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Kaifeng Lyu

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#natural language process... Preprint Oct 2026

WavePrune: One period is often enough for RoPE

Rotary Position Embedding (RoPE) encodes token positions by rotating each two-dimensional channel of the query and key vectors at a channel-specific frequency, making the attention logits invariant to a common shift of positions. However, this rotation is periodic, and it leads to position aliasing where relative posit...

Guan-Cheng Du, Luo-Tian Huang, Shao-Wen Wang et al. · 0 citations
Preprint Aug 2026

Puro-2B: Poor Lab's Qwen2-1.5B Trained on RTX 5090 within $5090

Language model pretraining has become almost synonymous with prohibitive cost, placing it out of reach for much of the academic and open-source communities. Although strong open-source efforts already exist, including open-weight models and open-source training recipes, a cost-efficient, hardware-accessible, and open-s...

Kai-Rong Luo, Jia-Rui Cui, Yao-Rui Yin et al. · 0 citations
#natural language process... Preprint Aug 2026

Puro-2B: Poor Lab's Qwen2-1.5B Trained on RTX 5090 within $5090

This report presents an open pretraining recipe that trains a collection of Puro-2B models from scratch on up to 1.4 trillion tokens with FP8 precision on consumer-grade RTX 5090 GPUs, and derives a Puro Cost Scaling Law that relates training cost to average model performance.

Kairong Luo, Jia-Rui Cui, Yao-Rui Yin et al. · 0 citations
Preprint Jul 2026

Frontier Language Models Struggle to Copy: Text Can Be Better Viewed in 2D

2D-RoPE is introduced, which organizes text into a 2D grid rather than a 1D sequence and assigns each token a row ID and a column ID, and suggests that viewing text in 2D can benefit language modeling.

Haodong Wen, Yiran Zhang, Yingfa Chen et al. · 0 citations

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