Recently, deep neural networks start to show promising results in relation extraction.
convolutional Neural Networks (Zeng et al., 2014a;dos Santos et al., 2015;Nguyen and Grishman, 2015), Reccurrent/Recursive Neural Networks such as bidirectional LSTMs (Zhang et al., 2015), LSTM along shortest dependency paths (Xu et al., 2015), bidirectional tree-structured LSTM-RNNs (Miwa and Bansal, 2016) are shown to be effective.