Radical-level Ideograph Encoder for RNN-based Sentiment Analysis of Chinese and Japanese

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Yuanzhi Ke, Masafumi Hagiwara ;
Proceedings of the Ninth Asian Conference on Machine Learning, PMLR 77:561-573, 2017.

Abstract

The character vocabulary can be very large in non-alphabetic languages such as Chinese and Japanese, which makes neural network models huge to process such languages. We explored a model for sentiment classification that takes the embeddings of the radicals of the Chinese characters, i.e, hanzi of Chinese and kanji of Japanese. Our model is composed of a CNN word feature encoder and a bi-directional RNN document feature encoder. The results achieved are on par with the character embedding-based models, and close to the state-of-the-art word embedding-based models, with 90% smaller vocabulary, and at least 13% and 80% fewer parameters than the character embedding-based models and word embedding-based models respectively. The results suggest that the radical embeddingbased approach is cost-effective for machine learning on Chinese and Japanese.

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