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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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delete_extra_space,
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delete_space,
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)
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from pynini.examples import plurals
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from pynini.lib import pynutil
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class DateFst(GraphFst):
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"""
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Finite state transducer for verbalizing date, e.g.
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date { month: "february" day: "five" year: "twenty twelve" preserve_order: true } -> february fifth twenty twelve
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date { day: "five" month: "february" year: "twenty twelve" preserve_order: true } -> the fifth of february twenty twelve
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Args:
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ordinal: OrdinalFst
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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, ordinal: GraphFst, deterministic: bool = True, lm: bool = False):
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super().__init__(name="date", kind="verbalize", deterministic=deterministic)
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month = pynini.closure(DAMO_NOT_QUOTE, 1)
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day_cardinal = (
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pynutil.delete("day:")
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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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day = day_cardinal @ ordinal.suffix
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month = pynutil.delete("month:") + delete_space + pynutil.delete("\"") + month + pynutil.delete("\"")
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year = (
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pynutil.delete("year:")
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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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+ delete_space
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+ pynutil.delete("\"")
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)
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# month (day) year
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graph_mdy = (
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month + pynini.closure(delete_extra_space + day, 0, 1) + pynini.closure(delete_extra_space + year, 0, 1)
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)
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# may 5 -> may five
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if not deterministic and not lm:
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graph_mdy |= (
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month
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+ pynini.closure(delete_extra_space + day_cardinal, 0, 1)
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+ pynini.closure(delete_extra_space + year, 0, 1)
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)
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# day month year
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graph_dmy = (
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pynutil.insert("the ")
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+ day
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+ delete_extra_space
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+ pynutil.insert("of ")
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+ month
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+ pynini.closure(delete_extra_space + year, 0, 1)
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)
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optional_preserve_order = pynini.closure(
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pynutil.delete("preserve_order:") + delete_space + pynutil.delete("true") + delete_space
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| pynutil.delete("field_order:")
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+ delete_space
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+ pynutil.delete("\"")
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+ DAMO_NOT_QUOTE
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+ pynutil.delete("\"")
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+ delete_space
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)
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final_graph = (
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(plurals._priority_union(graph_mdy, pynutil.add_weight(graph_dmy, 0.0001), DAMO_SIGMA) | year)
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+ delete_space
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+ optional_preserve_order
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)
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delete_tokens = self.delete_tokens(final_graph)
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self.fst = delete_tokens.optimize()
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