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import pynini
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from fun_text_processing.text_normalization.en.graph_utils import DAMO_NOT_QUOTE, GraphFst, delete_space, insert_space
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from pynini.lib import pynutil
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class DecimalFst(GraphFst):
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"""
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Finite state transducer for verbalizing decimal, e.g.
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decimal { negative: "true" integer_part: "twelve" fractional_part: "five o o six" quantity: "billion" } -> minus twelve point five o o six billion
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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, cardinal, deterministic: bool = True):
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super().__init__(name="decimal", kind="verbalize", deterministic=deterministic)
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self.optional_sign = pynini.cross("negative: \"true\"", "minus ")
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if not deterministic:
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self.optional_sign |= pynini.cross("negative: \"true\"", "negative ")
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self.optional_sign = pynini.closure(self.optional_sign + delete_space, 0, 1)
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self.integer = pynutil.delete("integer_part:") + cardinal.integer
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self.optional_integer = pynini.closure(self.integer + delete_space + insert_space, 0, 1)
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self.fractional_default = (
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pynutil.delete("fractional_part:")
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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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self.fractional = pynutil.insert("point ") + self.fractional_default
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self.quantity = (
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delete_space
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+ insert_space
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+ pynutil.delete("quantity:")
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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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self.optional_quantity = pynini.closure(self.quantity, 0, 1)
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graph = self.optional_sign + (
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self.integer
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| (self.integer + self.quantity)
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| (self.optional_integer + self.fractional + self.optional_quantity)
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)
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self.numbers = graph
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delete_tokens = self.delete_tokens(graph)
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self.fst = delete_tokens.optimize()
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