In this paper, we consider the framework of multi-task representation (MTR)
learning where the goal is to use source tasks to learn a representation that
reduces the sample complexity of solving a target task. We start by reviewing
recent advances in MTR theory and show that they can provide novel insights for
popular meta-learning algorithms when analyzed within this framework. In
particular, we highlight a fundamental difference between gradient-based and
metric-based algorithms in practice and put forward a theoretical analysis to
explain it. Finally, we use the derived insights to improve the performance of
meta-learning methods via a new spectral-based regularization term and confirm
its efficiency through experimental studies on few-shot classification
benchmarks. To the best of our knowledge, this is the first contribution that
puts the most recent learning bounds of MTR theory into practice for the task
of few-shot classification.

本文考虑多任务表示学习的框架，总结最近的研究进展，指出基于梯度和基于度量的算法在实践中的根本差异并通过新的基于光谱的正则项改进元学习方法进行实验，以实现 few-shot 分类任务。