Papers › T-Projection: High Quality Annotation Projection for Sequence Labeling Tasks
T-Projection: High Quality Annotation Projection for Sequence Labeling Tasks
Iker García-Ferrero, Rodrigo Agerri, German Rigau
In the absence of readily available labeled data for a given sequence labeling task and language, annotation projection has been proposed as one of the possible strategies to automatically generate annotated data. Annotation projection has often been formulated as the task of transporting, on parallel corpora, the labels pertaining to a given span in the source language into its corresponding span in the target language. In this paper we present T-Projection, a novel approach for annotation projection that leverages large pretrained text-to-text language models and state-of-the-art machine translation technology. T-Projection decomposes the label projection task into two subtasks: (i) A candidate generation step, in which a set of projection candidates using a multilingual T5 model is generated and, (ii) a candidate selection step, in which the generated candidates are ranked based on translation probabilities. We conducted experiments on intrinsic and extrinsic tasks in 5 Indo-European and 8 low-resource African languages. We demostrate that T-projection outperforms previous annotation projection methods by a wide margin. We believe that T-Projection can help to automatically alleviate the lack of high-quality training data for sequence labeling tasks. Code and data are publicly available.
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Code
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Tasks
Results from the paper archive 2025-07-28
| Task | Dataset | Model | Metric | Value | Rank at snapshot | Leaderboard | Report |
|---|---|---|---|---|---|---|---|
| Cross-Lingual NER | MasakhaNER2.0 | T-Projection | Chichewa | 77.8 | #2 of 2 | Archive leaderboard | report |
| Cross-Lingual NER | MasakhaNER2.0 | T-Projection | Hausa | 72.7 | #2 of 2 | Archive leaderboard | report |
| Cross-Lingual NER | MasakhaNER2.0 | T-Projection | Igbo | 71.6 | #2 of 2 | Archive leaderboard | report |
| Cross-Lingual NER | MasakhaNER2.0 | T-Projection | Kiswahili | 84.5 | #2 of 2 | Archive leaderboard | report |
| Cross-Lingual NER | MasakhaNER2.0 | T-Projection | Yoruba | 42.7 | #2 of 2 | Archive leaderboard | report |
| Cross-Lingual NER | MasakhaNER2.0 | T-Projection | chiShona | 74.9 | #2 of 2 | Archive leaderboard | report |
| Cross-Lingual NER | MasakhaNER2.0 | T-Projection | isiXhosa | 72.3 | #2 of 2 | Archive leaderboard | report |
| Cross-Lingual NER | MasakhaNER2.0 | T-Projection | isiZulu | 66.7 | #2 of 2 | Archive leaderboard | report |
Ranks are positions in the archive's leaderboards as they stood at the 2025-07-28 snapshot. Results published since then are not among these rows, so a rank here is not a current standing.
Methods
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