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Implement a WordPiece tokenizer from scratch: greedy longest-match-first subword segmentation.

A from-scratch test of subword tokenization. The signal is greedy longest-match encoding against a fixed vocabulary, the continuation-prefix convention, and how WordPiece differs from BPE. Here is the implementation.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

A from-scratch test of subword tokenization. The signal is greedy longest-match encoding against a fixed vocabulary, the continuation-prefix convention, and how WordPiece differs from BPE. Here is the implementation.

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