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TO MOST PEOPLE, the inner workings of a car engine or a computer are a mystery. It might as well be a black box: never mind what goes on inside, as long as it works. Besides, the people who design and build such complex systems know how they work in great detail, and can diagnose and fix them when they go wrong. But that is not the case for large language models (LLMs), such as GPT-4, Claude and Gemini, which are at the forefront of the boom in artificial intelligence (AI).
LLMs are built using a technique called deep learning, in which a network of billions of neurons, simulated in software and modelled on the structure of the human brain, is exposed to trillions of examples of something to discover inherent patterns. Trained on text strings, LLMs can hold conversations, generate text in a variety of styles, write software code, translate between languages and more besides.
