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77 lines
2.6 KiB
77 lines
2.6 KiB
// Copyright 2005-2024 Google LLC
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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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//
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// See www.openfst.org for extensive documentation on this weighted
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// finite-state transducer library.
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#ifndef FST_SCRIPT_DETERMINIZE_H_
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#define FST_SCRIPT_DETERMINIZE_H_
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#include <cstdint>
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#include <tuple>
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#include <fst/determinize.h>
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#include <fst/fst.h>
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#include <fst/mutable-fst.h>
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#include <fst/script/fst-class.h>
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#include <fst/script/weight-class.h>
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namespace fst {
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namespace script {
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struct DeterminizeOptions {
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const float delta;
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const WeightClass &weight_threshold;
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const int64_t state_threshold;
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const int64_t subsequential_label;
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const DeterminizeType det_type;
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const bool increment_subsequential_label;
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DeterminizeOptions(float delta, const WeightClass &weight_threshold,
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int64_t state_threshold = kNoStateId,
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int64_t subsequential_label = 0,
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DeterminizeType det_type = DETERMINIZE_FUNCTIONAL,
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bool increment_subsequential_label = false)
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: delta(delta),
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weight_threshold(weight_threshold),
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state_threshold(state_threshold),
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subsequential_label(subsequential_label),
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det_type(det_type),
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increment_subsequential_label(increment_subsequential_label) {}
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};
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using FstDeterminizeArgs =
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std::tuple<const FstClass &, MutableFstClass *, const DeterminizeOptions &>;
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template <class Arc>
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void Determinize(FstDeterminizeArgs *args) {
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using Weight = typename Arc::Weight;
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const Fst<Arc> &ifst = *std::get<0>(*args).GetFst<Arc>();
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MutableFst<Arc> *ofst = std::get<1>(*args)->GetMutableFst<Arc>();
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const auto &opts = std::get<2>(*args);
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const auto weight_threshold = *opts.weight_threshold.GetWeight<Weight>();
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const fst::DeterminizeOptions<Arc> detargs(
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opts.delta, weight_threshold, opts.state_threshold,
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opts.subsequential_label, opts.det_type,
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opts.increment_subsequential_label);
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Determinize(ifst, ofst, detargs);
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}
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void Determinize(const FstClass &ifst, MutableFstClass *ofst,
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const DeterminizeOptions &opts);
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} // namespace script
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} // namespace fst
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#endif // FST_SCRIPT_DETERMINIZE_H_
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