Keyphrases are important phrases that represent the theme of a document. With the help of keyphrases people can quickly find useful information from massive data. Traditional statistic-based methods for keyphrase extraction only make use of the statistical features of the words and ignore the semantic relationship between words. Recently, the emerging methods based on deep neural network extract keyphrases by capturing the semantic contextual information without considering the statistical features. In this paper, we propose a new keyphrase extraction method based on the neural network architecture composing of deep and wide learning parts. In the deep learning part, BERT (Bidirectional Encoder Representation from Transformers) and Bi-LSTM (Bidirectional Long Short-Term Memory) models are used to capture the contextual semantic information from the word sequence while in the wide learning part several important statistical features are considered to jointly train the keyphrase extraction model. The experimental results on two public datasets show that the performance of our proposed model is better than eight commonly baseline keyphrase extraction methods.

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