Abstract
Analyzing reviews with respect to each aspect gives better understanding as compared to overall opinions and this requires the aspect terms and their corresponding opinions to be extracted. Supervised models for aspect term extraction require large amount of labeled data. Aspect annotated data is scarcely available for use and the cost of manual annotation of the entire data is huge. This study proposes a way of using Active Learning to select a highly informative subset of the data that needs to be labeled, to train the supervised model. The identification of aspect terms is defined as a sequence labelling problem with the help of BiLSTM network and CRF. The model is trained on publicly available SemEval (2014–16) datasets for restaurant and laptop reviews. The results show a 36% and 42% reduction in annotation cost for restaurants and laptops respectively, with negligible effect on the model’s performance. A significant difference in cost is observed between active learning guided sampling and random sampling approaches.
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Shyam Sundar, K., Gupta, D. (2021). Active Learning Enhanced Sequence Labeling for Aspect Term Extraction in Review Data. In: Garg, D., Wong, K., Sarangapani, J., Gupta, S.K. (eds) Advanced Computing. IACC 2020. Communications in Computer and Information Science, vol 1367. Springer, Singapore. https://doi.org/10.1007/978-981-16-0401-0_27
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