# Nested Named Entity Recognition on ACE 8:1:1 2004 (test)

Source: [Nested Named Entity Recognition on ACE 8:1:1 2004 (test)](<https://www.sota2.com/research/sota/nested-named-entity-recognition-on-ace-8-1-1-2004-test>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2026-02-26T05:43:06.987Z

Evaluation of Nested Named Entity Recognition performance on the test split of the ACE 8:1:1 2004 dataset.

A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage.

| Scope | Recorded value |
| --- | --- |
| Task | Nested Named Entity Recognition |
| Dataset (including any stated split) | ACE 8:1:1 2004 (test) |
| Metric | F1 Score |
| Unit | PERCENT |
| Direction | Higher is better |
| Results loaded | 6 of 6 |
| Coverage | All results currently returned for this benchmark |

Evaluation settings may differ between results. The original papers and recorded configurations are needed to establish comparability. A shared metric name alone does not establish an identical protocol.

## Metrics

- [F1 Score](<https://www.sota2.com/research/sota/nested-named-entity-recognition-on-ace-8-1-1-2004-test.md?metric=F1%20Score>): Higher is better; unit: PERCENT.

- [Precision](<https://www.sota2.com/research/sota/nested-named-entity-recognition-on-ace-8-1-1-2004-test.md?metric=Precision>): Higher is better; unit: PERCENT.

- [Recall](<https://www.sota2.com/research/sota/nested-named-entity-recognition-on-ace-8-1-1-2004-test.md?metric=Recall>): Higher is better; unit: PERCENT.

## Recorded results

| Method | F1 Score | Result date | Report paper |
| --- | --- | --- | --- |
| Sequence-to-Set Network | 87.26 | Not recorded | 68fa6a3d1e209131cea26e3c |
| Yu et al. | 86.7 | Not recorded | 68fa6a3d1e209131cea26e3c |
| Jue et al. | 86.28 | Not recorded | 68fa6a3d1e209131cea26e3c |
| Straková et al. | 84.4 | Not recorded | 68fa6a3d1e209131cea26e3c |
| Shibuya and Hovy | 82.81 | Not recorded | 68fa6a3d1e209131cea26e3c |
| Katiyar and Cardie | 72.7 | Not recorded | 68fa6a3d1e209131cea26e3c |

### Sequence-to-Set Network

F1 Score: 87.26. Result ID: 698e2183ffc3901de09b0794.

[Reporting paper](<https://www.sota2.com/research/paper/68fa6a3d1e209131cea26e3c.md>)

[Method origin paper](<https://www.sota2.com/research/paper/68fa6a3d1e209131cea26e3c.md>)

[Implementation](<https://github.com/zqtan1024/sequence-to-set>)

Recorded evaluation configuration: {"backbone":"BERT-Large"}. This record does not assert independent reproduction.

### Yu et al.

F1 Score: 86.7. Result ID: 698e2183ffc3901de09b0793.

[Reporting paper](<https://www.sota2.com/research/paper/68fa6a3d1e209131cea26e3c.md>)

[Method origin paper](<https://www.sota2.com/research/paper/68fa67bb1e209131cea182b4.md>)

[Implementation](<https://github.com/juntaoy/biaffine-ner>)

Recorded evaluation configuration: {"year":"2020","backbone":"BERT-Large"}. This record does not assert independent reproduction.

### Jue et al.

F1 Score: 86.28. Result ID: 698e2183ffc3901de09b0792.

[Reporting paper](<https://www.sota2.com/research/paper/68fa6a3d1e209131cea26e3c.md>)

Recorded evaluation configuration: {"year":"2020","backbone":"BERT-Large"}. This record does not assert independent reproduction.

### Straková et al.

F1 Score: 84.4. Result ID: 698e2183ffc3901de09b0791.

[Reporting paper](<https://www.sota2.com/research/paper/68fa6a3d1e209131cea26e3c.md>)

[Method origin paper](<https://www.sota2.com/research/paper/68fa66361e209131cea0ecfe.md>)

Recorded evaluation configuration: {"year":"2019"}. This record does not assert independent reproduction.

### Shibuya and Hovy

F1 Score: 82.81. Result ID: 698e2183ffc3901de09b0790.

[Reporting paper](<https://www.sota2.com/research/paper/68fa6a3d1e209131cea26e3c.md>)

[Method origin paper](<https://www.sota2.com/research/paper/68fa67e41e209131cea18e9c.md>)

[Implementation](<https://github.com/yahshibu/nested-ner-tacl2020>)

Recorded evaluation configuration: {"year":"2019"}. This record does not assert independent reproduction.

### Katiyar and Cardie

F1 Score: 72.7. Result ID: 698e2183ffc3901de09b078f.

[Reporting paper](<https://www.sota2.com/research/paper/68fa6a3d1e209131cea26e3c.md>)

Recorded evaluation configuration: {"year":"2018"}. This record does not assert independent reproduction.

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