Orestis Papakyriakopoulos
Author directory2026
INCLUDE-2.0: Disentangling Knowledge Gaps in Multilingual LLM Evaluation
Angelika Romanou | María Grandury | Clara Meister | Negar Foroutan | Jabez Magomere | Anna Sotnikova | Hitesh Laxmichand Patel | Akshay Kumar Dubey | Alfonso Amayuelas | Amit Agarwal | Arion Das | Carlos Arriaga | Cheng Yu | Dalia Ali | David Quispe-Castillo | Fenal Ashokbhai Ilasariya | Francisco-Javier Rodrigo-Ginés | Gonzalo Martínez | Gouthami Vadithya | Guido Ivetta | Javier Conde | Jorge Vallego | Juan J. Calderón G. | Karan Gupta | Marcos J Gomez | Marvin M. Agüero-Torales | Mithil Bangera | Naira Paola Arnez Jordan | Oscar M. Cumbicus-Pineda | Priyaranjan Pattnayak | Reewos Erwin Talla Chumpitaz | Sahil Aggarwal | Sahil Raj | Shruti Jalan | Srikant Panda | Susana Zhou | Yeshil Bangera | Orestis Papakyriakopoulos | Scott A. Hale | Shamsuddeen Hassan Muhammad | Antoine Bosselut
Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing
Angelika Romanou | María Grandury | Clara Meister | Negar Foroutan | Jabez Magomere | Anna Sotnikova | Hitesh Laxmichand Patel | Akshay Kumar Dubey | Alfonso Amayuelas | Amit Agarwal | Arion Das | Carlos Arriaga | Cheng Yu | Dalia Ali | David Quispe-Castillo | Fenal Ashokbhai Ilasariya | Francisco-Javier Rodrigo-Ginés | Gonzalo Martínez | Gouthami Vadithya | Guido Ivetta | Javier Conde | Jorge Vallego | Juan J. Calderón G. | Karan Gupta | Marcos J Gomez | Marvin M. Agüero-Torales | Mithil Bangera | Naira Paola Arnez Jordan | Oscar M. Cumbicus-Pineda | Priyaranjan Pattnayak | Reewos Erwin Talla Chumpitaz | Sahil Aggarwal | Sahil Raj | Shruti Jalan | Srikant Panda | Susana Zhou | Yeshil Bangera | Orestis Papakyriakopoulos | Scott A. Hale | Shamsuddeen Hassan Muhammad | Antoine Bosselut
Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing
Current multilingual benchmarks cover only a fraction of the languages represented in modern pretraining corpora and often conflate language proficiency with the ability to answer questions grounded in specific regions and communities. We introduce INCLUDE-2.0, a large-scale benchmark for region-aware multilingual factual evaluation, which covers 91 languages from 86 countries (127 total language–country pairs), comprising over 220K curated samples drawn from native regional sources. Unlike existing benchmarks that often treat language as a proxy for region, IINCLUDE-2.0 distinguishes between questions whose answers are independent of context, vary by country, concern widely documented facts about a place, or depend on knowledge primarily expressed through local linguistic and cultural sources. Each item is annotated with its regional knowledge type and domain, and paired with an English translation, enabling controlled analysis of the relationship between language proficiency and possession of regional knowledge.
Evaluating frontier and open-weight models on IINCLUDE-2.0, we find that aggregate multilingual accuracy masks substantial variation across regional knowledge types, languages, and regions. We find that frontier models perform worse on locally embedded knowledge than on widely documented facts about regions, with an average drop of ~14.5 points. We also show that for open-weight models, scale improves accuracy but does not reliably make performance invariant to whether a question is asked in English or its original language. INCLUDE-2.0 is available at https://huggingface.co/datasets/epfl-nlp/include-2.0
Evaluating frontier and open-weight models on IINCLUDE-2.0, we find that aggregate multilingual accuracy masks substantial variation across regional knowledge types, languages, and regions. We find that frontier models perform worse on locally embedded knowledge than on widely documented facts about regions, with an average drop of ~14.5 points. We also show that for open-weight models, scale improves accuracy but does not reliably make performance invariant to whether a question is asked in English or its original language. INCLUDE-2.0 is available at https://huggingface.co/datasets/epfl-nlp/include-2.0
2024
Resampled Datasets Are Not Enough: Mitigating Societal Bias Beyond Single Attributes
Yusuke Hirota | Jerone Andrews | Dora Zhao | Orestis Papakyriakopoulos | Apostolos Modas | Yuta Nakashima | Alice Xiang
Proceedings of the 2024 Conference on Empirical Methods in Natural Language Processing
Yusuke Hirota | Jerone Andrews | Dora Zhao | Orestis Papakyriakopoulos | Apostolos Modas | Yuta Nakashima | Alice Xiang
Proceedings of the 2024 Conference on Empirical Methods in Natural Language Processing
We tackle societal bias in image-text datasets by removing spurious correlations between protected groups and image attributes. Traditional methods only target labeled attributes, ignoring biases from unlabeled ones. Using text-guided inpainting models, our approach ensures protected group independence from all attributes and mitigates inpainting biases through data filtering. Evaluations on multi-label image classification and image captioning tasks show our method effectively reduces bias without compromising performance across various models. Specifically, we achieve an average societal bias reduction of 46.1% in leakage-based bias metrics for multi-label classification and 74.8% for image captioning.
2020
NLP-based Feature Extraction for the Detection of COVID-19 Misinformation Videos on YouTube
Juan Carlos Medina Serrano | Orestis Papakyriakopoulos | Simon Hegelich
Proceedings of the 1st Workshop on NLP for COVID-19 at ACL 2020
Juan Carlos Medina Serrano | Orestis Papakyriakopoulos | Simon Hegelich
Proceedings of the 1st Workshop on NLP for COVID-19 at ACL 2020
We present a simple NLP methodology for detecting COVID-19 misinformation videos on YouTube by leveraging user comments. We use transfer learning pre-trained models to generate a multi-label classifier that can categorize conspiratorial content. We use the percentage of misinformation comments on each video as a new feature for video classification.
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Co-authors
- Amit Agarwal 1
- Sahil Aggarwal 1
- Marvin Agüero-Torales 1
- Dalia Ali 1
- Alfonso Amayuelas 1
- Jerone Andrews 1
- Carlos Arriaga 1
- Mithil Bangera 1
- Yeshil Bangera 1
- Antoine Bosselut 1
- Reewos Erwin Talla Chumpitaz 1
- Javier Conde 1
- Oscar M. Cumbicus-Pineda 1
- Arion Das 1
- Akshay Kumar Dubey 1
- Negar Foroutan 1
- Juan J. Calderón G. 1
- Marcos J Gomez 1
- María Grandury 1
- Karan Gupta 1
- Scott A. Hale 1
- Simon Hegelich 1
- Yusuke Hirota 1
- Fenal Ashokbhai Ilasariya 1
- Guido Ivetta 1
- Shruti Jalan 1
- Naira Paola Arnez Jordan 1
- Jabez Magomere 1
- Gonzalo Martínez 1
- Juan Carlos Medina Serrano 1
- Clara Meister 1
- Apostolos Modas 1
- Shamsuddeen Hassan Muhammad 1
- Yuta Nakashima 1
- Srikant Panda 1
- Hitesh Laxmichand Patel 1
- Priyaranjan Pattnayak 1
- David Quispe-Castillo 1
- Sahil Raj 1
- Francisco-Javier Rodrigo-Ginés 1
- Angelika Romanou 1
- Anna Sotnikova 1
- Gouthami Vadithya 1
- Jorge Vallego 1
- Alice Xiang 1
- Cheng Yu 1
- Dora Zhao 1
- Susana Zhou 1