# 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.de.utils import get_abs_path
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from fun_text_processing.text_normalization.en.graph_utils import DAMO_DIGIT, GraphFst, convert_space, insert_space
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from pynini.lib import pynutil
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class TimeFst(GraphFst):
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"""
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Finite state transducer for classifying time, e.g.
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"02:15 Uhr est" -> time { hours: "2" minutes: "15" zone: "e s t"}
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"2 Uhr" -> time { hours: "2" }
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"09:00 Uhr" -> time { hours: "2" }
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"02:15:10 Uhr" -> time { hours: "2" minutes: "15" seconds: "10"}
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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="time", kind="classify", deterministic=deterministic)
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final_suffix = pynutil.delete(" ") + pynutil.delete("Uhr") | pynutil.delete("uhr")
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time_zone_graph = pynini.string_file(get_abs_path("data/time/time_zone.tsv"))
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labels_hour = [str(x) for x in range(0, 25)]
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labels_minute_single = [str(x) for x in range(1, 10)]
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labels_minute_double = [str(x) for x in range(10, 60)]
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delete_leading_zero_to_double_digit = (pynutil.delete("0") | (DAMO_DIGIT - "0")) + DAMO_DIGIT
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graph_hour = pynini.union(*labels_hour)
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graph_minute_single = pynini.union(*labels_minute_single)
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graph_minute_double = pynini.union(*labels_minute_double)
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final_graph_hour_only = pynutil.insert("hours: \"") + graph_hour + pynutil.insert("\"")
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final_graph_hour = (
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pynutil.insert("hours: \"") + delete_leading_zero_to_double_digit @ graph_hour + pynutil.insert("\"")
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)
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final_graph_minute = (
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pynutil.insert("minutes: \"")
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+ (pynutil.delete("0") + graph_minute_single | graph_minute_double)
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+ pynutil.insert("\"")
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)
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final_graph_second = (
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pynutil.insert("seconds: \"")
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+ (pynutil.delete("0") + graph_minute_single | graph_minute_double)
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+ pynutil.insert("\"")
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)
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final_time_zone_optional = pynini.closure(
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pynini.accep(" ") + pynutil.insert("zone: \"") + convert_space(time_zone_graph) + pynutil.insert("\""),
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0,
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1,
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)
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# 02:30 Uhr
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graph_hm = (
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final_graph_hour
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+ pynutil.delete(":")
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+ (pynutil.delete("00") | (insert_space + final_graph_minute))
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+ final_suffix
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+ final_time_zone_optional
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)
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# 10:30:05 Uhr,
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graph_hms = (
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final_graph_hour
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+ pynutil.delete(":")
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+ (pynini.cross("00", " minutes: \"0\"") | (insert_space + final_graph_minute))
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+ pynutil.delete(":")
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+ (pynini.cross("00", " seconds: \"0\"") | (insert_space + final_graph_second))
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+ final_suffix
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+ final_time_zone_optional
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+ pynutil.insert(" preserve_order: true")
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)
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# 2 Uhr est
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graph_h = final_graph_hour_only + final_suffix + final_time_zone_optional
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final_graph = (graph_hm | graph_h | graph_hms).optimize()
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final_graph = self.add_tokens(final_graph)
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self.fst = final_graph.optimize()
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