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- import pynini
- from fun_text_processing.text_normalization.en.graph_utils import DAMO_NOT_QUOTE, GraphFst, delete_space
- from pynini.lib import pynutil
- class CardinalFst(GraphFst):
- """
- Finite state transducer for verbalizing cardinal
- e.g. cardinal { negative: "-" integer: "23" } -> -23
- """
- def __init__(self):
- super().__init__(name="cardinal", kind="verbalize")
- optional_sign = pynini.closure(
- pynutil.delete("negative:")
- + delete_space
- + pynutil.delete("\"")
- + DAMO_NOT_QUOTE
- + pynutil.delete("\"")
- + delete_space,
- 0,
- 1,
- )
- graph = (
- pynutil.delete("integer:")
- + delete_space
- + pynutil.delete("\"")
- + pynini.closure(DAMO_NOT_QUOTE, 1)
- + pynutil.delete("\"")
- )
- self.numbers = graph
- graph = optional_sign + graph
- delete_tokens = self.delete_tokens(graph)
- self.fst = delete_tokens.optimize()
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