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- import pynini
- from fun_text_processing.inverse_text_normalization.vi.graph_utils import DAMO_NOT_QUOTE, GraphFst, delete_space
- from pynini.lib import pynutil
- class FractionFst(GraphFst):
- """
- Finite state transducer for verbalizing fraction,
- e.g. fraction { numerator: "2" denominator: "3" } } -> 2/3
- e.g. fraction { numerator: "20" denominator: "3" negative: "true"} } -> 2/3
- """
- def __init__(self):
- super().__init__(name="fraction", kind="verbalize")
- optional_sign = pynini.closure(pynini.cross('negative: "true"', "-") + delete_space, 0, 1)
- numerator = pynutil.delete('numerator: "') + pynini.closure(DAMO_NOT_QUOTE, 1) + pynutil.delete('"')
- denominator = (
- pynutil.insert("/")
- + pynutil.delete('denominator: "')
- + pynini.closure(DAMO_NOT_QUOTE, 1)
- + pynutil.delete('"')
- )
- graph = (numerator + delete_space + denominator).optimize()
- self.numbers = graph
- delete_tokens = self.delete_tokens(optional_sign + graph)
- self.fst = delete_tokens.optimize()
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