/usr/include/torch/DecodingHMM.h is in libtorch3-dev 3.1-2.1.
This file is owned by root:root, with mode 0o644.
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//
// This file is part of Torch 3.1.
//
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#ifndef DECODINGHMM_INC
#define DECODINGHMM_INC
#include "general.h"
#include "Distribution.h"
#include "HMM.h"
namespace Torch {
/* This structure is used to store all HMM state information
required for decoding. Each state contains a list of successor
states and associated transition probabilities.
@author Darren Moore (moore@idiap.ch)
*/
typedef struct
{
Distribution *distribution ;
short emission_prob_vec_index ;
short n_successors ;
short *successor_states ;
real *suc_log_trans_probs ;
} DecodingHMMState ;
/** This class contains all HMM information required for decoding. Most information
is embedded in the states themselves (DecodingHMMState structures). The DecodingHMM
can be created a number of ways to facilitate compatibility with the Torch HMM class
and to allow easy concatenation of models (eg. when constructing word models from
phoneme models).
@author Darren Moore (moore@idiap.ch)
*/
class DecodingHMM
{
public:
short n_states ;
DecodingHMMState **states ;
/* Constructors / destructor */
DecodingHMM() ;
/// Converts a Torch HMM instance to a DecodingHMM representation. The Torch HMM
/// class contains a lot of member variables used in training that are not
/// required when decoding, as well as a full transition matrix.
DecodingHMM( HMM *orig_model , short *emis_prob_vec_indices ) ;
/// Concatenates all elements in the array of DecodingHMM instances into a single
/// DecodingHMM. Component models that have initial-final state transitions are ok.
DecodingHMM( int n_models , DecodingHMM **models ) ;
/// Creates a DecodingHMM using the distributions in 'states_' and the log
/// transition probabilties in 'log_trans_probs_'.
DecodingHMM( short n_states_ , Distribution **states_ , real **log_trans_probs_ ,
short *emis_prob_vec_indices ) ;
virtual ~DecodingHMM() ;
/* Methods */
/// Internal function to merge component models into a big HMM
void mergeModels( int n_models , DecodingHMM **models ) ;
/// Configures successor state information for the state denoted by 'state'.
void setupSuccessorStates( DecodingHMMState *state , short n_successors_ ,
short *sucessor_states_ , real *log_trans_probs_ ) ;
/// Initialises the state denoted by 'state' with a Distribution and
/// optionally an index into the vector of emission probabilities.
void initState( DecodingHMMState *state , Distribution *distribution_ ,
short emission_prob_vec_index_=-1 ) ;
#ifdef DEBUG
void outputText() ;
#endif
} ;
}
#endif
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