textnorm
reference
O'REILLY tutorial: https://www.oreilly.com/content/how-to-get-superior-text-processing-in-python-with-pynini/
pynini paper: https://aclanthology.org/W16-2409.pdf
pynini doc: https://www.openfst.org/twiki/bin/view/GRM/PyniniDocs
Gorman slides: https://www.ldc.upenn.edu/sites/www.ldc.upenn.edu/files/kbg2019.pdf