BERT for Sentiment Analysis: Pre-trained and Fine-Tuned Alternatives

• URL: http://arxiv.org/abs/2201.03382v1
• Date: Mon, 10 Jan 2022 15:05:05 GMT
• Title: BERT for Sentiment Analysis: Pre-trained and Fine-Tuned Alternatives
• Authors: Frederico Souza, Jo\~ao Filho
• Abstract summary: BERT has revolutionized the NLP field by enabling transfer learning with large language models. This article studies how to better cope with the different embeddings provided by the BERT output layer and the usage of language-specific instead of multilingual models.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: BERT has revolutionized the NLP field by enabling transfer learning with large language models that can capture complex textual patterns, reaching the state-of-the-art for an expressive number of NLP applications. For text classification tasks, BERT has already been extensively explored. However, aspects like how to better cope with the different embeddings provided by the BERT output layer and the usage of language-specific instead of multilingual models are not well studied in the literature, especially for the Brazilian Portuguese language. The purpose of this article is to conduct an extensive experimental study regarding different strategies for aggregating the features produced in the BERT output layer, with a focus on the sentiment analysis task. The experiments include BERT models trained with Brazilian Portuguese corpora and the multilingual version, contemplating multiple aggregation strategies and open-source datasets with predefined training, validation, and test partitions to facilitate the reproducibility of the results. BERT achieved the highest ROC-AUC values for the majority of cases as compared to TF-IDF. Nonetheless, TF-IDF represents a good trade-off between the predictive performance and computational cost.

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