/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
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 *
 * This work was supported in part by funding from the Defense Advanced 
 * Research Projects Agency and the National Science Foundation of the 
 * United States of America, and the CMU Sphinx Speech Consortium.
 *
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/*
 * senone.h -- Mixture density weights associated with each tied state.
 *
 * **********************************************
 * CMU ARPA Speech Project
 *
 * Copyright (c) 1996 Carnegie Mellon University.
 * ALL RIGHTS RESERVED.
 * **********************************************
 * 
 * HISTORY
 * 
 * $Log$
 * Revision 1.1  2006/04/05  20:27:30  dhdfu
 * A Great Reorganzation of header files and executables
 * 
 * Revision 1.7  2006/02/22 17:27:39  arthchan2003
 * Merged from SPHINX3_5_2_RCI_IRII_BRANCH: 1, NOT doing truncation in the multi-stream GMM computation \n. 2, Added .s3cont. to be the alias of the old multi-stream GMM computation routine \n. 3, Added license \n.  4, Fixed dox-doc. \n
 *
 * Revision 1.6.4.4  2006/01/16 19:47:05  arthchan2003
 * Removed the truncation of senone probability code.
 *
 * Revision 1.6.4.3  2005/08/03 18:53:43  dhdfu
 * Add memory deallocation functions.  Also move all the initialization
 * of ms_mgau_model_t into ms_mgau_init (duh!), which entails removing it
 * from decode_anytopo and friends.
 *
 * Revision 1.6.4.2  2005/07/20 19:39:01  arthchan2003
 * Added licences in ms_* series of code.
 *
 * Revision 1.6.4.1  2005/07/05 05:47:59  arthchan2003
 * Fixed dox-doc. struct level of documentation are included.
 *
 * Revision 1.6  2005/06/21 19:00:19  arthchan2003
 * Add more detail comments  to ms_senone.h
 *
 * Revision 1.5  2005/06/21 18:57:31  arthchan2003
 * 1, Fixed doxygen documentation. 2, Added $ keyword.
 *
 * Revision 1.2  2005/06/13 04:02:56  archan
 * Fixed most doxygen-style documentation under libs3decoder.
 *
 * Revision 1.1.1.1  2005/03/24 15:24:00  archan
 * I found Evandro's suggestion is quite right after yelling at him 2 days later. So I decide to check this in again without any binaries. (I have done make distcheck. ) . Again, this is a candidate for s3.6 and I believe I need to work out 4-5 intermediate steps before I can complete the first prototype.  That's why I keep local copies. 
 *
 * Revision 1.4  2004/12/06 10:52:01  arthchan2003
 * Enable doxygen documentation in libs3decoder
 *
 * Revision 1.3  2004/11/13 21:25:19  arthchan2003
 * commit of 1, absolute CI-GMMS , 2, fast CI senone computation using svq, 3, Decrease the number of static variables, 4, fixing the random generator problem of vector_vqgen, 5, move all unused files to NOTUSED
 *
 * Revision 1.2  2004/08/31 08:43:47  arthchan2003
 * Fixing _cpluscplus directive
 *
 * Revision 1.1  2004/08/09 00:17:11  arthchan2003
 * Incorporating s3.0 align, at this point, there are still some small problems in align but they don't hurt. For example, the score doesn't match with s3.0 and the output will have problem if files are piped to /dev/null/. I think we can go for it.
 *
 * Revision 1.1  2003/02/14 14:40:34  cbq
 * Compiles.  Analysis is probably hosed.
 *
 * Revision 1.1  2000/04/24 09:39:41  lenzo
 * s3 import.
 *
 * 
 * 13-Dec-95	M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University.
 * 		Added senone_eval_all().
 * 
 * 12-Nov-95	M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University.
 * 		Created.
 */


#ifndef _LIBFBS_SENONE_H_
#define _LIBFBS_SENONE_H_


#include "s3types.h"
#include <logmath.h>
#include "ms_gauden.h"

/** \file ms_senone.h
 *  \brief (Sphinx 3.0 specific) multiple streams senones. used with ms_gauden.h
 *  In Sphinx 3.0 family of tools, ms_senone is used to combine the Gaussian scores.
 *  Its existence is crucial in Sphinx 3.0 because 3.0 supports both SCHMM and CDHMM. 
 *  There are optimization scheme for SCHMM (e.g. compute the top-N Gaussian) that is 
 *  applicable to SCHMM than CDHMM.  This is wrapped in senone_eval_all. 
 */

#ifdef __cplusplus
extern "C" {
#endif
#if 0
} /* Fool Emacs into not indenting things. */
#endif

typedef uint32 senprob_t;	/**< Senone logs3-probs, truncated to 8 bits */

/**
 * \struct senone_t
 * \brief 8-bit senone PDF structure. 
 * 
 * 8-bit senone PDF structure.  Senone pdf values are normalized, floored, converted to
 * logs3 domain, and finally truncated to 8 bits precision to conserve memory space.
 */
typedef struct {
    logmath_t *logmath;
    senprob_t ***pdf;		/**< gaussian density mixture weights, organized two possible
                                   ways depending on n_gauden:
                                   if (n_gauden > 1): pdf[sen][feat][codeword].  Not an
                                   efficient representation--memory access-wise--but
                                   evaluating the many codebooks will be more costly.
                                   if (n_gauden == 1): pdf[feat][codeword][sen].  Optimized
                                   for the shared-distribution semi-continuous case. */
    int32 n_sen;		/**< #senones in this set */
    int32 n_feat;		/**< #feature streams */ 
    int32 n_cw;			/**< #codewords per codebook,stream */
    int32 n_gauden;		/**< #gaussian density codebooks referred to by senones */
    float32 mixwfloor;		/**< floor applied to each PDF entry */
    int32 shift;		/**< LSB bits truncated from original logs3 value */
    s3mgauid_t *mgau;		/**< senone-id -> mgau-id mapping for senones in this set */
    int32* featscr;              /**< The feature score for every senone, will be initialized inside senone_eval_all */
} senone_t;


/**
 * Load a set of senones (mixing weights and mixture gaussian codebook mappings) from
 * the given files.  Normalize weights for each codebook, apply the given floor, convert
 * PDF values to logs3 domain and quantize to 8-bits.
 * @return pointer to senone structure created.  Caller MUST NOT change its contents.
 */
senone_t *senone_init (const char *mixwfile,		/**< In: mixing weights file */
		       const char *mgau_mapfile,	/**< In: file specifying mapping from each
			        			   senone to mixture gaussian codebook.
				        		   If NULL all senones map to codebook 0 */
		       float32 mixwfloor,	/**< In: Floor value for senone weights */
		       logmath_t *logmath
    );

/** Release memory allocated by senone_init. */
void senone_free(senone_t *s); /**< In: The senone_t to free */

/**
 * Evaluate the score for the given senone wrt to the given top N gaussian codewords.
 * @return senone score (in logs3 domain).
 */
int32 senone_eval (senone_t *s, s3senid_t id,	/**< In: senone for which score desired */
		   gauden_dist_t **dist,	/**< In: top N codewords and densities for
						   all features, to be combined into
						   senone score.  IE, dist[f][i] = i-th
						   best <codeword,density> for feaure f */
		   int32 n_top		/**< In: Length of dist[f], for each f */
    );

/**
 * Like senone_eval, but compute all senone scores for the shared density case (ie,
 * #codebooks = 1).
 */
void senone_eval_all (senone_t *s,		/**< In: Senone structure */
		      gauden_dist_t **dist,	/**< In: as in senone_eval above */
		      int32 n_top,		/**< In: as in senone_eval above */
		      int32 *senscr		/**< Out: Upon return, senscr[i] will contain
						   score for senone i */
    );

#if 0
{ /* Stop indent from complaining */
#endif
#ifdef __cplusplus
}
#endif

#endif
