Nested Named Entity Recognition

Description from the archive archive 2025-07-28.

Benchmarks archive 2025-07-28

6 leaderboard tables shown for this task, 6 with rows (a “benchmark” on this site is a table with at least one row, as on /sota), ordered by row count. “Best model” is the first row in the archive's own order at snapshot; nothing is re-ranked here and metric direction is not recorded in the archive. PwC's Trend sparklines are not in the archive, so that column is omitted.

Syntology column: samples harvested from the paper's repositories and executed on synthesized fixtures; “ran” is not a correctness claim and does not order the table. A dash means no Syntology record for that paper, not a recorded non-run. Read from the graph 2026-09-24.

Libraries

Not in the archive: the export carries no per-task library table, so there is nothing to show at snapshot 2025-07-28.

Datasets archive 2025-07-28

14 datasets whose archive record lists this task, ordered by the archive's paper count.

Subtasks archive 2025-07-28

No subtask under this task in the archive's task tree.

Parent tasks archive 2025-07-28

Most implemented papers archive 2025-07-28

30 shown of 46 papers with code (81 tagged with this task in all), ordered by repositories listed in the archive, not by stars (the archive holds no stars, so PwC's “Social” and “Latest” sorts cannot be reproduced). Papers without a page here are shown as plain text.

• A Unified MRC Framework for Named Entity Recognition
  25 Oct 2019 8 repositories listed Syntology ran 2 of 5 samples · 3 unverified · 2 pointer-only (licence)
  Instead of treating the task of NER as a sequence labeling problem, we propose to formulate it as a machine reading comprehension (MRC) task.
• DiffusionNER: Boundary Diffusion for Named Entity Recognition
  22 May 2023 3 repositories listed
  In this paper, we propose DiffusionNER, which formulates the named entity recognition task as a boundary-denoising diffusion process and thus generates named entities from noisy spans.
• Nested Named Entity Recognition via Second-best Sequence Learning and Decoding
  5 Sep 2019 3 repositories listed
  When an entity name contains other names within it, the identification of all combinations of names can become difficult and expensive.
• Simple Yet Powerful: An Overlooked Architecture for Nested Named Entity Recognition
  1 Oct 2022 2 repositories listed
  Named Entity Recognition (NER) is an important task in Natural Language Processing that aims to identify text spans belonging to predefined categories.
• Structured Prediction as Translation between Augmented Natural Languages
  14 Jan 2021 2 repositories listed
  We propose a new framework, Translation between Augmented Natural Languages (TANL), to solve many structured prediction language tasks including joint entity and relation extraction, nested named entity recognition,…
• Pyramid: A Layered Model for Nested Named Entity Recognition
  1 Jul 2020 2 repositories listed
  Its hidden state at layer l represents an l-gram in the input text, which is labeled only if its corresponding text region represents a complete entity mention.
• Methods for Recognizing Nested Terms
  22 Apr 2025 1 repository listed
  In this paper, we describe our participation in the RuTermEval competition devoted to extracting nested terms.
• To be Continuous, or to be Discrete, Those are Bits of Questions
  12 Jun 2024 1 repository listed
  In this paper, we investigate the feasibility of further introducing it to the output side, aiming to allow models to output binary labels instead.
• DepNeCTI: Dependency-based Nested Compound Type Identification for Sanskrit
  14 Oct 2023 1 repository listed
  This work introduces the novel task of nested compound type identification (NeCTI), which aims to identify nested spans of a multi-component compound and decode the implicit semantic relations between them.
• Comparing and combining some popular NER approaches on Biomedical tasks
  30 May 2023 1 repository listed
  Lastly, we implement a system that learns to combine the predictions of SEQ and SpanPred, generating systems that consistently give high recall and high F1 across all 4 datasets.
• PromptNER: Prompt Locating and Typing for Named Entity Recognition
  26 May 2023 1 repository listed
  Prompt learning is a new paradigm for utilizing pre-trained language models and has achieved great success in many tasks.
• End-to-End Entity Detection with Proposer and Regressor
  19 Oct 2022 1 repository listed
  Named entity recognition is a traditional task in natural language processing.
• Type-supervised sequence labeling based on the heterogeneous star graph for named entity recognition
  19 Oct 2022 1 repository listed
  Named entity recognition is a fundamental task in natural language processing, identifying the span and category of entities in unstructured texts.
• Optimizing Bi-Encoder for Named Entity Recognition via Contrastive Learning
  30 Aug 2022 1 repository listed Syntology ran 4 of 4 samples · 0 unverified
  We present a bi-encoder framework for named entity recognition (NER), which applies contrastive learning to map candidate text spans and entity types into the same vector representation space.
• An Embarrassingly Easy but Strong Baseline for Nested Named Entity Recognition
  9 Aug 2022 1 repository listed
  In this paper, we propose using Convolutional Neural Network (CNN) to model these spatial relations in the score matrix.
• RuNNE-2022 Shared Task: Recognizing Nested Named Entities
  23 May 2022 1 repository listed
  In the test set the frequency of all entity types is even.
• Wojood: Nested Arabic Named Entity Corpus and Recognition using BERT
  19 May 2022 1 repository listed
  This paper presents Wojood, a corpus for Arabic nested Named Entity Recognition (NER).
• Thai Nested Named Entity Recognition Corpus
  1 May 2022 1 repository listed
  Our work, to the best of our knowledge, presents the largest non-English N-NER dataset and the first non-English one with fine-grained classes.
• Propose-and-Refine: A Two-Stage Set Prediction Network for Nested Named Entity Recognition
  27 Apr 2022 1 repository listed
  In the refine stage, proposals interact with each other, and richer contextual information is incorporated into the proposal representations.
• Boundary Smoothing for Named Entity Recognition
  26 Apr 2022 1 repository listed
  Neural named entity recognition (NER) models may easily encounter the over-confidence issue, which degrades the performance and calibration.
• BioBART: Pretraining and Evaluation of A Biomedical Generative Language Model
  8 Apr 2022 1 repository listed
  Furthermore, we conduct ablation studies on the pretraining tasks for BioBART and find that sentence permutation has negative effects on downstream tasks.
• Automatic Extraction of Nested Entities in Clinical Referrals in Spanish
  7 Apr 2022 1 repository listed
  The annotated corpus, clinical word embeddings, annotation guidelines, and neural models are freely released to the community.
• Parallel Instance Query Network for Named Entity Recognition
  20 Mar 2022 1 repository listed
  Each instance query predicts one entity, and by feeding all instance queries simultaneously, we can query all entities in parallel.
• Nested Named Entity Recognition as Latent Lexicalized Constituency Parsing
  9 Mar 2022 1 repository listed
  They treat nested entities as partially-observed constituency trees and propose the masked inside algorithm for partial marginalization.
• Unified Named Entity Recognition as Word-Word Relation Classification
  19 Dec 2021 1 repository listed
  So far, named entity recognition (NER) has been involved with three major types, including flat, overlapped (aka.
• Fusing Heterogeneous Factors with Triaffine Mechanism for Nested Named Entity Recognition
  14 Oct 2021 1 repository listed
  To fuse these heterogeneous factors, we propose a novel triaffine mechanism including triaffine attention and scoring.
• Bottom-Up Constituency Parsing and Nested Named Entity Recognition with Pointer Networks
  11 Oct 2021 1 repository listed
  Constituency parsing and nested named entity recognition (NER) are similar tasks since they both aim to predict a collection of nested and non-crossing spans.
• Nested Named Entity Recognition via Explicitly Excluding the Influence of the Best Path
  1 Aug 2021 1 repository listed
  This paper presents a novel method for nested named entity recognition.
• A Unified Generative Framework for Various NER Subtasks
  2 Jun 2021 1 repository listed
  To that end, we propose to formulate the NER subtasks as an entity span sequence generation task, which can be solved by a unified sequence-to-sequence (Seq2Seq) framework.
• A Sequence-to-Set Network for Nested Named Entity Recognition
  19 May 2021 1 repository listed Syntology ran 5 of 5 samples · 0 unverified · 5 pointer-only (licence)
  We utilize a non-autoregressive decoder to predict the final set of entities in one pass, in which we are able to capture dependencies between entities.

Syntology lines on 3 of the papers shown; no Syntology record for the others (a paper without an arXiv id cannot be joined to the graph, and absence from the graph layer is not a recorded non-run). “Ran” means the sample executed on a synthesized fixture, not that the paper's result was reproduced. Read from the graph 2026-09-24.