# Stack Long Short-Term Memories

2017/11/22 posted in  NLP

Dyer et al. (2015)1 added an stack pointer $$TOP$$ to a conventional LSTM. The trick is use that $$TOP$$ cell as $$h_{t-1}$$ and $$c_{t-1}$$.

Not only the two standard structures (stack and buffer) in transition-based dependency parsing are implemented via a stack-LSTM, but also a third stack storing history actions are introduced and implemented in the same way. The authors seem to favor stack structure and hope it can encode configurations more thoroughly.

1. C. Dyer, M. Ballesteros, W. Ling, A. Matthews, and N. A. Smith, “Transition-Based Dependency Parsing with Stack Long Short-Term Memory.,” arXiv, vol. 1505, p. arXiv:1505.08075, 2015.