# Copyright NeMo (https://github.com/NVIDIA/NeMo). All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import pynini
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from fun_text_processing.text_normalization.en.graph_utils import (
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DAMO_ALPHA,
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DAMO_DIGIT,
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DAMO_SIGMA,
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GraphFst,
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delete_extra_space,
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delete_space,
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insert_space,
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plurals,
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)
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from fun_text_processing.text_normalization.en.utils import get_abs_path
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from pynini.lib import pynutil
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class TelephoneFst(GraphFst):
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"""
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Finite state transducer for classifying telephone, and IP, and SSN which includes country code, number part and extension
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country code optional: +***
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number part: ***-***-****, or (***) ***-****
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extension optional: 1-9999
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E.g
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+1 123-123-5678-1 -> telephone { country_code: "one" number_part: "one two three, one two three, five six seven eight" extension: "one" }
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1-800-GO-U-HAUL -> telephone { country_code: "one" number_part: "one, eight hundred GO U HAUL" }
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Args:
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deterministic: if True will provide a single transduction option,
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for False multiple transduction are generated (used for audio-based normalization)
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"""
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def __init__(self, deterministic: bool = True):
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super().__init__(name="telephone", kind="classify", deterministic=deterministic)
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add_separator = pynutil.insert(", ") # between components
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zero = pynini.cross("0", "zero")
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if not deterministic:
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zero |= pynini.cross("0", pynini.union("o", "oh"))
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digit = pynini.invert(pynini.string_file(get_abs_path("data/number/digit.tsv"))).optimize() | zero
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telephone_prompts = pynini.string_file(get_abs_path("data/telephone/telephone_prompt.tsv"))
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country_code = (
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pynini.closure(telephone_prompts + delete_extra_space, 0, 1)
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+ pynini.closure(pynini.cross("+", "plus "), 0, 1)
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+ pynini.closure(digit + insert_space, 0, 2)
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+ digit
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+ pynutil.insert(",")
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)
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country_code |= telephone_prompts
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country_code = pynutil.insert("country_code: \"") + country_code + pynutil.insert("\"")
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country_code = country_code + pynini.closure(pynutil.delete("-"), 0, 1) + delete_space + insert_space
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area_part_default = pynini.closure(digit + insert_space, 2, 2) + digit
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area_part = pynini.cross("800", "eight hundred") | pynini.compose(
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pynini.difference(DAMO_SIGMA, "800"), area_part_default
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)
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area_part = (
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(area_part + (pynutil.delete("-") | pynutil.delete(".")))
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| (
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pynutil.delete("(")
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+ area_part
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+ ((pynutil.delete(")") + pynini.closure(pynutil.delete(" "), 0, 1)) | pynutil.delete(")-"))
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)
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) + add_separator
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del_separator = pynini.closure(pynini.union("-", " ", "."), 0, 1)
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number_length = ((DAMO_DIGIT + del_separator) | (DAMO_ALPHA + del_separator)) ** 7
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number_words = pynini.closure(
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(DAMO_DIGIT @ digit) + (insert_space | (pynini.cross("-", ', ')))
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| DAMO_ALPHA
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| (DAMO_ALPHA + pynini.cross("-", ' '))
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)
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number_words |= pynini.closure(
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(DAMO_DIGIT @ digit) + (insert_space | (pynini.cross(".", ', ')))
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| DAMO_ALPHA
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| (DAMO_ALPHA + pynini.cross(".", ' '))
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)
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number_words = pynini.compose(number_length, number_words)
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number_part = area_part + number_words
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number_part = pynutil.insert("number_part: \"") + number_part + pynutil.insert("\"")
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extension = (
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pynutil.insert("extension: \"") + pynini.closure(digit + insert_space, 0, 3) + digit + pynutil.insert("\"")
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)
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extension = pynini.closure(insert_space + extension, 0, 1)
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graph = plurals._priority_union(country_code + number_part, number_part, DAMO_SIGMA).optimize()
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graph = plurals._priority_union(country_code + number_part + extension, graph, DAMO_SIGMA).optimize()
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graph = plurals._priority_union(number_part + extension, graph, DAMO_SIGMA).optimize()
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# ip
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ip_prompts = pynini.string_file(get_abs_path("data/telephone/ip_prompt.tsv"))
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digit_to_str_graph = digit + pynini.closure(pynutil.insert(" ") + digit, 0, 2)
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ip_graph = digit_to_str_graph + (pynini.cross(".", " dot ") + digit_to_str_graph) ** 3
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graph |= (
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pynini.closure(
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pynutil.insert("country_code: \"") + ip_prompts + pynutil.insert("\"") + delete_extra_space, 0, 1
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)
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+ pynutil.insert("number_part: \"")
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+ ip_graph.optimize()
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+ pynutil.insert("\"")
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)
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# ssn
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ssn_prompts = pynini.string_file(get_abs_path("data/telephone/ssn_prompt.tsv"))
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three_digit_part = digit + (pynutil.insert(" ") + digit) ** 2
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two_digit_part = digit + pynutil.insert(" ") + digit
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four_digit_part = digit + (pynutil.insert(" ") + digit) ** 3
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ssn_separator = pynini.cross("-", ", ")
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ssn_graph = three_digit_part + ssn_separator + two_digit_part + ssn_separator + four_digit_part
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graph |= (
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pynini.closure(
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pynutil.insert("country_code: \"") + ssn_prompts + pynutil.insert("\"") + delete_extra_space, 0, 1
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)
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+ pynutil.insert("number_part: \"")
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+ ssn_graph.optimize()
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+ pynutil.insert("\"")
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)
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final_graph = self.add_tokens(graph)
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self.fst = final_graph.optimize()
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