What are the two main phases of an LLM's lifecycle?

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Training and inference — first it learns from data, then it generates output — An LLM is built in training (weights learned from data) and then used in inference (those weights generate text). The two phases are separate — it doesn't learn while you use it.

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Encoding and decoding — first it compresses text, then it expands it back

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Indexing and retrieval — first it stores facts, then it looks them up later

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Compiling and running — first it builds the code, then it executes the code

What are the two main phases of an LLM's lifecycle?

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