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Multi-task learning (MTL) aims at boosting the overall performance of each individual task by leveraging useful information contained in multiple-related tasks. It has shown great success in natural language processing (NLP). Currently, a number of MTL architectures and learning mechanisms have been proposed for various NLP tasks, including exploring linguistic hierarchies, orthogonality constraints, adversarial learning, gate mechanism, and label embedding. However, there is no systematic exploration and comparison of different MTL architectures and learning mechanisms for their strong performance in-depth. In this paper, we conduct a thorough examination of five typical MTL methods with deep learning architectures for a broad range of representative NLP tasks. Our primary goal is to understand the merits and demerits of existing MTL methods in NLP tasks, thus devising new hybrid architectures intended to combine their strengths. Following the empirical evaluation, we offer our insights and conclusions regarding the MTL methods we have considered.

Empirical evaluation of multi-task learning in deep neural networks for natural language processing