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UCLNLP/monoweb

sourceHugging Faceupdated 5mo agoView on Hugging Face

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MonoWeb Models

Pretrained language models released alongside the paper:

[The Role of Mixed-Language Documents for Multilingual Large Language Model Pretraining](https://arxiv.org/pdf/2601.00364)

Associated dataset: UCLNLP/monoweb-dataset

Model Details

All models are decoder-only transformers with 1.35B parameters, trained from scratch using the Llama-2 tokenizer (32K vocabulary). Architecture: 24 layers, hidden dimension 2048, 16 attention heads, context length 2048. Training was performed with Megatron-LM for ~143B tokens (34K steps).

Model Variants

Models are organized by language pair and training data configuration:

Folder	Language Pair	Training Data
`ckpt_exp_en_de_baseline`	English–German	FineWeb (full corpus, including bilingual docs)
`ckpt_exp_en_de_monoweb`	English–German	MonoWeb (bilingual docs removed)
`ckpt_exp_en_de_onlyparallel`	English–German	MonoWeb + parallel docs reintroduced
`ckpt_exp_en_de_onlycodeswitch`	English–German	MonoWeb + code-switching docs reintroduced
`ckpt_exp_en_es_baseline`	English–Spanish	FineWeb (full corpus, including bilingual docs)
`ckpt_exp_en_es_monoweb`	English–Spanish	MonoWeb (bilingual docs removed)
`ckpt_exp_en_es_onlyparallel`	English–Spanish	MonoWeb + parallel docs reintroduced
`ckpt_exp_en_es_onlycodeswitch`	English–Spanish	MonoWeb + code-switching docs reintroduced
`ckpt_exp_en_fr_baseline`	English–French	FineWeb (full corpus, including bilingual docs)
`ckpt_exp_en_fr_monoweb`	English–French	MonoWeb (bilingual docs removed)
`ckpt_exp_en_fr_onlyparallel`	English–French	MonoWeb + parallel docs reintroduced
`ckpt_exp_en_fr_onlycodeswitch`	English–French	MonoWeb + code-switching docs reintroduced

Each folder contains checkpoints saved every 2,000 steps from iter_2000 to iter_36000 (18 checkpoints per model).