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ICTIR '21: The 2021 ACM SIGIR International Conference on the Theory of Information Retrieval, Virtual Event, Canada, July 11, 2021

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Fairness and Control of Exposure in Two-sided Markets
Thorsten Joachims

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Effective and Privacy-preserving Federated Online Learning to Rank
Shuyi Wang | Bing Liu | Shengyao Zhuang | Guido Zuccon

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Towards Axiomatic Explanations for Neural Ranking Models
Michael Völske | Alexander Bondarenko | Maik Fröbe | Benno Stein | Jaspreet Singh | Matthias Hagen | Avishek Anand

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User Fairness, Item Fairness, and Diversity for Rankings in Two-Sided Markets
Lequn Wang | Thorsten Joachims

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Pareto Solutions vs Dataset Optima: Concepts and Methods for Optimizing Competing Objectives with Constraints in Retrieval
Soumyajit Gupta | Gurpreet Singh | Anubrata Das | Matthew Lease

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Incorporating Widget Positioning in Interaction Models of Search Behaviour
Nirmal Roy | Arthur Câmara | David Maxwell | Claudia Hauff

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The Impact of Entity Cards on Learning-Oriented Search Tasks
Sara Salimzadeh | David Maxwell | Claudia Hauff

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Untangling the Concept of Task in Information Seeking and Retrieval
Ayah Soufan | Ian Ruthven | Leif Azzopardi

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An Integrated Model of Task, Information Needs, Sources and Uncertainty to Design Task-Aware Search Systems
Shawon Sarkar | Chirag Shah

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Sentiment Intensity Prediction using Neural Word Embeddings
Amal Htait | Leif Azzopardi

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News Article Retrieval in Context for Event-centric Narrative Creation
Nikos Voskarides | Edgar Meij | Sabrina Sauer | Maarten de Rijke

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Can Language Models Identify Wikipedia Articles with Readability and Style Issues?
Yang Liu | Alan Medlar | Dorota Glowacka

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Multi-label Classification of Short Texts with Label Correlated Recurrent Neural Networks
Zhiyuan Peng | Behnoush Abdollahi | Min Xie | Yi Fang

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The Simplest Thing That Can Possibly Work: (Pseudo-)Relevance Feedback via Text Classification
Xiao Han | Yuqi Liu | Jimmy Lin

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Ensemble Distillation for BERT-Based Ranking Models
Honglei Zhuang | Zhen Qin | Shuguang Han | Xuanhui Wang | Michael Bendersky | Marc Najork

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Ranking by Language Similarity for Resource Scarce Southern Bantu Languages
Catherine Chavula | Hussein Suleman

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Understanding the Effectiveness of Reviews in E-commerce Top-N Recommendation
Zhichao Xu | Hansi Zeng | Qingyao Ai

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Asking Clarifying Questions Based on Negative Feedback in Conversational Search
Keping Bi | Qingyao Ai | W. Bruce Croft

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Towards Facet-Driven Generation of Clarifying Questions for Conversational Search
Ivan Sekulic | Mohammad Aliannejadi | Fabio Crestani

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Effective Query Formulation in Conversation Contextualization: A Query Specificity-based Approach
Dipasree Pal | Debasis Ganguly

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A Modern Perspective on Query Likelihood with Deep Generative Retrieval Models
Oleg Lesota | Navid Rekabsaz | Daniel Cohen | Klaus Antonius Grasserbauer | Carsten Eickhoff | Markus Schedl

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Modality Effects When Simulating User Querying Tasks
Joel Mackenzie | Alistair Moffat

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Extracting per Query Valid Explanations for Blackbox Learning-to-Rank Models
Jaspreet Singh | Megha Khosla | Zhenye Wang | Avishek Anand

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Recommending Search Queries in Documents Using Inter N-Gram Similarities
Eilon Sheetrit | Yaroslav Fyodorov | Fiana Raiber | Oren Kurland

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Decomposition and Interleaving for Variance Reduction of Post-click Metrics
Kojiro Iizuka | Yoshifumi Seki | Makoto P. Kato

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ERR is not C/W/L: Exploring the Relationship Between Expected Reciprocal Rank and Other Metrics
Leif Azzopardi | Joel Mackenzie | Alistair Moffat

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A Fast and Exact Randomisation Test for Comparing Two Systems with Paired Data
Rikiya Suzuki | Tetsuya Sakai

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How do Metric Score Distributions affect the Type I Error Rate of Statistical Significance Tests in Information Retrieval?
Julián Urbano | Matteo Corsi | Alan Hanjalic

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A Discriminative Semantic Ranker for Question Retrieval
Yinqiong Cai | Yixing Fan | Jiafeng Guo | Ruqing Zhang | Yanyan Lan | Xueqi Cheng

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Evaluating BERT-based Rewards for Question Generation with Reinforcement Learning
Peide Zhu | Claudia Hauff

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Passage Similarity and Diversification in Non-factoid Question Answering
Lakshmi Vikraman | Ali Montazeralghaem | Helia Hashemi | W. Bruce Croft | James Allan

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A Novel Approach for Mining Team Leaders in Community Question Answering
Sepideh Entezari Maleki | Mahmood Neshati

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More Robust Dense Retrieval with Contrastive Dual Learning
Yizhi Li | Zhenghao Liu | Chenyan Xiong | Zhiyuan Liu

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Pseudo-Relevance Feedback for Multiple Representation Dense Retrieval
Xiao Wang | Craig Macdonald | Nicola Tonellotto | Iadh Ounis

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Semantic Hilbert Space for Interactive Image Retrieval
Amit Kumar Jaiswal | Haiming Liu | Ingo Frommholz

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BERT-based Dense Retrievers Require Interpolation with BM25 for Effective Passage Retrieval
Shuai Wang | Shengyao Zhuang | Guido Zuccon

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Session details: Keynote Talk
Yi Fang

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Session details: Session 2A - Ranking (2)
Djoerd Hiemstra

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Session details: Session 4A - Question Answering
Debasis Ganguly

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Session details: Session 1C - Content Analysis
Makoto P. Kato

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Session details: Session 1A - Ranking (1)
Qingyao Ai

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Session details: Session 4B - Semantic Retrieval
Harrie Oosterhuis

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Session details: Session 3A - Queries
Guido Zuccon

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Session details: Session 1B - User Interaction
Fabio Crestani

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Session details: Session 2B - Conversational Search
Hamed Zamani

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Session details: Session 3B - Evaluation
Mohammad Aliannejadi