import pynini
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from fun_text_processing.text_normalization.en.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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insert_space,
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)
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from fun_text_processing.text_normalization.en.verbalizers.ordinal import OrdinalFst
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from pynini.examples import plurals
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from pynini.lib import pynutil
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class FractionFst(GraphFst):
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"""
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Finite state transducer for verbalizing fraction
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e.g. tokens { fraction { integer: "twenty three" numerator: "four" denominator: "five" } } ->
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twenty three and four fifth
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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, lm: bool = False):
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super().__init__(name="fraction", kind="verbalize", deterministic=deterministic)
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suffix = OrdinalFst().suffix
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integer = (
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pynutil.delete('integer_part: "')
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+ pynini.closure(DAMO_NOT_QUOTE)
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+ pynutil.delete('" ')
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)
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denominator_one = pynini.cross('denominator: "one"', "over one")
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denominator_half = pynini.cross('denominator: "two"', "half")
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denominator_quarter = pynini.cross('denominator: "four"', "quarter")
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denominator_rest = (
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pynutil.delete('denominator: "')
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+ pynini.closure(DAMO_NOT_QUOTE) @ suffix
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+ pynutil.delete('"')
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)
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denominators = plurals._priority_union(
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denominator_one,
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plurals._priority_union(
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denominator_half,
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plurals._priority_union(denominator_quarter, denominator_rest, DAMO_SIGMA),
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DAMO_SIGMA,
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),
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DAMO_SIGMA,
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).optimize()
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if not deterministic:
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denominators |= (
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pynutil.delete('denominator: "')
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+ (pynini.accep("four") @ suffix)
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+ pynutil.delete('"')
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)
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numerator_one = pynutil.delete('numerator: "') + pynini.accep("one") + pynutil.delete('" ')
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numerator_one = numerator_one + insert_space + denominators
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numerator_rest = (
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pynutil.delete('numerator: "')
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+ (pynini.closure(DAMO_NOT_QUOTE) - pynini.accep("one"))
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+ pynutil.delete('" ')
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)
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numerator_rest = numerator_rest + insert_space + denominators
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numerator_rest @= pynini.cdrewrite(
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plurals._priority_union(
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pynini.cross("half", "halves"), pynutil.insert("s"), DAMO_SIGMA
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),
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"",
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"[EOS]",
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DAMO_SIGMA,
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)
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graph = numerator_one | numerator_rest
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conjunction = pynutil.insert("and ")
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if not deterministic and not lm:
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conjunction = pynini.closure(conjunction, 0, 1)
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integer = pynini.closure(integer + insert_space + conjunction, 0, 1)
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graph = integer + graph
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graph @= pynini.cdrewrite(
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pynini.cross("and one half", "and a half") | pynini.cross("over ones", "over one"),
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"",
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"[EOS]",
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DAMO_SIGMA,
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)
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self.graph = graph
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delete_tokens = self.delete_tokens(self.graph)
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self.fst = delete_tokens.optimize()
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