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// nnet/nnet-pdf-prior.h
// Copyright 2013 Brno University of Technology (Author: Karel Vesely)
// 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_NNET_NNET_PDF_PRIOR_H_
#define KALDI_NNET_NNET_PDF_PRIOR_H_
#include <cfloat>
#include <string>
#include "base/kaldi-common.h"
#include "util/common-utils.h"
#include "matrix/matrix-lib.h"
#include "cudamatrix/cu-matrix.h"
#include "cudamatrix/cu-vector.h"
namespace kaldi {
namespace nnet1 {
struct PdfPriorOptions {
std::string class_frame_counts;
BaseFloat prior_scale;
BaseFloat prior_floor;
PdfPriorOptions():
class_frame_counts(""),
prior_scale(1.0),
prior_floor(1e-10)
{ }
void Register(OptionsItf *opts) {
opts->Register("class-frame-counts", &class_frame_counts,
"Vector with frame-counts of pdfs to compute log-priors."
" (priors are typically subtracted from log-posteriors"
" or pre-softmax activations)");
opts->Register("prior-scale", &prior_scale,
"Scaling factor to be applied on pdf-log-priors");
opts->Register("prior-floor", &prior_floor,
"Flooring constatnt for prior probability "
"(i.e. label rel. frequency)");
}
};
class PdfPrior {
public:
/// Initialize pdf-prior from options
explicit PdfPrior(const PdfPriorOptions &opts);
/// Subtract pdf priors from log-posteriors to get pseudo log-likelihoods
void SubtractOnLogpost(CuMatrixBase<BaseFloat> *llk);
private:
BaseFloat prior_scale_;
CuVector<BaseFloat> log_priors_;
KALDI_DISALLOW_COPY_AND_ASSIGN(PdfPrior);
};
} // namespace nnet1
} // namespace kaldi
#endif // KALDI_NNET_NNET_PDF_PRIOR_H_
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