Search Results for author: Ali Vardasbi

Found 10 papers, 6 papers with code

Group Membership Bias

no code implementations5 Aug 2023 Ali Vardasbi, Maarten de Rijke, Fernando Diaz, Mostafa Dehghani

With group bias, the utility of the sensitive groups is under-estimated, hence, without correcting for this bias, a supposedly fair ranking is not truly fair.

Fairness Learning-To-Rank +1

Recent Advances in the Foundations and Applications of Unbiased Learning to Rank

no code implementations4 May 2023 Shashank Gupta, Philipp Hager, Jin Huang, Ali Vardasbi, Harrie Oosterhuis

This tutorial provides both an introduction to the core concepts of the field and an overview of recent advancements in its foundations along with several applications of its methods.

Fairness Learning-To-Rank

On the Impact of Outlier Bias on User Clicks

1 code implementation1 May 2023 Fatemeh Sarvi, Ali Vardasbi, Mohammad Aliannejadi, Sebastian Schelter, Maarten de Rijke

We therefore propose an outlier-aware click model that accounts for both outlier and position bias, called outlier-aware position-based model ( OPBM).

counterfactual Learning-To-Rank +1

State Spaces Aren't Enough: Machine Translation Needs Attention

no code implementations25 Apr 2023 Ali Vardasbi, Telmo Pessoa Pires, Robin M. Schmidt, Stephan Peitz

Structured State Spaces for Sequences (S4) is a recently proposed sequence model with successful applications in various tasks, e. g. vision, language modeling, and audio.

Language Modelling Machine Translation +2

Intersection of Parallels as an Early Stopping Criterion

1 code implementation19 Aug 2022 Ali Vardasbi, Maarten de Rijke, Mostafa Dehghani

Using this result, we propose to train two parallel instances of a linear model, initialized with different random seeds, and use their intersection as a signal to detect overfitting.

counterfactual Learning-To-Rank

Probabilistic Permutation Graph Search: Black-Box Optimization for Fairness in Ranking

1 code implementation28 Apr 2022 Ali Vardasbi, Fatemeh Sarvi, Maarten de Rijke

Different from PL, where pointwise logits are used as the distribution parameters, in PPG pairwise inversion probabilities together with a reference permutation construct the distribution.

Fairness Learning-To-Rank

Cross-Market Product Recommendation

1 code implementation13 Sep 2021 Hamed Bonab, Mohammad Aliannejadi, Ali Vardasbi, Evangelos Kanoulas, James Allan

We introduce and formalize the problem of cross-market product recommendation, i. e., market adaptation.

Domain Adaptation Meta-Learning +1

When Inverse Propensity Scoring does not Work: Affine Corrections for Unbiased Learning to Rank

1 code implementation24 Aug 2020 Ali Vardasbi, Harrie Oosterhuis, Maarten de Rijke

Our main contribution is a new estimator based on affine corrections: it both reweights clicks and penalizes items displayed on ranks with high trust bias.

counterfactual Learning-To-Rank +1

Cascade Model-based Propensity Estimation for Counterfactual Learning to Rank

no code implementations25 May 2020 Ali Vardasbi, Maarten de Rijke, Ilya Markov

Unbiased CLTR requires click propensities to compensate for the difference between user clicks and true relevance of search results via IPS.

counterfactual Learning-To-Rank

Cannot find the paper you are looking for? You can Submit a new open access paper.