Which deep learning innovation revolutionized sentiment analysis in retail customer feedback around 2018-2019, enabling more accurate understanding of linguistic context and nuance?

Natural Language Processing (NLP) has transformed how businesses understand customer feedback and sentiment. This trivia question explores a pivotal moment in sentiment analysis technology that revolutionized how companies interpret linguistic nuances in product reviews and customer feedback. Test your knowledge about the technological breakthrough that made modern linguistic sentiment analysis possible in retail and beyond!

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BERT (Bidirectional Encoder Representations from Transformers)
Random Forest Algorithms
Simple Recurrent Neural Networks (RNNs)
Rule-based Sentiment Lexicons