Toward Cross-Lingual Quality Classifiers for Multilingual Pretraining Data Selection

📰 ArXiv cs.AI

Learn to build cross-lingual quality classifiers for multilingual pretraining data selection to improve LLMs

advanced Published 23 Apr 2026
Action Steps
  1. Investigate cross-lingual consistency of quality markers in embedding space
  2. Collect and preprocess multilingual datasets
  3. Train a quality classifier on a high-resource language
  4. Apply the trained classifier to low-resource languages
  5. Evaluate the performance of the cross-lingual classifier
Who Needs to Know This

NLP engineers and researchers can benefit from this technique to optimize their pretraining data and improve the performance of their LLMs

Key Insight

💡 Quality markers in embedding space can show cross-lingual consistency, enabling high-resource languages to subsidize filtering of low-resource languages

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🚀 Improve LLMs with cross-lingual quality classifiers for multilingual pretraining data selection! 📊

Key Takeaways

Learn to build cross-lingual quality classifiers for multilingual pretraining data selection to improve LLMs

Full Article

Title: Toward Cross-Lingual Quality Classifiers for Multilingual Pretraining Data Selection

Abstract:
arXiv:2604.20549v1 Announce Type: cross Abstract: As Large Language Models (LLMs) scale, data curation has shifted from maximizing volume to optimizing the signal-to-noise ratio by performing quality filtering. However, for many languages, native high quality data is insufficient to train robust quality classifiers. This work investigates the idea that quality markers in embedding space may show cross-lingual consistency, which would allow high-resource languages to subsidize the filtering of lo
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