In 1997, the journal Machine Learning published a special issue devoted to transfer learning, and by 1998, the field had advanced to include multi-task learning, along with a more formal analysis of its theoretical foundations.
1997年，机器学习期刊发表了一期专门讨论迁移学习的期刊， 而到了1998年，该领域已经发展到包括多任务学习， 以及对其理论基础的更深入完善的分析。