[r/ML] [D] Lossless tokenizers lose nothing and add nothing — trivial observation or worth formalizing?

Summary

This discussion argues that lossless tokenization, from an information-theoretic perspective, neither limits the expressiveness of language models nor introduces unavoidable redundancy. It posits that any string distribution can be exactly induced by a distribution over token sequences, maintaining the original entropy. While theoretically neutral, practical models may show slight deviations from canonical tokenizations.

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