How to use the pynini.NO_STATE_ID function in pynini
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kylebgorman / EditTransducer / edit_transducer / edit_transducer.py View on Github 
def check_wellformed_lattice(lattice):
"""Raises an error if the lattice is empty.
Args:
lattice: A lattice FST.
Raises:
Error: Lattice is empty.
"""
if lattice.start() == NO_STATE_ID:
raise Error("Lattice is empty")
