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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_space,
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insert_space,
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)
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from pynini.lib import pynutil
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class TimeFst(GraphFst):
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"""
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Finite state transducer for verbalizing time, e.g.
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time { hours: "twelve" minutes: "thirty" suffix: "a m" zone: "e s t" } -> twelve thirty a m e s t
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time { hours: "twelve" } -> twelve o'clock
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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="time", kind="verbalize", deterministic=deterministic)
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hour = (
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pynutil.delete("hours:")
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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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minute = (
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pynutil.delete("minutes:")
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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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suffix = (
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pynutil.delete("suffix:")
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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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optional_suffix = pynini.closure(delete_space + insert_space + suffix, 0, 1)
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zone = (
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pynutil.delete("zone:")
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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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optional_zone = pynini.closure(delete_space + insert_space + zone, 0, 1)
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second = (
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pynutil.delete("seconds:")
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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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graph_hms = (
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hour
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+ pynutil.insert(" hours ")
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+ delete_space
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+ minute
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+ pynutil.insert(" minutes and ")
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+ delete_space
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+ second
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+ pynutil.insert(" seconds")
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+ optional_suffix
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+ optional_zone
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)
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graph_hms @= pynini.cdrewrite(
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pynutil.delete("o ")
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| pynini.cross("one minutes", "one minute")
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| pynini.cross("one seconds", "one second")
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| pynini.cross("one hours", "one hour"),
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pynini.union(" ", "[BOS]"),
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"",
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DAMO_SIGMA,
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)
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graph = hour + delete_space + insert_space + minute + optional_suffix + optional_zone
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graph |= hour + insert_space + pynutil.insert("o'clock") + optional_zone
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graph |= hour + delete_space + insert_space + suffix + optional_zone
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graph |= graph_hms
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delete_tokens = self.delete_tokens(graph)
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self.fst = delete_tokens.optimize()
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