Dynamic Evaluation of Neural Sequence Models

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Ben Krause, Emmanuel Kahembwe, Iain Murray, Steve Renals ;
Proceedings of the 35th International Conference on Machine Learning, PMLR 80:2766-2775, 2018.

Abstract

We explore dynamic evaluation, where sequence models are adapted to the recent sequence history using gradient descent, assigning higher probabilities to re-occurring sequential patterns. We develop a dynamic evaluation approach that outperforms existing adaptation approaches in our comparisons. We apply dynamic evaluation to outperform all previous word-level perplexities on the Penn Treebank and WikiText-2 datasets (achieving 51.1 and 44.3 respectively) and all previous character-level cross-entropies on the text8 and Hutter Prize datasets (achieving 1.19 bits/char and 1.08 bits/char respectively).

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