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Ideas become clearer when they survive an explanation.

Derivations, implementation notes, and field reports from building AI systems—written close enough to the code that the inconvenient details remain visible.

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1 article tagged NLP

Mathematical NLPJul 28, 20269 min read

Understanding Viterbi Decoding in Linear-Chain CRFs

How does a global search over exponentially many label sequences collapse into a quadratic-time recurrence without changing the answer?

A derivation of exact MAP decoding from the score of a linear-chain conditional random field, with backpointers and an auditable NumPy implementation.

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