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arXiv · 1705.09189

Jointly Learning Sentence Embeddings and Syntax with Unsupervised Tree-LSTMs

Jean Maillard·Stephen Clark·Dani Yogatama
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Abstract

We introduce a neural network that represents sentences by composing their words according to induced binary parse trees. We use Tree-LSTM as our composition function, applied along a tree structure found by a fully differentiable natural language chart parser. Our model simultaneously optimises both the composition function and the parser, thus eliminating the need for externally-provided parse trees which are normally required for Tree-LSTM. It can therefore be seen as a tree-based RNN that is unsupervised with respect to the parse trees. As it is fully differentiable, our model is easily trained with an off-the-shelf gradient descent method and backpropagation. We demonstrate that it achieves better performance compared to various supervised Tree-LSTM architectures on a textual entailment task and a reverse dictionary task.

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Jean Maillard, Stephen Clark, Dani Yogatama. 2017-05-25. Jointly Learning Sentence Embeddings and Syntax with Unsupervised Tree-LSTMs. https://doi.org/10.1017/s1351324919000184

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