Few-shot learning is challenging for learning algorithms that learn each task in isolation and from scratch. In contrast, meta-learning learns from many related tasks a meta-learner that can learn a new task more accurately and faster with fewer examples, where the choice of meta-learners is crucial. In this paper, we develop Meta-SGD, an SGD-like, easily trainable meta-learner that can initialize and adapt any differentiable learner in just one step, on both supervised learning and reinforcement learning. Compared to the popular meta-learner LSTM, Meta-SGD is conceptually simpler, easier to implement, and can be learned more efficiently. Compared to the latest meta-learner MAML, Meta-SGD has a much higher capacity by learning to learn not just the learner initialization, but also the learner update direction and learning rate, all in a single meta-learning process. Meta-SGD shows highly competitive performance for few-shot learning on regression, classification, and reinforcement learning.
@article{arxiv.1707.09835,
title = {Meta-SGD: Learning to Learn Quickly for Few-Shot Learning},
author = {Zhenguo Li and Fengwei Zhou and Fei Chen and Hang Li},
journal= {arXiv preprint arXiv:1707.09835},
year = {2017}
}
Comments
reinforcement learning included, 20-way classification on MiniImagenet included