Soup-of-Experts: Pretraining Specialist Models via Parameters Averaging

• URL: http://arxiv.org/abs/2502.01804v1
• Date: Mon, 03 Feb 2025 20:33:20 GMT
• Title: Soup-of-Experts: Pretraining Specialist Models via Parameters Averaging
• Authors: Pierre Ablin, Angelos Katharopoulos, Skyler Seto, David Grangier,
• Abstract summary: Soup-of-Experts can instantiate a model at test time for any domain weights with minimal computational cost and without re-training the model.<n>We demonstrate how our approach obtains small specialized models on several language modeling tasks quickly.
• Score: 23.44999968321367
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Machine learning models are routinely trained on a mixture of different data domains. Different domain weights yield very different downstream performances. We propose the Soup-of-Experts, a novel architecture that can instantiate a model at test time for any domain weights with minimal computational cost and without re-training the model. Our architecture consists of a bank of expert parameters, which are linearly combined to instantiate one model. We learn the linear combination coefficients as a function of the input domain weights. To train this architecture, we sample random domain weights, instantiate the corresponding model, and backprop through one batch of data sampled with these domain weights. We demonstrate how our approach obtains small specialized models on several language modeling tasks quickly. Soup-of-Experts are particularly appealing when one needs to ship many different specialist models quickly under a model size constraint.

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