We study few-shot learning in natural language domains. Compared to many existing works that apply either metric-based or optimization-based meta-learning to image domain with low inter-task variance, we consider a more realistic setting, where tasks are diverse. However, it imposes tremendous difficulties to existing state-of-the-art metric-based algorithms since a single metric is insufficient to capture complex task variations in natural language domain. To alleviate the problem, we propose an adaptive metric learning approach that automatically determines the best weighted combination from a set of metrics obtained from meta-training tasks for a newly seen few-shot task. Extensive quantitative evaluations on real-world sentiment analysis and dialog intent classification datasets demonstrate that the proposed method performs favorably against state-of-the-art few shot learning algorithms in terms of predictive accuracy. We make our code and data available for further study.

提出了一种自适应度量学习方法，该方法能够从元训练任务中获得一组评估度量，并自动确定最佳加权组合，以捕捉自然语言领域中新的few-shot任务的复杂任务变化。在真实情感分析和对话意图分类数据集上进行了广泛的定量评估，结果表明所提出的方法在预测准确性方面表现优于现有的few shot learning算法。

多度量参数下的多样化小样本文本分类