Reformer: The Efficient Transformer
Authors: Nikita Kitaev, Łukasz Kaiser, Anselm Levskaya
AI-generated Key Points
- The paper introduces two techniques to enhance the efficiency of Transformer models: locality-sensitive hashing and reversible residual layers.
- Locality-sensitive hashing reduces the complexity of attention from O($L^2$) to O($L\log L$), improving computational efficiency.
- Reversible residual layers allow for storing activations only once during training, enhancing memory efficiency.
- The resulting model, called Reformer, achieves performance comparable to traditional Transformers while being more memory-efficient and faster when processing long sequences.
- Reformer addresses the challenge of high computational costs associated with training large Transformers and provides a more efficient solution for handling long sequences.
Abstract: Large Transformer models routinely achieve state-of-the-art results on a number of tasks but training these models can be prohibitively costly, especially on long sequences. We introduce two techniques to improve the efficiency of Transformers. For one, we replace dot-product attention by one that uses locality-sensitive hashing, changing its complexity from O($L^2$) to O($L\log L$), where $L$ is the length of the sequence. Furthermore, we use reversible residual layers instead of the standard residuals, which allows storing activations only once in the training process instead of $N$ times, where $N$ is the number of layers. The resulting model, the Reformer, performs on par with Transformer models while being much more memory-efficient and much faster on long sequences.
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