Challenge: Neural named entity recognition (BioNER) methods require large amount of annotated data, while the annotating BioNER datasets are often difficult to obtain and small in scale due to the limitations of privacy, ethics and high degree of specialization.
Approach: They propose a method that utilizes latent multi-granularity information in annotated bioNER datasets to alleviate the lack of training samples.
Outcome: The proposed model improves over the BioBERT baseline and can get more than 3% improvement of F1score in low-resource scenarios.

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Multi-grained Named Entity Recognition (P19-1)

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Challenge: Existing approaches treat Named Entity Recognition (NER) as a sequence labeling task.
Approach: They propose a framework for Multi-Grained Named Entity Recognition where multiple entities or entity mentions in a sentence could be non-overlapping or totally nested.
Outcome: The proposed framework outperforms current state-of-the-art frameworks by 4.4% in terms of the F1 score among nested/non-overlapping NER tasks.
OpenBioNER: Lightweight Open-Domain Biomedical Named Entity Recognition Through Entity Type Description (2025.findings-naacl)

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Challenge: Biomedical Named Entity Recognition (BioNER) is a computationally expensive and limited tool . specialized 7B NER LLMs and GPT-4o can't match textual spans with entity types .
Approach: They propose a lightweight BERT-based cross-encoder architecture that can identify any biomedical entity using only its description.
Outcome: The proposed system outperforms existing models that match textual spans with entity types rather than descriptions on biomedical benchmarks.
Granular Entity Mapper: Advancing Fine-grained Multimodal Named Entity Recognition and Grounding (2024.findings-emnlp)

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Challenge: Existing methods for fine-grained content extraction are limited by long-tailed distribution of textual entity categories and performance of object detectors.
Approach: They propose a multi-granularity entity recognition module and a reranking module to integrate hierarchical information of entity categories, visual cues, and external textual resources collectively.
Outcome: The proposed framework achieves state-of-the-art on the fine-grained content extraction task.
Exploiting Entity BIO Tag Embeddings and Multi-task Learning for Relation Extraction with Imbalanced Data (P19-1)

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Challenge: Existing methods to perform relation extraction are feature-based or kernel-based, but the results of our study show that they can improve the performance of a baseline model with more than 10% absolute increase in F1-score.
Approach: They propose a multi-task architecture which jointly trains a model to perform relation identification with cross-entropy loss and relation classification with ranking loss.
Outcome: The proposed model outperforms the state-of-the-art models on ACE 2005 Chinese and English corpus and significantly improves the performance of a baseline model with more than 10% increase in F1-score.
Improve Neural Entity Recognition via Multi-Task Data Selection and Constrained Decoding (N18-2)

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Challenge: Entity recognition is a widely benchmarked task in natural language processing . a neural architecture called BiLSTM-CRF is used to model the language sequences .
Approach: They propose a neural architecture called BiLSTM-CRF to model the language sequences.
Outcome: The proposed system achieves state-of-the-art on English entity recognition task and also in other languages.
Hardness-guided domain adaptation to recognise biomedical named entities under low-resource scenarios (2022.emnlp-main)

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Challenge: Named Entity Recognition (NER) tasks require a large amount of training data and domains are often scarcely labeled.
Approach: They propose a hardness-guided domain adaptation framework for bioNER tasks that leverages domain hardness information to improve the adaptability of the learnt model in low-resource scenarios.
Outcome: The proposed model outperforms the state-of-the-art MetaNER model on biomedical datasets.
Recognizing Complex Entity Mentions: A Review and Future Directions (P18-3)

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Challenge: Named entity recognition (NER) is a task of identifying and classifying named entities (NE) within text.
Approach: They review existing methods for identifying and classifying named entities within text . they identify the research gap and propose a new approach to tackle these problems .
Outcome: The proposed methods address the identified identified gaps in the literature and provide recommendations for future work.
Deep Exhaustive Model for Nested Named Entity Recognition (D18-1)

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Challenge: Named entity recognition (NER) is a task of finding entities with specific semantic types such as Protein, Cell, and RNA in text.
Approach: They propose a deep neural model for nested named entity recognition . they enumerate all possible regions or spans as potential entity mentions .
Outcome: The proposed model outperforms state-of-the-art models on nested and flat NER . it achieves 77.1% and 78.4% respectively in terms of F-score, without external knowledge resources.
Weakly Supervised Attention Networks for Entity Recognition (D19-1)

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Challenge: Existing approaches to entity recognition require large amounts of token-level data, which can be expensive and cumbersome to obtain.
Approach: They propose a weakly supervised model that can be annotated at word level from a corpus containing binary presence/absence labels.
Outcome: The proposed model performs reasonably well on the task of entity recognition despite not having access to token-level ground truth data.
MultiNERD: A Multilingual, Multi-Genre and Fine-Grained Dataset for Named Entity Recognition (and Disambiguation) (2022.findings-naacl)

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Challenge: Named Entity Recognition (NER) is a process of identifying named entities in unstructured texts and classifying them through specific semantic categories.
Approach: They propose a method for automatically producing NER annotations and introduce a manually-annotated test set.
Outcome: The proposed method covers 10 languages, 15 NER categories and 2 textual genres and a manually-annotated test set.

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