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Dataset Card for CA-ZH Parallel Corpus
Dataset Summary
The CA-ZH Parallel Corpus is a Catalan-Chinese dataset of 6.833.114 parallel sentences. The dataset was created to support Catalan in NLP tasks, specifically Machine Translation.
Supported Tasks and Leaderboards
The dataset can be used to train Bilingual Machine Translation models between Chinese and Catalan in any direction, as well as Multilingual Machine Translation models.
Languages
The sentences included in the dataset are in Catalan (CA) and Chinese (ZH).
Dataset Structure
Data Instances
Two separate txt files are provided with the sentences sorted in the same order:
ca-zh_all_2023_10_26.ca: contains 6.833.114 Catalan sentences.
ca-zh_all_2023_10_26.zh: contains 6.833.114 Chinese sentences.
Data Fields
[N/A]
Data Splits
The dataset contains a single split: train
.
Dataset Creation
Dataset Creation
Curation Rationale
This dataset is aimed at promoting the development of Machine Translation between Catalan and other languages, specifically Chinese.
Source Data
Initial Data Collection and Normalization
The Catalan-Chinese data collected from the web was a combination of the following datasets:
Dataset | Sentences before cleaning |
---|---|
WikiMatrix | 90.643 |
XLENT | 535.803 |
GNOME | 78 |
QED | 3.677 |
TED2020 v1 | 56.269 |
OpenSubtitles | 139.300 |
Total | 882.039 |
The 6.658.607 sentence pairs of synthetic parallel data were created from the following Spanish-Chinese datasets:
Dataset | Sentences before cleaning |
---|---|
UNPC | 17.599.223 |
CCMatrix | 24.051.233 |
MultiParacrawl | 3.410.087 |
Total | 45.060.543 |
Data preparation
The Chinese side of all datasets are passed through the fastlangid language detector and any sentences which are not identified as simplified Chinese are discarded. The datasets are then also deduplicated and filtered to remove any sentence pairs with a cosine similarity of less than 0.75. This is done using sentence embeddings calculated using LaBSE. The filtered datasets are then concatenated to form a final corpus of 6.833.114 parallel sentences.
Who are the source language producers?
Annotations
Annotation process
The dataset does not contain any annotations.
Who are the annotators?
[N/A]
Personal and Sensitive Information
Given that this dataset is partly derived from pre-existing datasets that may contain crawled data, and that no specific anonymisation process has been applied, personal and sensitive information may be present in the data. This needs to be considered when using the data for training models.
Considerations for Using the Data
Social Impact of Dataset
By providing this resource, we intend to promote the use of Catalan across NLP tasks, thereby improving the accessibility and visibility of the Catalan language.
Discussion of Biases
No specific bias mitigation strategies were applied to this dataset. Inherent biases may exist within the data.
Other Known Limitations
The dataset contains data of a general domain. Applications of this dataset in more specific domains such as biomedical, legal etc. would be of limited use.
Additional Information
Dataset Curators
Language Technologies Unit at the Barcelona Supercomputing Center (langtech@bsc.es).
This work has been promoted and financed by the Generalitat de Catalunya through the Aina project.
Licensing Information
This work is licensed under a Attribution-NonCommercial-ShareAlike 4.0 International.
Citation Information
[N/A]
Contributions
[N/A]
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