Datasets:
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pretty_name: Document-Level Word Alignment
license: other
license_name: mixed-per-subset
license_link: LICENSE.md
language:
- en
- fr
- ro
- ja
- zh
- gr
- la
- cs
multilinguality: multilingual
task_categories:
- token-classification
task_ids: []
size_categories:
- 1K<n<10K
configs:
- config_name: en-fr
data_files:
- split: dev
path: documents/en-fr/dev.json
- split: test
path: documents/en-fr/test.json
- config_name: en-ro
data_files:
- split: dev
path: documents/en-ro/dev.json
- split: test
path: documents/en-ro/test.json
- config_name: en-ja
data_files:
- split: dev
path: documents/en-ja/dev.json
- split: test
path: documents/en-ja/test.json
- config_name: en-zh
data_files:
- split: dev
path: documents/en-zh/dev.json
- split: test
path: documents/en-zh/test.json
- config_name: la-gr
data_files:
- split: dev
path: documents/la-gr/dev.json
- split: test
path: documents/la-gr/test.json
- config_name: en-cz
data_files:
- split: test
path: documents/en-cz/test.json
---
# Document-Level Word Alignment
Document-level word alignment data for six language pairs — English–French (en-fr), English–Romanian (en-ro), English–Japanese (en-ja), English–Chinese (en-zh), Latin–Ancient Greek (la-gr), and English–Czech (en-cz) — reconstructed from existing sentence-level, human-annotated word alignment gold standards.
Document-level examples are built by grouping sentence-level annotations by document membership and sentence order; the dataset does not contain new human annotation beyond what already exists in the source corpora (see [Sources & Licensing](#sources--licensing)).
This dataset accompanies the paper [*"Scaling Unsupervised Word Alignment to Documents with Structural Constraints"*](https://arxiv.org/abs/2608.21023).
## Dataset Structure
Each configuration corresponds to a language pair, e.g. `en-ja`. Each row is one document pair. Splits are `dev` and `test`, except `en-cz`, which is test-only.
### Data Fields
| Field | Type | Description |
|---|---|---|
| `sent_id` | string | Unique identifier for the document |
| `doc_id` | string | Identifier of the parent document |
| `lang` | string | Language pair code, e.g. `"en-ja"` |
| `text_a` | string | Source-language text (whitespace-tokenized) |
| `text_b` | string | Target-language text (whitespace-tokenized) |
| `sure_align` | string | Space-separated `i-j` sure alignment links (0-indexed word positions, `i` in `text_a`, `j` in `text_b`) |
| `possible_align` | string | Space-separated `i-j` possible alignment links |
### Example
```json
{"sent_id": "trial", "doc_id": "trial", "lang": "en-fr",
"text_a": "source document text ...", "text_b": "target document text ...",
"sure_align": "0-0 3-5", "possible_align": "1-1"}
```
### Dataset Statistics (dev / test)
| Lang pair | Docs (dev/test) | Mean doc length (chars) |
|---|---:|---:|
| en-fr | 1 / 1 | 22,408 |
| en-ro | 1 / 10 | 2,901 |
| en-ja | 8 / 7 | 5,516 |
| en-zh | 47 / 52 | 646 |
| la-gr | 1 / 1 | 5,837 |
| en-cz | — / 33 | 6,318 |
Lengths are target-side (`text_b`) character counts.
## Sources & Licensing
This is a derived/reconstructed dataset. Each language pair originates from a separate, independently licensed source.
| Lang pair | Source | License |
|---|---|---|
| en-ja | [Neubig (2011)](https://www.phontron.com/kftt) | CC BY-SA 3.0 |
| la-gr | [Yousef et al. (2022)](https://aclanthology.org/2022.lrec-1.634/) | CC BY-SA 4.0 |
| en-fr, en-ro | [Mihalcea & Pedersen (2003)](https://aclanthology.org/W03-0301/) | Not specified by the source |
| en-zh | [Liu and Sun (2015)](https://nlp.csai.tsinghua.edu.cn/~ly/systems/TsinghuaAligner/TsinghuaAligner.html) | Not specified by the source |
| en-cz | [Mareček (2011)](https://ufal.mff.cuni.cz/czech-english-manual-word-alignment) | CC BY-SA 4.0 |
## Dataset Creation
Document-level examples were constructed by concatenating sentence-level source/target texts within a document in their original order and re-indexing `sure_align`/`possible_align` accordingly.
## Citation
If you use this dataset, please cite both this work and the original source(s) listed in [Sources & Licensing](#sources--licensing) for the language pair(s) you use.
```bibtex
@misc{wastl2026scalingunsupervisedwordalignment,
title={Scaling Unsupervised Word Alignment to Documents via Structural Constraints},
author={Michelle Wastl and Jannis Vamvas and Rico Sennrich},
year={2026},
eprint={2608.21023},
archivePrefix={arXiv},
primaryClass={cs.CL},
url={https://arxiv.org/abs/2608.21023},
}
```
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