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