Which linguistic innovation significantly improved retail chatbot performance around 2018-2019, allowing them to better understand context in customer queries?

Modern retail chatbots are sophisticated linguistic tools that have transformed customer service. Behind their seemingly simple interfaces lies complex language processing technology that can understand regional dialects, slang, and even emotional nuances. Test your knowledge about how language technology is revolutionizing retail interactions through advanced chatbot systems.

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BERT (Bidirectional Encoder Representations from Transformers)
RNN (Recurrent Neural Networks)
LSI (Latent Semantic Indexing)
ROUGE (Recall-Oriented Understudy for Gisting Evaluation)