G2Lex

G2Lex compiles pronunciation dictionaries into deterministic, mmap-friendly binary lexicons for exact Python lookup. It is designed for G2P, TTS, ASR, forced alignment, and other speech systems that need large read-only dictionaries.

G2Lex stores exact pronunciations; it does not phonemize unknown words, normalize text, tokenize input, or provide a fallback G2P engine. Use it as the dictionary layer before a consumer-owned fallback.

python -m pip install g2lex
g2lex pack lexicon.tsv lexicon.g2lex --format tsv
g2lex verify lexicon.tsv lexicon.g2lex --format tsv

import g2lex

with g2lex.open("lexicon.g2lex") as lexicon:
    print(lexicon.get("example"))