# 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 DAMO_NOT_QUOTE, GraphFst, delete_space, insert_space
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from pynini.lib import pynutil
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class MeasureFst(GraphFst):
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"""
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Finite state transducer for verbalizing measure, e.g.
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measure { negative: "true" cardinal { integer: "twelve" } units: "kilograms" } -> minus twelve kilograms
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measure { decimal { integer_part: "twelve" fractional_part: "five" } units: "kilograms" } -> twelve point five kilograms
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tokens { measure { units: "covid" decimal { integer_part: "nineteen" fractional_part: "five" } } } -> covid nineteen point five
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Args:
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decimal: DecimalFst
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cardinal: CardinalFst
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fraction: FractionFst
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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, decimal: GraphFst, cardinal: GraphFst, fraction: GraphFst, deterministic: bool = True):
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super().__init__(name="measure", kind="verbalize", deterministic=deterministic)
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optional_sign = cardinal.optional_sign
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unit = (
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pynutil.delete("units: \"")
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+ pynini.difference(pynini.closure(DAMO_NOT_QUOTE, 1), pynini.union("address", "math"))
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+ pynutil.delete("\"")
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+ delete_space
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)
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if not deterministic:
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unit |= pynini.compose(unit, pynini.cross(pynini.union("inch", "inches"), "\""))
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graph_decimal = (
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pynutil.delete("decimal {")
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+ delete_space
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+ optional_sign
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+ delete_space
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+ decimal.numbers
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+ delete_space
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+ pynutil.delete("}")
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)
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graph_cardinal = (
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pynutil.delete("cardinal {")
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+ delete_space
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+ optional_sign
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+ delete_space
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+ cardinal.numbers
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+ delete_space
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+ pynutil.delete("}")
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)
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graph_fraction = (
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pynutil.delete("fraction {") + delete_space + fraction.graph + delete_space + pynutil.delete("}")
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)
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graph = (graph_cardinal | graph_decimal | graph_fraction) + delete_space + insert_space + unit
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# SH adds "preserve_order: true" by default
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preserve_order = pynutil.delete("preserve_order:") + delete_space + pynutil.delete("true") + delete_space
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graph |= unit + insert_space + (graph_cardinal | graph_decimal) + delete_space + pynini.closure(preserve_order)
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# for only unit
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graph |= (
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pynutil.delete("cardinal { integer: \"-\"")
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+ delete_space
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+ pynutil.delete("}")
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+ delete_space
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+ unit
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+ pynini.closure(preserve_order)
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)
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address = (
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pynutil.delete("units: \"address\" ")
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+ delete_space
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+ graph_cardinal
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+ delete_space
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+ pynini.closure(preserve_order)
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)
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math = (
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pynutil.delete("units: \"math\" ")
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+ delete_space
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+ graph_cardinal
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+ delete_space
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+ pynini.closure(preserve_order)
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)
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graph |= address | math
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delete_tokens = self.delete_tokens(graph)
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self.fst = delete_tokens.optimize()
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