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# Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from text_processing.vi.graph_utils import (
NEMO_NOT_QUOTE,
GraphFst,
delete_space,
)
try:
import pynini
from pynini.lib import pynutil
PYNINI_AVAILABLE = True
except (ModuleNotFoundError, ImportError):
PYNINI_AVAILABLE = False
class CardinalFst(GraphFst):
"""
Finite state transducer for verbalizing cardinal
e.g. cardinal { integer: "23" negative: "-" } -> -23
"""
def __init__(self):
super().__init__(name="cardinal", kind="verbalize")
optional_sign = pynini.closure(
pynutil.delete("negative:")
+ delete_space
+ pynutil.delete('"')
+ NEMO_NOT_QUOTE
+ pynutil.delete('"')
+ delete_space,
0,
1,
)
graph = (
pynutil.delete("integer:")
+ delete_space
+ pynutil.delete('"')
+ pynini.closure(NEMO_NOT_QUOTE, 1)
+ pynutil.delete('"')
)
self.numbers = graph
graph = optional_sign + graph
delete_tokens = self.delete_tokens(graph)
self.fst = delete_tokens.optimize()
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