diff options
Diffstat (limited to 'kaldi_io/src/kaldi/hmm/posterior.h')
| -rw-r--r-- | kaldi_io/src/kaldi/hmm/posterior.h | 214 |
1 files changed, 0 insertions, 214 deletions
diff --git a/kaldi_io/src/kaldi/hmm/posterior.h b/kaldi_io/src/kaldi/hmm/posterior.h deleted file mode 100644 index be73be9..0000000 --- a/kaldi_io/src/kaldi/hmm/posterior.h +++ /dev/null @@ -1,214 +0,0 @@ -// hmm/posterior.h - -// Copyright 2009-2011 Microsoft Corporation -// 2013-2014 Johns Hopkins University (author: Daniel Povey) -// 2014 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_HMM_POSTERIOR_H_ -#define KALDI_HMM_POSTERIOR_H_ - -#include "base/kaldi-common.h" -#include "tree/context-dep.h" -#include "util/const-integer-set.h" -#include "util/kaldi-table.h" -#include "hmm/transition-model.h" - - -namespace kaldi { - - -/// \addtogroup posterior_group -/// @{ - -/// Posterior is a typedef for storing acoustic-state (actually, transition-id) -/// posteriors over an utterance. The "int32" is a transition-id, and the BaseFloat -/// is a probability (typically between zero and one). -typedef std::vector<std::vector<std::pair<int32, BaseFloat> > > Posterior; - -/// GaussPost is a typedef for storing Gaussian-level posteriors for an utterance. -/// the "int32" is a transition-id, and the Vector<BaseFloat> is a vector of -/// Gaussian posteriors. -/// WARNING: We changed "int32" from transition-id to pdf-id, and the change is -/// applied for all programs using GaussPost. This is for efficiency purpose. We -/// also changed the name slightly from GauPost to GaussPost to reduce the -/// chance that the change will go un-noticed in downstream code. -typedef std::vector<std::vector<std::pair<int32, Vector<BaseFloat> > > > GaussPost; - - -// PosteriorHolder is a holder for Posterior, which is -// std::vector<std::vector<std::pair<int32, BaseFloat> > > -// This is used for storing posteriors of transition id's for an -// utterance. -class PosteriorHolder { - public: - typedef Posterior T; - - PosteriorHolder() { } - - static bool Write(std::ostream &os, bool binary, const T &t); - - void Clear() { Posterior tmp; std::swap(tmp, t_); } - - // Reads into the holder. - bool Read(std::istream &is); - - // Kaldi objects always have the stream open in binary mode for - // reading. - static bool IsReadInBinary() { return true; } - - const T &Value() const { return t_; } - - private: - KALDI_DISALLOW_COPY_AND_ASSIGN(PosteriorHolder); - T t_; -}; - - -// GaussPostHolder is a holder for GaussPost, which is -// std::vector<std::vector<std::pair<int32, Vector<BaseFloat> > > > -// This is used for storing posteriors of transition id's for an -// utterance. -class GaussPostHolder { - public: - typedef GaussPost T; - - GaussPostHolder() { } - - static bool Write(std::ostream &os, bool binary, const T &t); - - void Clear() { GaussPost tmp; std::swap(tmp, t_); } - - // Reads into the holder. - bool Read(std::istream &is); - - // Kaldi objects always have the stream open in binary mode for - // reading. - static bool IsReadInBinary() { return true; } - - const T &Value() const { return t_; } - - private: - KALDI_DISALLOW_COPY_AND_ASSIGN(GaussPostHolder); - T t_; -}; - - -// Posterior is a typedef: vector<vector<pair<int32, BaseFloat> > >, -// representing posteriors over (typically) transition-ids for an -// utterance. -typedef TableWriter<PosteriorHolder> PosteriorWriter; -typedef SequentialTableReader<PosteriorHolder> SequentialPosteriorReader; -typedef RandomAccessTableReader<PosteriorHolder> RandomAccessPosteriorReader; - - -// typedef std::vector<std::vector<std::pair<int32, Vector<BaseFloat> > > > GaussPost; -typedef TableWriter<GaussPostHolder> GaussPostWriter; -typedef SequentialTableReader<GaussPostHolder> SequentialGaussPostReader; -typedef RandomAccessTableReader<GaussPostHolder> RandomAccessGaussPostReader; - - -/// Scales the BaseFloat (weight) element in the posterior entries. -void ScalePosterior(BaseFloat scale, Posterior *post); - -/// Returns the total of all the weights in "post". -BaseFloat TotalPosterior(const Posterior &post); - -/// Returns true if the two lists of pairs have no common .first element. -bool PosteriorEntriesAreDisjoint( - const std::vector<std::pair<int32, BaseFloat> > &post_elem1, - const std::vector<std::pair<int32, BaseFloat> > &post_elem2); - - -/// Merge two sets of posteriors, which must have the same length. If "merge" -/// is true, it will make a common entry whenever there are duplicated entries, -/// adding up the weights. If "drop_frames" is true, for frames where the -/// two sets of posteriors were originally disjoint, makes no entries for that -/// frame (relates to frame dropping, or drop_frames, see Vesely et al, ICASSP -/// 2013). Returns the number of frames for which the two posteriors were -/// disjoint (i.e. no common transition-ids or whatever index we are using). -int32 MergePosteriors(const Posterior &post1, - const Posterior &post2, - bool merge, - bool drop_frames, - Posterior *post); - -/// Given a vector of log-likelihoods (typically of Gaussians in a GMM -/// but could be of pdf-ids), a number gselect >= 1 and a minimum posterior -/// 0 <= min_post < 1, it gets the posterior for each element of log-likes -/// by applying Softmax(), then prunes the posteriors using "gselect" and -/// "min_post" (keeping at least one), and outputs the result into -/// "post_entry", sorted from greatest to least posterior. -/// Returns the total log-likelihood (the output of calling ApplySoftMax() -/// on a copy of log_likes). -BaseFloat VectorToPosteriorEntry( - const VectorBase<BaseFloat> &log_likes, - int32 num_gselect, - BaseFloat min_post, - std::vector<std::pair<int32, BaseFloat> > *post_entry); - -/// Convert an alignment to a posterior (with a scale of 1.0 on -/// each entry). -void AlignmentToPosterior(const std::vector<int32> &ali, - Posterior *post); - -/// Sorts posterior entries so that transition-ids with same pdf-id are next to -/// each other. -void SortPosteriorByPdfs(const TransitionModel &tmodel, - Posterior *post); - - -/// Converts a posterior over transition-ids to be a posterior -/// over pdf-ids. -void ConvertPosteriorToPdfs(const TransitionModel &tmodel, - const Posterior &post_in, - Posterior *post_out); - -/// Converts a posterior over transition-ids to be a posterior -/// over phones. -void ConvertPosteriorToPhones(const TransitionModel &tmodel, - const Posterior &post_in, - Posterior *post_out); - -/// Weight any silence phones in the posterior (i.e. any phones -/// in the set "silence_set" by scale "silence_scale". -/// The interface was changed in Feb 2014 to do the modification -/// "in-place" rather than having separate input and output. -void WeightSilencePost(const TransitionModel &trans_model, - const ConstIntegerSet<int32> &silence_set, - BaseFloat silence_scale, - Posterior *post); - -/// This is similar to WeightSilencePost, except that on each frame it -/// works out the amount by which the overall posterior would be reduced, -/// and scales down everything on that frame by the same amount. It -/// has the effect that frames that are mostly silence get down-weighted. -/// The interface was changed in Feb 2014 to do the modification -/// "in-place" rather than having separate input and output. -void WeightSilencePostDistributed(const TransitionModel &trans_model, - const ConstIntegerSet<int32> &silence_set, - BaseFloat silence_scale, - Posterior *post); - -/// @} end "addtogroup posterior_group" - - -} // end namespace kaldi - - -#endif |