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// decoder/decodable-mapped.h
// Copyright 2009-2011 Saarland University; Microsoft Corporation;
// Lukas Burget
// 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_DECODER_DECODABLE_MAPPED_H_
#define KALDI_DECODER_DECODABLE_MAPPED_H_
#include <vector>
#include "base/kaldi-common.h"
#include "itf/decodable-itf.h"
namespace kaldi {
// The DecodableMapped object is initialized by a normal decodable object,
// and a vector that maps indices. The "pdf index" into this decodable object
// is the index into the vector, and the value it finds there is used
// to index into the base decodable object.
class DecodableMapped: public DecodableInterface {
public:
DecodableMapped(const std::vector<int32> &index_map, DecodableInterface *d):
index_map_(index_map), decodable_(d) { }
// Note, frames are numbered from zero. But state_index is numbered
// from one (this routine is called by FSTs).
virtual BaseFloat LogLikelihood(int32 frame, int32 state_index) {
KALDI_ASSERT(static_cast<size_t>(state_index) < index_map_.size());
return decodable_->LogLikelihood(frame, index_map_[state_index]);
}
// note: indices are assumed to be numbered from one, so
// NumIndices() will be the same as the largest index.
virtual int32 NumIndices() const { return static_cast<int32>(index_map_.size()) - 1; }
virtual bool IsLastFrame(int32 frame) const {
// We require all the decodables have the same #frames. We don't check this though.
return decodable_->IsLastFrame(frame);
}
private:
std::vector<int32> index_map_;
DecodableInterface *decodable_;
KALDI_DISALLOW_COPY_AND_ASSIGN(DecodableMapped);
};
} // namespace kaldi
#endif // KALDI_DECODER_DECODABLE_MAPPED_H_
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