This story was originally published on HackerNoon at:
https://hackernoon.com/what-happens-inside-an-llm-when-you-type-hello.
A beginner-friendly walkthrough of how LLMs turn text into tokens, embeddings, attention patterns, probabilities, and generated responses.
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What looks like a simple “Hello” to us becomes a sequence of tokens, vectors, attention calculations, probabilities, and generated tokens inside an LLM. This article follows that journey step by step—from tokenization and embeddings to Transformers, training, attention, sampling, and the final response.