Which AI language product launch in 2018 revolutionized natural language processing by introducing a technique called 'bidirectional transformers' that dramatically improved language understanding?

In recent years, the language technology industry has seen remarkable product launches that have transformed how we interact with language. From translation tools to advanced language models, these innovations have redefined linguistics in the digital age. This poll tests your knowledge about a significant product launch that changed the landscape of computational linguistics and natural language processing. How well do you know the history of language technology products?

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BERT (Bidirectional Encoder Representations from Transformers) by Google
GPT (Generative Pre-trained Transformer) by OpenAI
XLNet by Carnegie Mellon University and Google
RoBERTa by Facebook AI Research