How do large language models like ChatGPT generate human-like text?

Large language models like ChatGPT are like smart friends who know how to write stories or messages based on what you say.

Imagine you have a friend who has read every book in the world, and they remember all of them. When you start telling them a story, they guess what comes next, based on what they’ve learned from all those books. That’s kind of like how large language models work.

When ChatGPT was being trained, it looked at lots and lots of text, like sentences from books, websites, and messages people write every day. It noticed patterns in words and how they connect to each other. For example, if the sentence starts with "Once upon a time," it knows that a story is about to begin.

When you ask ChatGPT a question or start writing something, it uses what it learned to guess the next word, then the one after that, and so on. It's like playing a game of "What comes next?" with a friend who has read everything in the world!

So, even though it doesn't use magic, it feels almost magical because it can write stories, answer questions, or help you with homework, just like your smartest friend!