Layer-Parallel Training for Transformers

• URL: http://arxiv.org/abs/2601.09026v1
• Date: Tue, 13 Jan 2026 23:12:53 GMT
• Title: Layer-Parallel Training for Transformers
• Authors: Shuai Jiang, Marc Salvado, Eric C. Cyr, Alena Kopaničáková, Rolf Krause, Jacob B. Schroder,
• Abstract summary: We present a new training methodology for transformers using a multilevel, layer-parallel approach.<n>Our application of a multilevel parallel-in-time algorithm for the forward and backpropagation phases of training achieves parallel acceleration over the layer dimension.<n>We develop an algorithm to detect this critical transition and either switch to serial training or systematically increase the accuracy of layer-parallel training.
• Score: 3.799206695592991
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a new training methodology for transformers using a multilevel, layer-parallel approach. Through a neural ODE formulation of transformers, our application of a multilevel parallel-in-time algorithm for the forward and backpropagation phases of training achieves parallel acceleration over the layer dimension. This dramatically enhances parallel scalability as the network depth increases, which is particularly useful for increasingly large foundational models. However, achieving this introduces errors that cause systematic bias in the gradients, which in turn reduces convergence when closer to the minima. We develop an algorithm to detect this critical transition and either switch to serial training or systematically increase the accuracy of layer-parallel training. Results, including BERT, GPT2, ViT, and machine translation architectures, demonstrate parallel-acceleration as well as accuracy commensurate with serial pre-training while fine-tuning is unaffected.

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