import pynini
|
from fun_text_processing.text_normalization.en.graph_utils import (
|
DAMO_NOT_QUOTE,
|
GraphFst,
|
delete_preserve_order,
|
)
|
from pynini.lib import pynutil
|
|
|
class DecimalFst(GraphFst):
|
"""
|
Finite state transducer for verbalizing decimal, e.g.
|
decimal { negative: "true" integer_part: "12" fractional_part: "5006" quantity: "billion" } -> -12.5006 billion
|
|
Args:
|
tn_decimal_verbalizer: TN decimal verbalizer
|
"""
|
|
def __init__(self, tn_decimal_verbalizer: GraphFst, deterministic: bool = True):
|
super().__init__(name="decimal", kind="verbalize", deterministic=deterministic)
|
delete_space = pynutil.delete(" ")
|
optional_sign = pynini.closure(
|
pynutil.delete('negative: "') + DAMO_NOT_QUOTE + pynutil.delete('"') + delete_space,
|
0,
|
1,
|
)
|
optional_integer = pynini.closure(tn_decimal_verbalizer.integer, 0, 1)
|
optional_fractional = pynini.closure(
|
delete_space + pynutil.insert(",") + tn_decimal_verbalizer.fractional_default, 0, 1
|
)
|
graph = (
|
optional_integer + optional_fractional + tn_decimal_verbalizer.optional_quantity
|
).optimize()
|
self.numbers = optional_sign + graph
|
graph = self.numbers + delete_preserve_order
|
delete_tokens = self.delete_tokens(graph)
|
self.fst = delete_tokens.optimize()
|
