# 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_preserve_order
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from pynini.lib import pynutil
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class DecimalFst(GraphFst):
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"""
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Finite state transducer for verbalizing decimal, e.g.
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decimal { negative: "true" integer_part: "12" fractional_part: "5006" quantity: "billion" } -> -12.5006 billion
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Args:
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tn_decimal_verbalizer: TN decimal verbalizer
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"""
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def __init__(self, tn_decimal_verbalizer: GraphFst, deterministic: bool = True):
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super().__init__(name="decimal", kind="verbalize", deterministic=deterministic)
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delete_space = pynutil.delete(" ")
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optional_sign = pynini.closure(
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pynutil.delete("negative: \"") + DAMO_NOT_QUOTE + pynutil.delete("\"") + delete_space, 0, 1
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)
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optional_integer = pynini.closure(tn_decimal_verbalizer.integer, 0, 1)
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optional_fractional = pynini.closure(
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delete_space + pynutil.insert(",") + tn_decimal_verbalizer.fractional_default, 0, 1
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)
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graph = (optional_integer + optional_fractional + tn_decimal_verbalizer.optional_quantity).optimize()
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self.numbers = optional_sign + graph
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graph = self.numbers + delete_preserve_order
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delete_tokens = self.delete_tokens(graph)
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self.fst = delete_tokens.optimize()
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