Vladimir Ivanov


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Medical Crossing: a Cross-lingual Evaluation of Clinical Entity Linking
Anton Alekseev | Zulfat Miftahutdinov | Elena Tutubalina | Artem Shelmanov | Vladimir Ivanov | Vladimir Kokh | Alexander Nesterov | Manvel Avetisian | Andrei Chertok | Sergey Nikolenko
Proceedings of the Thirteenth Language Resources and Evaluation Conference

Medical data annotation requires highly qualified expertise. Despite the efforts devoted to medical entity linking in different languages, available data is very sparse in terms of both data volume and languages. In this work, we establish benchmarks for cross-lingual medical entity linking using clinical reports, clinical guidelines, and medical research papers. We present a test set filtering procedure designed to analyze the “hard cases” of entity linking approaching zero-shot cross-lingual transfer learning, evaluate state-of-the-art models, and draw several interesting conclusions based on our evaluation results.

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Entity Linking over Nested Named Entities for Russian
Natalia Loukachevitch | Pavel Braslavski | Vladimir Ivanov | Tatiana Batura | Suresh Manandhar | Artem Shelmanov | Elena Tutubalina
Proceedings of the Thirteenth Language Resources and Evaluation Conference

In this paper, we describe entity linking annotation over nested named entities in the recently released Russian NEREL dataset for information extraction. The NEREL collection is currently the largest Russian dataset annotated with entities and relations. It includes 933 news texts with annotation of 29 entity types and 49 relation types. The paper describes the main design principles behind NEREL’s entity linking annotation, provides its statistics, and reports evaluation results for several entity linking baselines. To date, 38,152 entity mentions in 933 documents are linked to Wikidata. The NEREL dataset is publicly available.

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NamedEntityRangers at SemEval-2022 Task 11: Transformer-based Approaches for Multilingual Complex Named Entity Recognition
Amina Miftahova | Alexander Pugachev | Artem Skiba | Katya Artemova | Tatiana Batura | Pavel Braslavski | Vladimir Ivanov
Proceedings of the 16th International Workshop on Semantic Evaluation (SemEval-2022)

This paper presents the two submissions of NamedEntityRangers Team to the MultiCoNER Shared Task, hosted at SemEval-2022. We evaluate two state-of-the-art approaches, of which both utilize pre-trained multi-lingual language models differently. The first approach follows the token classification schema, in which each token is assigned with a tag. The second approach follows a recent template-free paradigm, in which an encoder-decoder model translates the input sequence of words to a special output, encoding named entities with predefined labels. We utilize RemBERT and mT5 as backbone models for these two approaches, respectively. Our results show that the oldie but goodie token classification outperforms the template-free method by a wide margin. Our code is available at: https://github.com/Abiks/MultiCoNER.


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NEREL: A Russian Dataset with Nested Named Entities, Relations and Events
Natalia Loukachevitch | Ekaterina Artemova | Tatiana Batura | Pavel Braslavski | Ilia Denisov | Vladimir Ivanov | Suresh Manandhar | Alexander Pugachev | Elena Tutubalina
Proceedings of the International Conference on Recent Advances in Natural Language Processing (RANLP 2021)

In this paper, we present NEREL, a Russian dataset for named entity recognition and relation extraction. NEREL is significantly larger than existing Russian datasets: to date it contains 56K annotated named entities and 39K annotated relations. Its important difference from previous datasets is annotation of nested named entities, as well as relations within nested entities and at the discourse level. NEREL can facilitate development of novel models that can extract relations between nested named entities, as well as relations on both sentence and document levels. NEREL also contains the annotation of events involving named entities and their roles in the events. The NEREL collection is available via https://github.com/nerel-ds/NEREL.


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Inno at SemEval-2020 Task 11: Leveraging Pure Transfomer for Multi-Class Propaganda Detection
Dmitry Grigorev | Vladimir Ivanov
Proceedings of the Fourteenth Workshop on Semantic Evaluation

The paper presents the solution of team ”Inno” to a SEMEVAL 2020 task 11 ”Detection of propaganda techniques in news articles”. The goal of the second subtask is to classify textual segments that correspond to one of the 18 given propaganda techniques in news articles dataset. We tested a pure Transformer-based model with an optimized learning scheme on the ability to distinguish propaganda techniques between each other. Our model showed 0:6 and 0:58 overall F1 score on validation set and test set accordingly and non-zero F1 score on each class on both sets.


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Unsupervised Approach to Extracting Problem Phrases from User Reviews of Products
Elena Tutubalina | Vladimir Ivanov
Proceedings of the First AHA!-Workshop on Information Discovery in Text