78 lines
2.9 KiB
Python
78 lines
2.9 KiB
Python
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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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GraphFst,
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delete_preserve_order,
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)
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from pynini.lib import pynutil
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class MoneyFst(GraphFst):
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"""
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Finite state transducer for verbalizing money, e.g.
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money { currency_maj: "euro" integer_part: "ein"} -> "ein euro"
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money { currency_maj: "euro" integer_part: "eins" fractional_part: "null null eins"} -> "eins komma null null eins euro"
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money { integer_part: "ein" currency_maj: "pfund" fractional_part: "vierzig" preserve_order: true} -> "ein pfund vierzig"
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money { integer_part: "ein" currency_maj: "pfund" fractional_part: "vierzig" currency_min: "pence" preserve_order: true} -> "ein pfund vierzig pence"
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money { fractional_part: "ein" currency_min: "penny" preserve_order: true} -> "ein penny"
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money { currency_maj: "pfund" integer_part: "null" fractional_part: "null eins" quantity: "million"} -> "null komma null eins million pfund"
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Args:
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decimal: GraphFst
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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, decimal: GraphFst, deterministic: bool = True):
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super().__init__(name="money", kind="verbalize", deterministic=deterministic)
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keep_space = pynini.accep(" ")
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maj = (
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pynutil.delete('currency_maj: "')
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+ pynini.closure(DAMO_NOT_QUOTE, 1)
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+ pynutil.delete('"')
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)
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min = (
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pynutil.delete('currency_min: "')
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+ pynini.closure(DAMO_NOT_QUOTE, 1)
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+ pynutil.delete('"')
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)
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fractional_part = (
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pynutil.delete('fractional_part: "')
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+ pynini.closure(DAMO_NOT_QUOTE, 1)
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+ pynutil.delete('"')
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)
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integer_part = (
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pynutil.delete('integer_part: "')
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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_add_and = pynini.closure(pynutil.insert("und "), 0, 1)
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# *** currency_maj
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graph_integer = integer_part + keep_space + maj
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# *** currency_maj + (***) | ((und) *** current_min)
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graph_integer_with_minor = (
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integer_part
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+ keep_space
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+ maj
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+ keep_space
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+ (fractional_part | (optional_add_and + fractional_part + keep_space + min))
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+ delete_preserve_order
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)
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# *** komma *** currency_maj
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graph_decimal = decimal.fst + keep_space + maj
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# *** current_min
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graph_minor = fractional_part + keep_space + min + delete_preserve_order
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graph = graph_integer | graph_integer_with_minor | graph_decimal | graph_minor
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delete_tokens = self.delete_tokens(graph)
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self.fst = delete_tokens.optimize()
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