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 OrdinalFst(GraphFst):
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"""
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Finite state transducer for verbalizing ordinal numbers
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e.g. ordinal { integer: "2" } -> "2"
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Args:
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deterministic: if True will provide a single transduction option,
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for False multiple transduction are generated (used for audio-based normalization)
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"""
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def __init__(self, deterministic: bool = True):
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super().__init__(name="ordinal", kind="verbalize", deterministic=deterministic)
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value = pynini.closure(DAMO_NOT_QUOTE)
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graph = pynutil.delete('integer: "') + value + pynutil.delete('"')
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delete_tokens = self.delete_tokens(graph)
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self.fst = delete_tokens.optimize()
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