Which language technology product innovation first successfully implemented transformer architecture, revolutionizing NLP and becoming the foundation for modern language models?

Natural Language Processing (NLP) has transformed how products interact with human language. From simple spell-checkers to sophisticated AI assistants that understand context and nuance, language technology product development has seen remarkable advances. This poll tests your knowledge about a pivotal moment in NLP product development that changed how we interact with technology today.

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Google's BERT (Bidirectional Encoder Representations from Transformers)
Google's 'Attention Is All You Need' paper introducing the Transformer model
OpenAI's GPT (Generative Pre-trained Transformer)
Facebook's RoBERTa (Robustly Optimized BERT Pretraining Approach)