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graph_utils.py
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graph_utils.py
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# Copyright (c) 2021, NVIDIA CORPORATION. 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
import pynini
from pynini import Far
from pynini.examples import plurals
from pynini.export import export
from pynini.lib import byte, pynutil, utf8
from nemo_text_processing.text_normalization.en.utils import get_abs_path, load_labels
from nemo_text_processing.utils.logging import logger
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)
NEMO_LOWER_NOT_A = pynini.union(
"b",
"c",
"d",
"e",
"f",
"g",
"h",
"i",
"j",
"k",
"l",
"m",
"n",
"o",
"p",
"q",
"r",
"s",
"t",
"u",
"v",
"w",
"x",
"y",
"z",
).optimize()
delete_space = pynutil.delete(pynini.closure(NEMO_WHITE_SPACE))
delete_zero_or_one_space = pynutil.delete(pynini.closure(NEMO_WHITE_SPACE, 0, 1))
insert_space = pynutil.insert(" ")
delete_extra_space = pynini.cross(pynini.closure(NEMO_WHITE_SPACE, 1), " ")
delete_preserve_order = pynini.closure(
pynutil.delete(" preserve_order: true")
| (pynutil.delete(' field_order: "') + NEMO_NOT_QUOTE + pynutil.delete('"'))
)
# Common string literals; expand as you see fit.
username_string = "username"
double_quotes = '"'
domain_string = "domain"
protocol_string = "protocol"
slash = "/"
double_slash = "//"
triple_slash = "///"
file = "file"
period = "."
at = "@"
colon = ":"
https = "https"
http = "http"
www = "www"
suppletive = pynini.string_file(get_abs_path("data/suppletive.tsv"))
# _v = pynini.union("a", "e", "i", "o", "u")
_c = pynini.union(
"b", "c", "d", "f", "g", "h", "j", "k", "l", "m", "n", "p", "q", "r", "s", "t", "v", "w", "x", "y", "z",
)
_ies = NEMO_SIGMA + _c + pynini.cross("y", "ies")
_es = NEMO_SIGMA + pynini.union("s", "sh", "ch", "x", "z") + pynutil.insert("es")
_s = NEMO_SIGMA + pynutil.insert("s")
graph_plural = plurals._priority_union(
suppletive, plurals._priority_union(_ies, plurals._priority_union(_es, _s, NEMO_SIGMA), NEMO_SIGMA), NEMO_SIGMA,
).optimize()
SINGULAR_TO_PLURAL = graph_plural
PLURAL_TO_SINGULAR = pynini.invert(graph_plural)
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)
MIN_NEG_WEIGHT = -0.0001
MIN_POS_WEIGHT = 0.0001
INPUT_CASED = "cased"
INPUT_LOWER_CASED = "lower_cased"
MINUS = pynini.union("minus", "Minus").optimize()
def capitalized_input_graph(
graph: "pynini.FstLike", original_graph_weight: float = None, capitalized_graph_weight: float = None,
) -> "pynini.FstLike":
"""
Allow graph input to be capitalized, e.g. for ITN)
Args:
graph: FstGraph
original_graph_weight: weight to add to the original `graph`
capitalized_graph_weight: weight to add to the capitalized graph
"""
capitalized_graph = pynini.compose(TO_LOWER + NEMO_SIGMA, graph).optimize()
if original_graph_weight is not None:
graph = pynutil.add_weight(graph, weight=original_graph_weight)
if capitalized_graph_weight is not None:
capitalized_graph = pynutil.add_weight(capitalized_graph, weight=capitalized_graph_weight)
graph |= capitalized_graph
return graph
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()
logger.info(f"Created {file_name}")
def get_plurals(fst):
"""
Given singular returns plurals
Args:
fst: Fst
Returns plurals to given singular forms
"""
return SINGULAR_TO_PLURAL @ fst
def get_singulars(fst):
"""
Given plural returns singulars
Args:
fst: Fst
Returns singulars to given plural forms
"""
return PLURAL_TO_SINGULAR @ fst
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)
def string_map_cased(input_file: str, input_case: str = INPUT_LOWER_CASED):
labels = load_labels(input_file)
if input_case == INPUT_CASED:
additional_labels = []
for written, spoken, *weight in labels:
written_capitalized = written[0].upper() + written[1:]
additional_labels.extend(
[
[written_capitalized, spoken.capitalize(),], # first letter capitalized
[
written_capitalized,
spoken.upper().replace(" AND ", " and "),
], # # add pairs with the all letters capitalized
]
)
spoken_no_space = spoken.replace(" ", "")
# add abbreviations without spaces (both lower and upper case), i.e. "BMW" not "B M W"
if len(spoken) == (2 * len(spoken_no_space) - 1):
logger.debug(f"This is weight {weight}")
if len(weight) == 0:
additional_labels.extend(
[[written, spoken_no_space], [written_capitalized, spoken_no_space.upper()],]
)
else:
additional_labels.extend(
[
[written, spoken_no_space, weight[0]],
[written_capitalized, spoken_no_space.upper(), weight[0]],
]
)
labels += additional_labels
whitelist = pynini.string_map(labels).invert().optimize()
return whitelist
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 = kind
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)