Adapting English Quality Classifiers for Multilingual LLM Pretraining Data Selection
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Computer Science > Computation and Language
arXiv:2610.11585 (cs)
[Submitted on 8 Oct 2026]
Title:Adapting English Quality Classifiers for Multilingual LLM Pretraining Data Selection
View a PDF of the paper titled Adapting English Quality Classifiers for Multilingual LLM Pretraining Data Selection, by Vinko Sabol\v{c}ec and 3 other authors
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Abstract:Recent advances in large language model (LLM) pretraining highlight the role of high-quality training data in improving performance. While model-based filtering has proven effective in selecting high-quality subsets from web-scale corpora, especially for high-resource languages, low-resource languages face challenges due to limited availability of annotated data. This work explores extending quality filtering to over 100 languages by proposing a multilingual adaptation approach that converts an existing English quality classifier into a multilingual variant. Our approach proposes training a small multi-layer perceptron on top of Transformer encoder-only model embeddings, using multilingual text as input and scores obtained from English classifiers applied to machine-translated text as labels. Our 1B, 3B and 8B scale experiments show that our approach maintains the downstream LLM benchmark performance of existing multilingual model-based filtering baselines, without harming regional and cultural knowledge benchmarks. To further evaluate cross-lingual generalization, we compare classifier scores of high-quality synthetic data and web samples, and the correlation of classifier scores with LLM-based ones, revealing that the classifier can learn the scoring criteria of its original English variant, even for languages not included in its training data.
| Subjects: | Computation and Language (cs.CL); Artificial Intelligence (cs.AI) |
| Cite as: | arXiv:2610.11585 [cs.CL] |
| (or arXiv:2610.11585v1 [cs.CL] for this version) | |
| https://doi.org/10.48550/arXiv.2610.11585
arXiv-issued DOI via DataCite (pending registration)
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View a PDF of the paper titled Adapting English Quality Classifiers for Multilingual LLM Pretraining Data Selection, by Vinko Sabol\v{c}ec and 3 other authors
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