import pynini
|
from fun_text_processing.text_normalization.en.graph_utils import (
|
DAMO_NOT_QUOTE,
|
GraphFst,
|
delete_space,
|
)
|
from pynini.lib import pynutil
|
|
|
class TimeFst(GraphFst):
|
"""
|
Finite state transducer for verbalizing time
|
e.g. time { hours: "02:15" } -> "02:15"
|
"""
|
|
def __init__(self):
|
super().__init__(name="time", kind="verbalize")
|
hour = (
|
pynutil.delete("hours: ")
|
+ pynutil.delete('"')
|
+ pynini.closure(DAMO_NOT_QUOTE, 1)
|
+ pynutil.delete('"')
|
)
|
minutes = (
|
pynutil.delete("minutes: ")
|
+ pynutil.delete('"')
|
+ pynini.closure(DAMO_NOT_QUOTE, 1)
|
+ pynutil.delete('"')
|
)
|
|
graph_preserve_order = (
|
pynutil.delete('hours: "') + pynini.closure(DAMO_NOT_QUOTE, 1) + pynutil.delete('"')
|
)
|
|
# for cases that require permutations for the correct verbalization
|
graph_reverse_order = hour + delete_space + pynutil.insert(":") + minutes + delete_space
|
|
graph = graph_preserve_order | graph_reverse_order
|
delete_tokens = self.delete_tokens(graph)
|
self.fst = delete_tokens.optimize()
|
