What is Tokenization?

Tokenization is the process of converting raw text into the sequence of tokens a model can actually process, since a neural network can't work with plain text directly.

• A tokenizer breaks input text apart based on a fixed vocabulary it was built with
• The same tokenizer is used both to prepare input for the model and to decode the model's output tokens back into readable text
• Different models often use different tokenizers, so a "1,000 token" limit can represent slightly different amounts of actual text between models

Tokenization happens before any of the model's actual reasoning, it's the translation step between human-readable text and the numeric representation the model works with internally.

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