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SentencePiece

A language-agnostic tokenization library that treats text as a sequence of Unicode characters.

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3 stops · basics first
  1. Token ✓ understood

    The basic unit of text that a language model processes, typically representing a word, subword, or character. Tokens are the fundamental building blocks for LLM input and output.

  2. Tokenization ✓ understood

    Splitting text into tokens, usually subword pieces, and mapping each to an integer ID so a language model can process it.

  3. Subword Tokenization ✓ understood

    Breaking words into smaller units, balancing vocabulary size with representation granularity.

  4. SentencePiece · you are here ✓ understood

A language-agnostic tokenization library that treats text as a sequence of Unicode characters.

This concept is essential for understanding large language models and forms a key part of modern AI systems.

  • Tokenization
  • BPE
  • Subword

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Subword Tokenization
SentencePiece

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Language & LLMs BPE Byte Pair Encoding - a subword tokenization algorithm that iteratively merges frequent character pairs to create a vocabulary. Language & LLMs WordPiece A subword tokenization algorithm used by BERT, similar to BPE but with different merging criteria. Language & LLMs Tokenization Splitting text into tokens, usually subword pieces, and mapping each to an integer ID so a language model can process it. Language & LLMs Vocabulary Size The number of distinct tokens a language model can process, typically 30K-100K+ tokens.