Which advanced linguistic feature first allowed retail chatbots to significantly improve their understanding of customer intent in 2018?

Modern retail chatbots represent a fascinating intersection of language technology and customer service. These AI systems must navigate the complexities of human language while providing helpful shopping assistance. This poll tests your knowledge about how language processing capabilities have evolved in retail chatbot technology and the linguistic challenges these systems face when interacting with diverse customer populations.

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Sentiment analysis with contextual emotion detection
Bidirectional Encoder Representations from Transformers (BERT)
Multilingual translation with regional dialect processing
Voice pattern recognition with semantic parsing