// decoder/decodable-mapped.h
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// Copyright 2009-2011 Saarland University; Microsoft Corporation;
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// Lukas Burget
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// See ../../COPYING for clarification regarding multiple authors
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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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// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
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// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
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// MERCHANTABLITY OR NON-INFRINGEMENT.
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// See the Apache 2 License for the specific language governing permissions and
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// limitations under the License.
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#ifndef KALDI_DECODER_DECODABLE_MAPPED_H_
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#define KALDI_DECODER_DECODABLE_MAPPED_H_
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#include <vector>
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#include "base/kaldi-common.h"
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#include "itf/decodable-itf.h"
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namespace kaldi {
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// The DecodableMapped object is initialized by a normal decodable object,
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// and a vector that maps indices. The "pdf index" into this decodable object
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// is the index into the vector, and the value it finds there is used
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// to index into the base decodable object.
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class DecodableMapped: public DecodableInterface {
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public:
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DecodableMapped(const std::vector<int32> &index_map, DecodableInterface *d):
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index_map_(index_map), decodable_(d) { }
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// Note, frames are numbered from zero. But state_index is numbered
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// from one (this routine is called by FSTs).
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virtual BaseFloat LogLikelihood(int32 frame, int32 state_index) {
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KALDI_ASSERT(static_cast<size_t>(state_index) < index_map_.size());
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return decodable_->LogLikelihood(frame, index_map_[state_index]);
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}
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// note: indices are assumed to be numbered from one, so
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// NumIndices() will be the same as the largest index.
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virtual int32 NumIndices() const { return static_cast<int32>(index_map_.size()) - 1; }
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virtual bool IsLastFrame(int32 frame) const {
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// We require all the decodables have the same #frames. We don't check this though.
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return decodable_->IsLastFrame(frame);
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}
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private:
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std::vector<int32> index_map_;
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DecodableInterface *decodable_;
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KALDI_DISALLOW_COPY_AND_ASSIGN(DecodableMapped);
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};
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} // namespace kaldi
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#endif // KALDI_DECODER_DECODABLE_MAPPED_H_
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