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// lm/kaldi-rnnlm.h
// Copyright 2015 Guoguo Chen
// 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_LM_KALDI_RNNLM_H_
#define KALDI_LM_KALDI_RNNLM_H_
#include <string>
#include <vector>
#include "base/kaldi-common.h"
#include "fstext/deterministic-fst.h"
#include "lm/mikolov-rnnlm-lib.h"
#include "util/common-utils.h"
namespace kaldi {
struct KaldiRnnlmWrapperOpts {
std::string unk_symbol;
std::string eos_symbol;
KaldiRnnlmWrapperOpts() : unk_symbol("<RNN_UNK>"), eos_symbol("</s>") {}
void Register(OptionsItf *opts) {
opts->Register("unk-symbol", &unk_symbol, "Symbol for out-of-vocabulary "
"words in rnnlm.");
opts->Register("eos-symbol", &eos_symbol, "End of setence symbol in "
"rnnlm.");
}
};
class KaldiRnnlmWrapper {
public:
KaldiRnnlmWrapper(const KaldiRnnlmWrapperOpts &opts,
const std::string &unk_prob_rspecifier,
const std::string &word_symbol_table_rxfilename,
const std::string &rnnlm_rxfilename);
int32 GetHiddenLayerSize() const { return rnnlm_.getHiddenLayerSize(); }
int32 GetEos() const { return eos_; }
BaseFloat GetLogProb(int32 word, const std::vector<int32> &wseq,
const std::vector<float> &context_in,
std::vector<float> *context_out);
private:
rnnlm::CRnnLM rnnlm_;
std::vector<std::string> label_to_word_;
int32 eos_;
KALDI_DISALLOW_COPY_AND_ASSIGN(KaldiRnnlmWrapper);
};
class RnnlmDeterministicFst
: 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.
RnnlmDeterministicFst(int32 max_ngram_order, KaldiRnnlmWrapper *rnnlm);
// 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_;
MapType wseq_to_state_;
std::vector<std::vector<Label> > state_to_wseq_;
KaldiRnnlmWrapper *rnnlm_;
int32 max_ngram_order_;
std::vector<std::vector<float> > state_to_context_;
};
} // namespace kaldi
#endif // KALDI_LM_KALDI_RNNLM_H_
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