libtorch-runtime/kaldi/fst/script/reweight.h

// Copyright 2005-2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the 'License');
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an 'AS IS' BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.

#ifndef FST_SCRIPT_REWEIGHT_H_
#define FST_SCRIPT_REWEIGHT_H_

#include <tuple>
#include <vector>

#include <fst/mutable-fst.h>
#include <fst/reweight.h>
#include <fst/script/fst-class.h>
#include <fst/script/script-impl.h>
#include <fst/script/weight-class.h>

namespace fst {
namespace script {

using FstReweightArgs =
    std::tuple<MutableFstClass *, const std::vector<WeightClass> &,
               ReweightType>;

template <class Arc>
void Reweight(FstReweightArgs *args) {
  using Weight = typename Arc::Weight;
  MutableFst<Arc> *fst = std::get<0>(*args)->GetMutableFst<Arc>();
  const std::vector<WeightClass> &potentials = std::get<1>(*args);
  std::vector<Weight> typed_potentials;
  internal::CopyWeights(potentials, &typed_potentials);
  Reweight(fst, typed_potentials, std::get<2>(*args));
}

void Reweight(MutableFstClass *fst, const std::vector<WeightClass> &potentials,
              ReweightType reweight_type);

}  // namespace script
}  // namespace fst

#endif  // FST_SCRIPT_REWEIGHT_H_