A key challenge in many applications of multisource transfer learning is to explicitly capture the diverse source–target similarities. In this article, we are concerned with stretching the set of practical… Click to show full abstract
A key challenge in many applications of multisource transfer learning is to explicitly capture the diverse source–target similarities. In this article, we are concerned with stretching the set of practical approaches based on Gaussian process (GP) models to solve multisource transfer regression problems. Precisely, we first investigate the feasibility and performance of a family of transfer covariance functions that represent the pairwise similarity of each source and the target domain. We theoretically show that using such a transfer covariance function for general GP modeling can only capture the same similarity coefficient for all the sources, and thus may result in unsatisfactory transfer performance. This outcome, together with the scalability issues of a single GP based approach, leads us to propose
               
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