diff options
Diffstat (limited to 'kaldi_io/src/kaldi/hmm')
| -rw-r--r-- | kaldi_io/src/kaldi/hmm/hmm-topology.h | 172 | ||||
| -rw-r--r-- | kaldi_io/src/kaldi/hmm/hmm-utils.h | 295 | ||||
| -rw-r--r-- | kaldi_io/src/kaldi/hmm/posterior.h | 214 | ||||
| -rw-r--r-- | kaldi_io/src/kaldi/hmm/transition-model.h | 345 | ||||
| -rw-r--r-- | kaldi_io/src/kaldi/hmm/tree-accu.h | 69 |
5 files changed, 0 insertions, 1095 deletions
diff --git a/kaldi_io/src/kaldi/hmm/hmm-topology.h b/kaldi_io/src/kaldi/hmm/hmm-topology.h deleted file mode 100644 index 53ca427..0000000 --- a/kaldi_io/src/kaldi/hmm/hmm-topology.h +++ /dev/null @@ -1,172 +0,0 @@ -// hmm/hmm-topology.h - -// Copyright 2009-2011 Microsoft Corporation - -// 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_HMM_TOPOLOGY_H_ -#define KALDI_HMM_HMM_TOPOLOGY_H_ - -#include "base/kaldi-common.h" -#include "tree/context-dep.h" -#include "util/const-integer-set.h" - - -namespace kaldi { - - -/// \addtogroup hmm_group -/// @{ - -/* - // The following would be the text form for the "normal" HMM topology. - // Note that the first state is the start state, and the final state, - // which must have no output transitions and must be nonemitting, has - // an exit probability of one (no other state can have nonzero exit - // probability; you can treat the transition probability to the final - // state as an exit probability). - // Note also that it's valid to omit the "<PdfClass>" entry of the <State>, which - // will mean we won't have a pdf on that state [non-emitting state]. This is equivalent - // to setting the <PdfClass> to -1. We do this normally just for the final state. - // The Topology object can have multiple <TopologyEntry> blocks. - // This is useful if there are multiple types of topology in the system. - - <Topology> - <TopologyEntry> - <ForPhones> 1 2 3 4 5 6 7 8 </ForPhones> - <State> 0 <PdfClass> 0 - <Transition> 0 0.5 - <Transition> 1 0.5 - </State> - <State> 1 <PdfClass> 1 - <Transition> 1 0.5 - <Transition> 2 0.5 - </State> - <State> 2 <PdfClass> 2 - <Transition> 2 0.5 - <Transition> 3 0.5 - <Final> 0.5 - </State> - <State> 3 - </State> - </TopologyEntry> - </Topology> -*/ - -// kNoPdf is used where pdf_class or pdf would be used, to indicate, -// none is there. Mainly useful in skippable models, but also used -// for end states. -// A caveat with nonemitting states is that their out-transitions -// are not trainable, due to technical issues with the way -// we decided to accumulate the stats. Any transitions arising from (*) -// HMM states with "kNoPdf" as the label are second-class transitions, -// They do not have "transition-states" or "transition-ids" associated -// with them. They are used to create the FST version of the -// HMMs, where they lead to epsilon arcs. -// (*) "arising from" is a bit of a technical term here, due to the way -// (if reorder == true), we put the transition-id associated with the -// outward arcs of the state, on the input transition to the state. - -/// A constant used in the HmmTopology class as the \ref pdf_class "pdf-class" -/// kNoPdf, which is used when a HMM-state is nonemitting (has no associated -/// PDF). - -static const int32 kNoPdf = -1; - -/// A class for storing topology information for phones. See \ref hmm for context. -/// This object is sometimes accessed in a file by itself, but more often -/// as a class member of the Transition class (this is for convenience to reduce -/// the number of files programs have to access). - -class HmmTopology { - public: - /// A structure defined inside HmmTopology to represent a HMM state. - struct HmmState { - /// The \ref pdf_class pdf-class, typically 0, 1 or 2 (the same as the HMM-state index), - /// but may be different to enable us to hardwire sharing of state, and may be - /// equal to \ref kNoPdf == -1 in order to specify nonemitting states (unusual). - int32 pdf_class; - - /// A list of transitions. The first member of each pair is the index of - /// the next HmmState, and the second is the default transition probability - /// (before training). - std::vector<std::pair<int32, BaseFloat> > transitions; - - explicit HmmState(int32 p): pdf_class(p) { } - - bool operator == (const HmmState &other) const { - return (pdf_class == other.pdf_class && transitions == other.transitions); - } - - HmmState(): pdf_class(-1) { } - }; - - /// TopologyEntry is a typedef that represents the topology of - /// a single (prototype) state. - typedef std::vector<HmmState> TopologyEntry; - - void Read(std::istream &is, bool binary); - void Write(std::ostream &os, bool binary) const; - - // Checks that the object is valid, and throw exception otherwise. - void Check(); - - - /// Returns the topology entry (i.e. vector of HmmState) for this phone; - /// will throw exception if phone not covered by the topology. - const TopologyEntry &TopologyForPhone(int32 phone) const; - - /// Returns the number of \ref pdf_class "pdf-classes" for this phone; - /// throws exception if phone not covered by this topology. - int32 NumPdfClasses(int32 phone) const; - - /// Returns a reference to a sorted, unique list of phones covered by - /// the topology (these phones will be positive integers, and usually - /// contiguous and starting from one but the toolkit doesn't assume - /// they are contiguous). - const std::vector<int32> &GetPhones() const { return phones_; }; - - /// Outputs a vector of int32, indexed by phone, that gives the - /// number of \ref pdf_class pdf-classes for the phones; this is - /// used by tree-building code such as BuildTree(). - void GetPhoneToNumPdfClasses(std::vector<int32> *phone2num_pdf_classes) const; - - HmmTopology() {} - - bool operator == (const HmmTopology &other) const { - return phones_ == other.phones_ && phone2idx_ == other.phone2idx_ - && entries_ == other.entries_; - } - // Allow default assignment operator and copy constructor. - private: - std::vector<int32> phones_; // list of all phones we have topology for. Sorted, uniq. no epsilon (zero) phone. - std::vector<int32> phone2idx_; // map from phones to indexes into the entries vector (or -1 for not present). - std::vector<TopologyEntry> entries_; -}; - - -/// This function returns a HmmTopology object giving a normal 3-state topology, -/// covering all phones in the list "phones". This is mainly of use in testing -/// code. -HmmTopology GetDefaultTopology(const std::vector<int32> &phones); - -/// @} end "addtogroup hmm_group" - - -} // end namespace kaldi - - -#endif diff --git a/kaldi_io/src/kaldi/hmm/hmm-utils.h b/kaldi_io/src/kaldi/hmm/hmm-utils.h deleted file mode 100644 index 240f706..0000000 --- a/kaldi_io/src/kaldi/hmm/hmm-utils.h +++ /dev/null @@ -1,295 +0,0 @@ -// hmm/hmm-utils.h - -// Copyright 2009-2011 Microsoft Corporation - -// 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_HMM_UTILS_H_ -#define KALDI_HMM_HMM_UTILS_H_ - -#include "hmm/hmm-topology.h" -#include "hmm/transition-model.h" -#include "lat/kaldi-lattice.h" - -namespace kaldi { - - -/// \defgroup hmm_group_graph Classes and functions for creating FSTs from HMMs -/// \ingroup hmm_group -/// @{ - -/// Configuration class for the GetHTransducer() function; see -/// \ref hmm_graph_config for context. -struct HTransducerConfig { - /// Transition log-prob scale, see \ref hmm_scale. - /// Note this doesn't apply to self-loops; GetHTransducer() does - /// not include self-loops. - BaseFloat transition_scale; - - /// if true, we are constructing time-reversed FST: phone-seqs in ilabel_info - /// are backwards, and we want to output a backwards version of the HMM - /// corresponding to each phone. If reverse == true, - bool reverse; - - /// This variable is only looked at if reverse == true. If reverse == true - /// and push_weights == true, then we push the weights in the reversed FSTs we create for each - /// phone HMM. This is only safe if the HMMs are probabilistic (i.e. not discriminatively - bool push_weights; - - /// delta used if we do push_weights [only relevant if reverse == true - /// and push_weights == true]. - BaseFloat push_delta; - - HTransducerConfig(): - transition_scale(1.0), - reverse(false), - push_weights(true), - push_delta(0.001) - { } - - // Note-- this Register registers the easy-to-register options - // but not the "sym_type" which is an enum and should be handled - // separately in main(). - void Register (OptionsItf *po) { - po->Register("transition-scale", &transition_scale, - "Scale of transition probs (relative to LM)"); - po->Register("reverse", &reverse, - "Set true to build time-reversed FST."); - po->Register("push-weights", &push_weights, - "Push weights (only applicable if reverse == true)"); - po->Register("push-delta", &push_delta, - "Delta used in pushing weights (only applicable if " - "reverse && push-weights"); - } -}; - - -struct HmmCacheHash { - int operator () (const std::pair<int32, std::vector<int32> >&p) const { - VectorHasher<int32> v; - int32 prime = 103049; - return prime*p.first + v(p.second); - } -}; - -/// HmmCacheType is a map from (central-phone, sequence of pdf-ids) to FST, used -/// as cache in GetHmmAsFst, as an optimization. -typedef unordered_map<std::pair<int32, std::vector<int32> >, - fst::VectorFst<fst::StdArc>*, - HmmCacheHash> HmmCacheType; - - -/// Called by GetHTransducer() and probably will not need to be called directly; -/// it creates the FST corresponding to the phone. Does not include self-loops; -/// you have to call AddSelfLoops() for that. Result owned by caller. -/// Returns an acceptor (i.e. ilabels, olabels identical) with transition-ids -/// as the symbols. -/// For documentation in context, see \ref hmm_graph_get_hmm_as_fst -/// @param context_window A vector representing the phonetic context; see -/// \ref tree_window "here" for explanation. -/// @param ctx_dep The object that contains the phonetic decision-tree -/// @param trans_model The transition-model object, which provides -/// the mappings to transition-ids and also the transition -/// probabilities. -/// @param config Configuration object, see \ref HTransducerConfig. -/// @param cache Object used as a lookaside buffer to save computation; -/// if it finds that the object it needs is already there, it will -/// just return a pointer value from "cache"-- not that this means -/// you have to be careful not to delete things twice. - -fst::VectorFst<fst::StdArc> *GetHmmAsFst( - std::vector<int32> context_window, - const ContextDependencyInterface &ctx_dep, - const TransitionModel &trans_model, - const HTransducerConfig &config, - HmmCacheType *cache = NULL); - -/// Included mainly as a form of documentation, not used in any other code -/// currently. Creates the FST with self-loops, and with fewer options. -fst::VectorFst<fst::StdArc>* -GetHmmAsFstSimple(std::vector<int32> context_window, - const ContextDependencyInterface &ctx_dep, - const TransitionModel &trans_model, - BaseFloat prob_scale); - - -/** - * Returns the H tranducer; result owned by caller. - * See \ref hmm_graph_get_h_transducer. The H transducer has on the - * input transition-ids, and also possibly some disambiguation symbols, which - * will be put in disambig_syms. The output side contains the identifiers that - * are indexes into "ilabel_info" (these represent phones-in-context or - * disambiguation symbols). The ilabel_info vector allows GetHTransducer to map - * from symbols to phones-in-context (i.e. phonetic context windows). Any - * singleton symbols in the ilabel_info vector which are not phones, will be - * treated as disambiguation symbols. [Not all recipes use these]. The output - * "disambig_syms_left" will be set to a list of the disambiguation symbols on - * the input of the transducer (i.e. same symbol type as whatever is on the - * input of the transducer - */ -fst::VectorFst<fst::StdArc>* -GetHTransducer (const std::vector<std::vector<int32> > &ilabel_info, - const ContextDependencyInterface &ctx_dep, - const TransitionModel &trans_model, - const HTransducerConfig &config, - std::vector<int32> *disambig_syms_left); - -/** - * GetIlabelMapping produces a mapping that's similar to HTK's logical-to-physical - * model mapping (i.e. the xwrd.clustered.mlist files). It groups together - * "logical HMMs" (i.e. in our world, phonetic context windows) that share the - * same sequence of transition-ids. This can be used in an - * optional graph-creation step that produces a remapped form of CLG that can be - * more productively determinized and minimized. This is used in the command-line program - * make-ilabel-transducer.cc. - * @param ilabel_info_old [in] The original \ref tree_ilabel "ilabel_info" vector - * @param ctx_dep [in] The tree - * @param trans_model [in] The transition-model object - * @param old2new_map [out] The output; this vector, which is of size equal to the - * number of new labels, is a mapping to the old labels such that we could - * create a vector ilabel_info_new such that - * ilabel_info_new[i] == ilabel_info_old[old2new_map[i]] - */ -void GetIlabelMapping (const std::vector<std::vector<int32> > &ilabel_info_old, - const ContextDependencyInterface &ctx_dep, - const TransitionModel &trans_model, - std::vector<int32> *old2new_map); - - - -/** - * For context, see \ref hmm_graph_add_self_loops. Expands an FST that has been - * built without self-loops, and adds the self-loops (it also needs to modify - * the probability of the non-self-loop ones, as the graph without self-loops - * was created in such a way that it was stochastic). Note that the - * disambig_syms will be empty in some recipes (e.g. if you already removed - * the disambiguation symbols). - * @param trans_model [in] Transition model - * @param disambig_syms [in] Sorted, uniq list of disambiguation symbols, required - * if the graph contains disambiguation symbols but only needed for sanity checks. - * @param self_loop_scale [in] Transition-probability scale for self-loops; c.f. - * \ref hmm_scale - * @param reorder [in] If true, reorders the transitions (see \ref hmm_reorder). - * @param fst [in, out] The FST to be modified. - */ -void AddSelfLoops(const TransitionModel &trans_model, - const std::vector<int32> &disambig_syms, // used as a check only. - BaseFloat self_loop_scale, - bool reorder, // true->dan-style, false->lukas-style. - fst::VectorFst<fst::StdArc> *fst); - -/** - * Adds transition-probs, with the supplied - * scales (see \ref hmm_scale), to the graph. - * Useful if you want to create a graph without transition probs, then possibly - * train the model (including the transition probs) but keep the graph fixed, - * and add back in the transition probs. It assumes the fst has transition-ids - * on it. It is not an error if the FST has no states (nothing will be done). - * @param trans_model [in] The transition model - * @param disambig_syms [in] A list of disambiguation symbols, required if the - * graph has disambiguation symbols on its input but only - * used for checks. - * @param transition_scale [in] A scale on transition-probabilities apart from - * those involving self-loops; see \ref hmm_scale. - * @param self_loop_scale [in] A scale on self-loop transition probabilities; - * see \ref hmm_scale. - * @param fst [in, out] The FST to be modified. - */ -void AddTransitionProbs(const TransitionModel &trans_model, - const std::vector<int32> &disambig_syms, - BaseFloat transition_scale, - BaseFloat self_loop_scale, - fst::VectorFst<fst::StdArc> *fst); - -/** - This is as AddSelfLoops(), but operates on a Lattice, where - it affects the graph part of the weight (the first element - of the pair). */ -void AddTransitionProbs(const TransitionModel &trans_model, - BaseFloat transition_scale, - BaseFloat self_loop_scale, - Lattice *lat); - - -/// Returns a transducer from pdfs plus one (input) to transition-ids (output). -/// Currenly of use only for testing. -fst::VectorFst<fst::StdArc>* -GetPdfToTransitionIdTransducer(const TransitionModel &trans_model); - -/// Converts all transition-ids in the FST to pdfs plus one. -/// Placeholder: not implemented yet! -void ConvertTransitionIdsToPdfs(const TransitionModel &trans_model, - const std::vector<int32> &disambig_syms, - fst::VectorFst<fst::StdArc> *fst); - -/// @} end "defgroup hmm_group_graph" - -/// \addtogroup hmm_group -/// @{ - -/// SplitToPhones splits up the TransitionIds in "alignment" into their -/// individual phones (one vector per instance of a phone). At output, -/// the sum of the sizes of the vectors in split_alignment will be the same -/// as the corresponding sum for "alignment". The function returns -/// true on success. If the alignment appears to be incomplete, e.g. -/// not ending at the end-state of a phone, it will still break it up into -/// phones but it will return false. For more serious errors it will -/// die or throw an exception. -/// This function works out by itself whether the graph was created -/// with "reordering" (dan-style graph), and just does the right thing. - -bool SplitToPhones(const TransitionModel &trans_model, - const std::vector<int32> &alignment, - std::vector<std::vector<int32> > *split_alignment); - -/// ConvertAlignment converts an alignment that was created using one -/// model, to another model. They must use a compatible topology (so we -/// know the state alignments of the new model). -/// It returns false if it could not be split to phones (probably -/// because the alignment was partial), but for other kinds of -/// error that are more likely a coding error, it will throw -/// an exception. -bool ConvertAlignment(const TransitionModel &old_trans_model, - const TransitionModel &new_trans_model, - const ContextDependencyInterface &new_ctx_dep, - const std::vector<int32> &old_alignment, - const std::vector<int32> *phone_map, // may be NULL - std::vector<int32> *new_alignment); - -// ConvertPhnxToProns is only needed in bin/phones-to-prons.cc and -// isn't closely related with HMMs, but we put it here as there isn't -// any other obvious place for it and it needs to be tested. -// This function takes a phone-sequence with word-start and word-end -// markers in it, and a word-sequence, and outputs the pronunciations -// "prons"... the format of "prons" is, each element is a vector, -// where the first element is the word (or zero meaning no word, e.g. -// for optional silence introduced by the lexicon), and the remaining -// elements are the phones in the word's pronunciation. -// It returns false if it encounters a problem of some kind, e.g. -// if the phone-sequence doesn't seem to have the right number of -// words in it. -bool ConvertPhnxToProns(const std::vector<int32> &phnx, - const std::vector<int32> &words, - int32 word_start_sym, - int32 word_end_sym, - std::vector<std::vector<int32> > *prons); - -/// @} end "addtogroup hmm_group" - -} // end namespace kaldi - - -#endif 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 diff --git a/kaldi_io/src/kaldi/hmm/transition-model.h b/kaldi_io/src/kaldi/hmm/transition-model.h deleted file mode 100644 index ccc4f11..0000000 --- a/kaldi_io/src/kaldi/hmm/transition-model.h +++ /dev/null @@ -1,345 +0,0 @@ -// hmm/transition-model.h - -// Copyright 2009-2012 Microsoft Corporation -// Johns Hopkins University (author: 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_TRANSITION_MODEL_H_ -#define KALDI_HMM_TRANSITION_MODEL_H_ - -#include "base/kaldi-common.h" -#include "tree/context-dep.h" -#include "util/const-integer-set.h" -#include "fst/fst-decl.h" // forward declarations. -#include "hmm/hmm-topology.h" -#include "itf/options-itf.h" - -namespace kaldi { - -/// \addtogroup hmm_group -/// @{ - -// The class TransitionModel is a repository for the transition probabilities. -// It also handles certain integer mappings. -// The basic model is as follows. Each phone has a HMM topology defined in -// hmm-topology.h. Each HMM-state of each of these phones has a number of -// transitions (and final-probs) out of it. Each HMM-state defined in the -// HmmTopology class has an associated "pdf_class". This gets replaced with -// an actual pdf-id via the tree. The transition model associates the -// transition probs with the (phone, HMM-state, pdf-id). We associate with -// each such triple a transition-state. Each -// transition-state has a number of associated probabilities to estimate; -// this depends on the number of transitions/final-probs in the topology for -// that (phone, HMM-state). Each probability has an associated transition-index. -// We associate with each (transition-state, transition-index) a unique transition-id. -// Each individual probability estimated by the transition-model is asociated with a -// transition-id. -// -// List of the various types of quantity referred to here and what they mean: -// phone: a phone index (1, 2, 3 ...) -// HMM-state: a number (0, 1, 2...) that indexes TopologyEntry (see hmm-topology.h) -// pdf-id: a number output by the Compute function of ContextDependency (it -// indexes pdf's). Zero-based. -// transition-state: the states for which we estimate transition probabilities for transitions -// out of them. In some topologies, will map one-to-one with pdf-ids. -// One-based, since it appears on FSTs. -// transition-index: identifier of a transition (or final-prob) in the HMM. Indexes the -// "transitions" vector in HmmTopology::HmmState. [if it is out of range, -// equal to transitions.size(), it refers to the final-prob.] -// Zero-based. -// transition-id: identifier of a unique parameter of the TransitionModel. -// Associated with a (transition-state, transition-index) pair. -// One-based, since it appears on FSTs. -// -// List of the possible mappings TransitionModel can do: -// (phone, HMM-state, pdf-id) -> transition-state -// (transition-state, transition-index) -> transition-id -// Reverse mappings: -// transition-id -> transition-state -// transition-id -> transition-index -// transition-state -> phone -// transition-state -> HMM-state -// transition-state -> pdf-id -// -// The main things the TransitionModel object can do are: -// Get initialized (need ContextDependency and HmmTopology objects). -// Read/write. -// Update [given a vector of counts indexed by transition-id]. -// Do the various integer mappings mentioned above. -// Get the probability (or log-probability) associated with a particular transition-id. - - -// Note: this was previously called TransitionUpdateConfig. -struct MleTransitionUpdateConfig { - BaseFloat floor; - BaseFloat mincount; - bool share_for_pdfs; // If true, share all transition parameters that have the same pdf. - MleTransitionUpdateConfig(BaseFloat floor = 0.01, - BaseFloat mincount = 5.0, - bool share_for_pdfs = false): - floor(floor), mincount(mincount), share_for_pdfs(share_for_pdfs) {} - - void Register (OptionsItf *po) { - po->Register("transition-floor", &floor, - "Floor for transition probabilities"); - po->Register("transition-min-count", &mincount, - "Minimum count required to update transitions from a state"); - po->Register("share-for-pdfs", &share_for_pdfs, - "If true, share all transition parameters where the states " - "have the same pdf."); - } -}; - -struct MapTransitionUpdateConfig { - BaseFloat tau; - bool share_for_pdfs; // If true, share all transition parameters that have the same pdf. - MapTransitionUpdateConfig(): tau(5.0), share_for_pdfs(false) { } - - void Register (OptionsItf *po) { - po->Register("transition-tau", &tau, "Tau value for MAP estimation of transition " - "probabilities."); - po->Register("share-for-pdfs", &share_for_pdfs, - "If true, share all transition parameters where the states " - "have the same pdf."); - } -}; - -class TransitionModel { - - public: - /// Initialize the object [e.g. at the start of training]. - /// The class keeps a copy of the HmmTopology object, but not - /// the ContextDependency object. - TransitionModel(const ContextDependency &ctx_dep, - const HmmTopology &hmm_topo); - - - /// Constructor that takes no arguments: typically used prior to calling Read. - TransitionModel() { } - - void Read(std::istream &is, bool binary); // note, no symbol table: topo object always read/written w/o symbols. - void Write(std::ostream &os, bool binary) const; - - - /// return reference to HMM-topology object. - const HmmTopology &GetTopo() const { return topo_; } - - /// \name Integer mapping functions |