Towards Combining Multitask and Multilingual Learning

Machine learning is an increasingly important approach to Natural Language Processing. Most languages however do not possess enough data to fully utilize it. When dealing with such languages it is important to use as much auxiliary data as possible. In this work we propose a combination of multitask and multilingual learning. When learning a new task we use data from other tasks and other languages at the same time. We evaluate our approach with a neural network based model that can solve two tasks - part-of-speech tagging and named entity recognition - with four different languages at the same time. Parameters of this model are partially shared across all data and partially they are specific for individual tasks and/or languages. Preliminary experiments show that this approach has its merits as we were able to beat baseline solutions that do not combine data from all the available sources.