Random Typing
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/codeicon.gif)
Leman Akoglu and Christos Faloutsos.
ECML PKDD 2009, Bled, Slovenia
Best Knowledge Discovery Paper Award
- Large Human Communication Networks: Patterns and a Utility-Driven Generator
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Nan Du, Christos Faloutsos, Bai Wang, Leman Akoglu.
ACM SIGKDD 2009, Paris, France
- RTM : Laws and a Recursive Generator for Weighted Time-Evolving Graphs
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/ppticon.gif)
Leman Akoglu, Mary McGlohon, Christos Faloutsos.
ICDM 2008, Pisa, Italy
- Weighted Graphs and Disconnected Components: Patterns and a Generator
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/ppticon.gif)
Mary McGlohon, Leman Akoglu, Christos Faloutsos.
ACM SIGKDD 2008, Las Vegas, NV
Workshop
- EdgeCentric: Anomaly Detection in Edge-Attributed Networks
[
code]
Neil Shah, Alex Beutel, Bryan Hooi, Leman Akoglu, Stephan Gunnemann, Disha Makhija, Mohit Kumar, Christos Faloutsos.
IEEE ICDM Workshop on Data Mining for Cyber Security, Barcelona, Spain, Dec. 2016.
- The Politics of Routing: Investigating the Relationship Between AS Connectivity and Internet Freedom
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Rachee Singh, Hyungjoon Koo, Najmehalsadat Miramirkhani, Fahimeh Mirhaj, Leman Akoglu, Phillipa Gill.
FOCI/USENIX, Austin, TX, USA, Aug. 2016.
- An Ensemble Approach for Event Detection and Characterization in Dynamic Graphs
![images/pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Shebuti Rayana, Leman Akoglu
ACM SIGKDD 2nd Workshop on Outlier Detection and Description (ODD^2@KDD 2014), NYC, NY, Aug. 2014
- Proceedings: KDD 2014 Workshop on Outlier Detection and Description under Data Diversity
![images/pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Charu Aggarwal, Leman Akoglu, Emmanuel Muller, Raymond T. Ng (editors)
ACM SIGKDD 2nd Workshop on Outlier Detection and Description (ODD^2@KDD 2014), NYC, NY, Aug. 2014
- Proceedings of the KDD 2013 Workshop on Outlier Detection and Description
![images/pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/pdficon.png)
Leman Akoglu, Emmanuel Muller, Jilles Vreeken (editors)
ACM SIGKDD 1st Workshop on Outlier Detection and Description (ODD@KDD 2013), Chicago, IL, USA, Aug. 2013.
- Mining and Visualizing Connection Pathways in Large Information Networks
(poster)
Leman Akoglu, Jilles Vreeken, Hanghang Tong, Duen Horng Chau, Christos Faloutsos
WIN: Workshop on Information in Networks, New York, USA, Sep. 2012.
- ValuePick: Towards a Value-Oriented Dual-Goal Recommender System
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/ppticon.gif)
Leman Akoglu and Christos Faloutsos.
ICDM Workshop on Optimization Based Methods for Emerging Data Mining Problems, Sydney, Australia, Dec. 2010.
- Event Detection in Time Series of Mobile Communication Graphs
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/ppticon.gif)
Leman Akoglu and Christos Faloutsos.
27th Army Science Conference, Orlando, Florida, Dec. 2010.
- Structure, Tie Persistence and Event Detection in Large Phone and SMS Networks
![pdf-file-icon](http://www.andrew.cmu.edu/user/lakoglu/images/ppticon.gif)
Leman Akoglu and Bhavana Dalvi.
ACM SIGKDD Workshop on Mining and Learning with Graphs, Washington, DC, July 2010.