/***      Author: Tapas Kanungo, kanungo@cfar.umd.edu**      Date:   15 December 1997**      File:   hmm.h**      Purpose: datastructures used for HMM. **      Organization: University of Maryland****	Update:**	Author: Tapas Kanungo**	Purpose: include <math.h>. Not including this was**		creating a problem with forward.c**      $Id: hmm.h,v 1.9 1999/05/02 18:38:11 kanungo Exp kanungo $*/#include <stdlib.h>#include <stdio.h>#include <math.h>typedef struct {	int N;		/* number of states;  Q={1,2,...,N} */	int M; 		/* number of observation symbols; V={1,2,...,M}*/	double	**A;	/* A[1..N][1..N]. a[i][j] is the transition prob			   of going from state i at time t to state j			   at time t+1 */	double	**B;	/* B[1..N][1..M]. b[j][k] is the probability of			   of observing symbol k in state j */	double	*pi;	/* pi[1..N] pi[i] is the initial state distribution. */} HMM;void ReadHMM(FILE *fp, HMM *phmm);void PrintHMM(FILE *fp, HMM *phmm);void InitHMM(HMM *phmm, int N, int M, int seed);void CopyHMM(HMM *phmm1, HMM *phmm2);void FreeHMM(HMM *phmm);void ReadSequence(FILE *fp, int *pT, int **pO);void PrintSequence(FILE *fp, int T, int *O);void GenSequenceArray(HMM *phmm, int seed, int T, int *O, int *q);int GenInitalState(HMM *phmm);int GenNextState(HMM *phmm, int q_t);int GenSymbol(HMM *phmm, int q_t); void Forward(HMM *phmm, int T, int *O, double **alpha, double *pprob);void ForwardWithScale(HMM *phmm, int T, int *O, double **alpha,        double *scale, double *pprob);void Backward(HMM *phmm, int T, int *O, double **beta, double *pprob);void BackwardWithScale(HMM *phmm, int T, int *O, double **beta,        double *scale, double *pprob);void BaumWelch(HMM *phmm, int T, int *O, double **alpha, double **beta,        double **gamma, int *niter, 	double *plogprobinit, double *plogprobfinal);double *** AllocXi(int T, int N);void FreeXi(double *** xi, int T, int N);void ComputeGamma(HMM *phmm, int T, double **alpha, double **beta,        double **gamma);void ComputeXi(HMM* phmm, int T, int *O, double **alpha, double **beta,        double ***xi);void Viterbi(HMM *phmm, int T, int *O, double **delta, int **psi,        int *q, double *pprob);void ViterbiLog(HMM *phmm, int T, int *O, double **delta, int **psi,        int *q, double *pprob);/* random number generator related functions*/int hmmgetseed(void);void hmmsetseed(int seed);double hmmgetrand(void); #define MAX(x,y)        ((x) > (y) ? (x) : (y))#define MIN(x,y)        ((x) < (y) ? (x) : (y))