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src/rnnlm/rnnlm-lattice-rescoring.h
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// rnnlm/rnnlm-lattice-rescoring.h
//
// Copyright 2017 Johns Hopkins University (author: Daniel Povey)
// 2017 Yiming Wang
// 2017 Hainan Xu
//
// See ../../COPYING for clarification regarding multiple authors
//
// 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
//
// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
// MERCHANTABLITY OR NON-INFRINGEMENT.
// See the Apache 2 License for the specific language governing permissions and
// limitations under the License.
#ifndef KALDI_RNNLM_RNNLM_LATTICE_RESCORING_H_
#define KALDI_RNNLM_RNNLM_LATTICE_RESCORING_H_
#include <string>
#include <vector>
#include "base/kaldi-common.h"
#include "fstext/deterministic-fst.h"
#include "rnnlm/rnnlm-compute-state.h"
#include "util/common-utils.h"
namespace kaldi {
namespace rnnlm {
class KaldiRnnlmDeterministicFst
: public fst::DeterministicOnDemandFst<fst::StdArc> {
public:
typedef fst::StdArc::Weight Weight;
typedef fst::StdArc::StateId StateId;
typedef fst::StdArc::Label Label;
// Does not take ownership.
KaldiRnnlmDeterministicFst(int32 max_ngram_order,
const RnnlmComputeStateInfo &info);
~KaldiRnnlmDeterministicFst();
void Clear();
// We cannot use "const" because the pure virtual function in the interface is
// not const.
virtual StateId Start() { return start_state_; }
// We cannot use "const" because the pure virtual function in the interface is
// not const.
virtual Weight Final(StateId s);
virtual bool GetArc(StateId s, Label ilabel, fst::StdArc* oarc);
private:
typedef unordered_map
<std::vector<Label>, StateId, VectorHasher<Label> > MapType;
StateId start_state_;
int32 max_ngram_order_;
int32 bos_index_;
int32 eos_index_;
MapType wseq_to_state_;
// Mapping from state-id to history sequence>
std::vector<std::vector<Label> > state_to_wseq_;
// Mapping from state-id to RNNLM states.
// The pointers are owned in this class
std::vector<RnnlmComputeState*> state_to_rnnlm_state_;
};
} // namespace rnnlm
} // namespace kaldi
#endif // KALDI_RNNLM_RNNLM_LATTICE_RESCORING_H_
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