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# Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# Copyright 2015 and onwards Google, Inc.
#
# 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.
import os
import string
from pathlib import Path
from typing import Dict
try:
import pynini
from pynini import Far
from pynini.export import export
from pynini.lib import byte, pynutil, utf8
NEMO_CHAR = utf8.VALID_UTF8_CHAR
NEMO_DIGIT = byte.DIGIT
NEMO_LOWER = pynini.union(*string.ascii_lowercase).optimize()
NEMO_UPPER = pynini.union(*string.ascii_uppercase).optimize()
NEMO_ALPHA = pynini.union(NEMO_LOWER, NEMO_UPPER).optimize()
NEMO_ALNUM = pynini.union(NEMO_DIGIT, NEMO_ALPHA).optimize()
NEMO_HEX = pynini.union(*string.hexdigits).optimize()
NEMO_NON_BREAKING_SPACE = "\u00A0"
NEMO_SPACE = " "
NEMO_WHITE_SPACE = pynini.union(" ", "\t", "\n", "\r", "\u00A0").optimize()
NEMO_NOT_SPACE = pynini.difference(NEMO_CHAR, NEMO_WHITE_SPACE).optimize()
NEMO_NOT_QUOTE = pynini.difference(NEMO_CHAR, r'"').optimize()
NEMO_PUNCT = pynini.union(*map(pynini.escape, string.punctuation)).optimize()
NEMO_GRAPH = pynini.union(NEMO_ALNUM, NEMO_PUNCT).optimize()
NEMO_SIGMA = pynini.closure(NEMO_CHAR)
delete_space = pynutil.delete(pynini.closure(NEMO_WHITE_SPACE))
insert_space = pynutil.insert(" ")
delete_extra_space = pynini.cross(pynini.closure(NEMO_WHITE_SPACE, 1), " ")
# French frequently compounds numbers with hyphen.
delete_hyphen = pynutil.delete(pynini.closure("-", 0, 1))
insert_hyphen = pynutil.insert("-")
TO_LOWER = pynini.union(*[pynini.cross(x, y) for x, y in zip(string.ascii_uppercase, string.ascii_lowercase)])
TO_UPPER = pynini.invert(TO_LOWER)
PYNINI_AVAILABLE = True
except (ModuleNotFoundError, ImportError):
# Create placeholders
NEMO_CHAR = None
NEMO_DIGIT = None
NEMO_LOWER = None
NEMO_UPPER = None
NEMO_ALPHA = None
NEMO_ALNUM = None
NEMO_HEX = None
NEMO_NON_BREAKING_SPACE = "\u00A0"
NEMO_SPACE = " "
NEMO_WHITE_SPACE = None
NEMO_NOT_SPACE = None
NEMO_NOT_QUOTE = None
NEMO_PUNCT = None
NEMO_GRAPH = None
NEMO_SIGMA = None
delete_space = None
insert_space = None
delete_extra_space = None
delete_hyphen = None
insert_hyphen = None
TO_LOWER = None
TO_UPPER = None
PYNINI_AVAILABLE = False
def generator_main(file_name: str, graphs: Dict[str, pynini.FstLike]):
"""
Exports graph as OpenFst finite state archive (FAR) file with given file name and rule name.
Args:
file_name: exported file name
graphs: Mapping of a rule name and Pynini WFST graph to be exported
"""
exporter = export.Exporter(file_name)
for rule, graph in graphs.items():
exporter[rule] = graph.optimize()
exporter.close()
print(f"Created {file_name}")
def convert_space(fst) -> "pynini.FstLike":
"""
Converts space to nonbreaking space.
Used only in tagger grammars for transducing token values within quotes, e.g. name: "hello kitty"
This is making transducer significantly slower, so only use when there could be potential spaces within quotes, otherwise leave it.
Args:
fst: input fst
Returns output fst where breaking spaces are converted to non breaking spaces
"""
return fst @ pynini.cdrewrite(pynini.cross(NEMO_SPACE, NEMO_NON_BREAKING_SPACE), "", "", NEMO_SIGMA)
class GraphFst:
"""
Base class for all grammar fsts.
Args:
name: name of grammar class
kind: either 'classify' or 'verbalize'
deterministic: if True will provide a single transduction option,
for False multiple transduction are generated (used for audio-based normalization)
"""
def __init__(self, name: str, kind: str, deterministic: bool = True):
self.name = name
self.kind = str
self._fst = None
self.deterministic = deterministic
self.far_path = Path(os.path.dirname(__file__) + "/grammars/" + kind + "/" + name + ".far")
if self.far_exist():
self._fst = Far(self.far_path, mode="r", arc_type="standard", far_type="default").get_fst()
def far_exist(self) -> bool:
"""
Returns true if FAR can be loaded
"""
return self.far_path.exists()
@property
def fst(self) -> "pynini.FstLike":
return self._fst
@fst.setter
def fst(self, fst):
self._fst = fst
def add_tokens(self, fst) -> "pynini.FstLike":
"""
Wraps class name around to given fst
Args:
fst: input fst
Returns:
Fst: fst
"""
return pynutil.insert(f"{self.name} {{ ") + fst + pynutil.insert(" }")
def delete_tokens(self, fst) -> "pynini.FstLike":
"""
Deletes class name wrap around output of given fst
Args:
fst: input fst
Returns:
Fst: fst
"""
res = (
pynutil.delete(f"{self.name}")
+ delete_space
+ pynutil.delete("{")
+ delete_space
+ fst
+ delete_space
+ pynutil.delete("}")
)
return res @ pynini.cdrewrite(pynini.cross("\u00A0", " "), "", "", NEMO_SIGMA)
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