import pynini
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from fun_text_processing.inverse_text_normalization.tl.graph_utils import (
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DAMO_NOT_QUOTE,
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DAMO_SIGMA,
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GraphFst,
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delete_space,
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)
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from pynini.lib import pynutil
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|
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class OrdinalFst(GraphFst):
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"""
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Finite state transducer for verbalizing ordinal, e.g.
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ordinal { integer: "13" } -> 13th
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"""
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def __init__(self):
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super().__init__(name="ordinal", kind="verbalize")
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graph = (
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pynutil.delete("integer:")
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+ delete_space
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+ pynutil.delete('"')
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+ pynini.closure(DAMO_NOT_QUOTE, 1)
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+ pynutil.delete('"')
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)
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convert_eleven = pynini.cross("11", "11th")
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convert_twelve = pynini.cross("12", "12th")
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convert_thirteen = pynini.cross("13", "13th")
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convert_one = pynini.cross("1", "1st")
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convert_two = pynini.cross("2", "2nd")
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convert_three = pynini.cross("3", "3rd")
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convert_rest = pynutil.insert("th", weight=0.01)
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suffix = pynini.cdrewrite(
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convert_eleven
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| convert_twelve
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| convert_thirteen
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| convert_one
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| convert_two
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| convert_three
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| convert_rest,
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"",
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"[EOS]",
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DAMO_SIGMA,
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)
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graph = graph @ suffix
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delete_tokens = self.delete_tokens(graph)
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self.fst = delete_tokens.optimize()
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