Variance Control via Weight Rescaling in LLM Pre-training

Louis Owen, Abhay kumar, Nilabhra Roy Chowdhury, Fabian

Variance Control via Weight Rescaling in LLM Pre-training: 5 upvotes on Hugging Face Daily Papers, #27 of 39 papers on 2025-03-25. Day-by-day upvote history.

The outcome of Large Language Model (LLM) pre-training strongly depends on weight initialization and variance control strategies. Although the importance of initial variance control has been well documented in neural networks in general, the literature on initialization and management of its growth during LLM pre-training, specifically, is somewhat sparse. In this paper, we introduce the Layer Index Rescaling (LIR) weight initialization scheme, and the Target Variance Rescaling (TVR) variance control strategy. Experiments on a 1B parameter LLaMA model demonstrate that better variance management using these techniques yields substantial improvements in downstream task performance (up to 4.6% on common pre-training benchmarks) and reduces extreme activation values, thus mitigating challenges associated with quantization and low-precision training. Our code is available at: https://github.com/bluorion-com/weight_rescaling.

Paper page on Hugging Face · arXiv

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