News

09/22/2020: I will be serving as Sponsorship Co-Chair at IUI 2021 and as Demo Co-Chair at RecSys 2020.

05/20/2020: Outstanding Reviewer Award, PAKDD 2020.

About me

I am a data scientist at relationalAI: working on product recommendation and search in online retail. In particular I am working on session-based recommender systems, bundle recommendations, compatible and accessory recommendations, and product search using knowledge graph embeddings. Additionally I am interested in hybrid, explainable, and fair recommender systems, scalable statistical relational learning techniques, and entity resolution in heterogeneous structured and semi-structured relational networks. I successfully defended my Ph.D. on August 2018 on Resolution, Recommendation, and Explanation in Richly Structured Social Networks in UCSC. My advisor was Lise Getoor.

Publications

P. Kouki, I. Fountalis, N. Vasiloglou, X. Cui, E. Liberty, K. Al Jadda " From the Lab to Production: A Case Study of Session-Based Recommendations in the Home-Improvement Domain". 14th ACM Conference on Recommender Systems (RecSys), 2020
Acceptance Rate = 18%

P. Kouki, I. Fountalis, N. Vasiloglou, N. Yan, U. Ahsan, K. Al Jadda, H. Qu " Product Collection Recommendation in Online Retail". 13th ACM Conference on Recommender Systems (RecSys), 2019
Acceptance Rate = 24%

P. Kouki, J. Schaffer, J. Pujara, J. O' Donovan, L. Getoor " Generating and Understanding Personalized Explanations in Hybrid Recommender Systems". ACM Transactions on Interactive Intelligent Systems, Vol. 1, No. 1, Article 1 (TiiS Special Issue on Highlights of IUI 2019), 2019
To Appear

P. Kouki, J. Schaffer, J. Pujara, J. O'Donovan, and L. Getoor " Personalized Explanations for Hybrid Recommender Systems". 24th ACM Conference on Intelligent User Interfaces (IUI), 2019
Acceptance Rate = 25%, Outstanding Paper Award

G. Farnadi, P. Kouki, S. Thompson, S. Srinivasan, L. Getoor " A Fairness-aware Hybrid Recommender System". The 2nd FATREC Workshop on Responsible Recommendation, 2018

P. Kouki, J. Pujara, C. Marcum, L. Koehly, and L. Getoor " Collective Entity Resolution in Multi-Relational Familial Networks". Knowledge and Information Systems (KAIS) - 2018

P. Kouki" Resolution, Recommendation, and Explanation in Richly Structured Social Networks". Ph.D. Thesis, University of California Santa Cruz, 2018

P. Kouki, J. Pujara, C. Marcum, L. Koehly, and L. Getoor " Collective Entity Resolution in Familial Networks". IEEE International Conference on Data Mining (ICDM) - 2017 (selected as one of the best papers for possible publication in Knowledge and Information Systems (KAIS))
Acceptance Rate = 9.25%

P. Kouki, J. Schaffer, J. Pujara, J. O'Donovan, and L. Getoor " User Preferences for Hybrid Explanations". 11th ACM Conference on Recommender Systems (RecSys), 2017
Acceptance Rate = 16.4%

P. Kouki, C. Marcum, L. Koehly, and L. Getoor " Entity Resolution in Familial Networks". 12th International SIGKDD Workshop on Mining and Learning with Graphs (MLG), 2016

P. Kouki, S. Fakhraei, J. Foulds, M. Eirinaki, and L. Getoor " HyPER: A Flexible and Extensible Probabilistic Framework for Hybrid Recommender Systems". 9th ACM Conference on Recommender Systems (RecSys), 2015
Acceptance Rate = 21.4%

G. Athanasopoulos, A. Tsalgatidou, P. Kouki, I. Pogkas, and M. Pantazoglou " Adaptable Environmental Service Chains: The Challenges of Distributed Execution and Information Collection". Environmental Information Systems and Services Infrastructures and Platforms Workshop at EnviroInfo, 2010

Professional Service

Sponsorship Chair, IUI '21

Demo Chair, RecSys '21

Program Committee Member at RecSys ('18, '19, '20), AAAI ('20, '21), PAKDD ('20 Outstanding Reviewer ), IJCAI ('18, '19, '21) , SIGIR ('18, '20), UMAP ('20), FAccTRec ('20), ExUM ('20), WiML ('17, '18).

Education

Ph.D.Technology and Information Management Department, August 2018

University of California Santa Cruz
Concentration:Recommender Systems, Entity Resolution, Graphical Models.
Thesis: "Resolution, Recommendation, and Explanation in Richly Structured Social Networks"
Advisor: Lise Getoor
GPA: 4.0/4.0

M.Sc. Technology and Information Management Department, 2015

University of California Santa Cruz
Concentration: Recommender Systems, Data Mining, Information Retrieval
Thesis: "A Probabilistic Graphical Modeling Approach to Hybrid Recommender Systems"
Advisor: Lise Getoor
GPA: 4.0/4.0

M.Sc. Department of Informatics and Telecommunications, 2011

National and Kapodistrian University of Athens
Concentration: Advanced Information Systems
Thesis: "Sharing of Semantically Enhanced Information for the Adaptive Execution of Business Processes"
Advisor: Aphrodite Tsalgatidou
GPA: 8.67/10.0

B.Sc. Department of Informatics and Telecommunications, 2008

National and Kapodistrian University of Athens
Thesis: "Design, Test, Implementation in ASIC/FPGA of the AMBA bus, and Integration with a RISC processor"
Advisor: Antonis Pasxalis
GPA: 7.94/10.0

Professional Experience

Data Scientist 2019 - now
relationalAI:
Recommender systems in online Retail: bundle, accessory, and complementary recommendations, session-based recommendations. Search in online Retail using knowledge graph embeddings.


Research Assistance 9/2014 - 10/2018
Member of LINQS
Group, University of California Santa Cruz
Project: Resolution, Recommendation, and Explanation in Richly Structured Social Networks
Advisor: Lise Getoor


Research Intern 6/2014 - 8/2014, 6/2015 - 9/2015
Bosch Language Service, Bosch Research and Technology Center
Project: Emotion Detection in Short Documents
Mentors: Fuliang Weng, Qian Xian


Researcher and Software Engineer 1/2010 - 8/2013
Department of Informatics and Telecommunications, National and Kapodistrian University of Athens
Project: ENVISION
(ENVIronmental Services Infrastructure with ONtologies)
Advisor: Aphrodite Tsalgatidou

IT Support Engineer 6/2006-9/2006
Credit and Financial Supervision Department, Bank of Greece

Teaching Assistance

Business Information Systems Winter, Spring Quarters, 2014
Technology and Information Management Department, University of California Santa Cruz

Information System Analysis Spring Semesters 2010, 2011, 2012
Department of Informatics and Telecommunications, National and Kapodistrian University of Athens

Introduction To Programming Fall Semesters 2011, 2012
Department of Pharmacy, National and Kapodistrian University of Athens

Introduction To Programming Fall Semesters 2008, 2009
Department of Informatics and Telecommunications, National and Kapodistrian University of Athens

Numerical Analysis Spring Semester 2008
Department of Informatics and Telecommunications, National and Kapodistrian University of Athens