Multilingual transformer models like mBERT and XLM-RoBERTa have obtained great improvements for many NLP tasks on a variety of languages. However, recent works also showed that results from high-resource languages could not be easily transferred to realistic, low-resource scenarios. In this work, we study trends in performance for different amounts of available resources for the three African languages Hausa, isiXhosa and Yor\`ub\'a on both NER and topic classification. We show that in combination with transfer learning or distant supervision, these models can achieve with as little as 10 or 100 labeled sentences the same performance as baselines with much more supervised training data. However, we also find settings where this does not hold. Our discussions and additional experiments on assumptions such as time and hardware restrictions highlight challenges and opportunities in low-resource learning.

研究了不同数量可用资源的情况下，对三种非洲语言 Hausa，isiXhosa 和 Yoruba 进行 NER 和主题分类的表现趋势，并通过远距离监督和迁移学习等方法，使用少量的标注数据达到与基线相同的性能，揭示了低资源学习中存在的挑战和机会。

多语言Transformer模型的远程监督和迁移学习：关于非洲语言的研究