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import pynini
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from fun_text_processing.text_normalization.de.taggers.decimal import quantities
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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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GraphFst,
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delete_preserve_order,
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insert_space,
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)
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from pynini.lib import pynutil
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|
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class DecimalFst(GraphFst):
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"""
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Finite state transducer for classifying decimal, e.g.
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decimal { negative: "true" integer_part: "elf" fractional_part: "vier null sechs" quantity: "billionen" } -> minus elf komma vier null sechs billionen
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decimal { integer_part: "eins" quantity: "billion" } -> eins billion
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"""
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def __init__(self, deterministic: bool = True):
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super().__init__(name="decimal", kind="classify", deterministic=deterministic)
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delete_space = pynutil.delete(" ")
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self.optional_sign = pynini.closure(pynini.cross("negative: \"true\"", "minus ") + delete_space, 0, 1)
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self.integer = pynutil.delete("integer_part: \"") + pynini.closure(DAMO_NOT_QUOTE, 1) + pynutil.delete("\"")
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self.fractional_default = (
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pynutil.delete("fractional_part: \"") + pynini.closure(DAMO_NOT_QUOTE, 1) + pynutil.delete("\"")
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)
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self.fractional = pynutil.insert(" komma ") + self.fractional_default
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self.quantity = (
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delete_space + insert_space + pynutil.delete("quantity: \"") + quantities + 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 + self.quantity | self.integer + delete_space + self.fractional + self.optional_quantity
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)
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self.numbers = graph
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graph += delete_preserve_order
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delete_tokens = self.delete_tokens(graph)
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self.fst = delete_tokens.optimize()
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