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arXiv · 2008.11643

HydaLearn: Highly Dynamic Task Weighting for Multi-task Learning with Auxiliary Tasks

Sam Verboven·Muhammad Hafeez Chaudhary·Jeroen Berrevoets·Wouter Verbeke
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Abstract

Multi-task learning (MTL) can improve performance on a task by sharing representations with one or more related auxiliary-tasks. Usually, MTL-networks are trained on a composite loss function formed by a constant weighted combination of the separate task losses. In practice, constant loss weights lead to poor results for two reasons: (i) the relevance of the auxiliary tasks can gradually drift throughout the learning process; (ii) for mini-batch based optimisation, the optimal task weights vary significantly from one update to the next depending on mini-batch sample composition. We introduce HydaLearn, an intelligent weighting algorithm that connects main-task gain to the individual task gradients, in order to inform dynamic loss weighting at the mini-batch level, addressing i and ii. Using HydaLearn, we report performance increases on synthetic data, as well as on two supervised learning domains.

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Sam Verboven, Muhammad Hafeez Chaudhary, Jeroen Berrevoets, Wouter Verbeke. 2020-08-26. HydaLearn: Highly Dynamic Task Weighting for Multi-task Learning with Auxiliary Tasks. https://arxiv.org/abs/2008.11643

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