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