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import pynini
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from fun_text_processing.text_normalization.en.graph_utils import DAMO_NOT_QUOTE, GraphFst
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from pynini.lib import pynutil
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class CardinalFst(GraphFst):
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"""
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Finite state transducer for verbalizing cardinals
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e.g. cardinal { integer: "тысяча один" } -> "тысяча один"
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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="cardinal", kind="verbalize", deterministic=deterministic)
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optional_sign = pynini.closure(pynini.cross("negative: \"true\" ", "минус "), 0, 1)
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optional_quantity_part = pynini.closure(
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pynini.accep(" ")
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+ pynutil.delete("quantity: \"")
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+ pynini.closure(DAMO_NOT_QUOTE, 1)
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+ pynutil.delete("\""),
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0,
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1,
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)
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integer = pynutil.delete("integer: \"") + pynini.closure(DAMO_NOT_QUOTE, 1) + pynutil.delete("\"")
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self.graph = optional_sign + integer + optional_quantity_part
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delete_tokens = self.delete_tokens(self.graph)
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self.fst = delete_tokens.optimize()
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