53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
#ifndef _HMM_H
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#define _HMM_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* hmm.h
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*
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* Created by Mark Levy on 12/02/2006.
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* Copyright 2006 Centre for Digital Music, Queen Mary, University of London.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version. See the file
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COPYING included with this distribution for more information.
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*
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*/
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#ifndef PI
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#define PI 3.14159265358979323846264338327950288
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#endif
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typedef struct _model_t {
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int N; /* number of states */
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double* p0; /* initial probs */
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double** a; /* transition probs */
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int L; /* dimensionality of data */
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double** mu; /* state means */
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double** cov; /* covariance, tied between all states */
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} model_t;
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void hmm_train(double** x, int T, model_t* model); /* with scaling */
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void forward_backwards(double*** xi, double** gamma, double* loglik, double* loglik1, double* loglik2, int iter,
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int N, int T, double* p0, double** a, double** b);
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void baum_welch(double* p0, double** a, double** mu, double** cov, int N, int T, int L, double** x, double*** xi, double** gamma);
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void viterbi_decode(double** x, int T, model_t* model, int* q); /* using logs */
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model_t* hmm_init(double** x, int T, int L, int N);
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void hmm_close(model_t* model);
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void invert(double** cov, int L, double** icov, double* detcov); /* uses LAPACK (included with Mac OSX) */
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double gauss(double* x, int L, double* mu, double** icov, double detcov, double* y, double* z);
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double loggauss(double* x, int L, double* mu, double** icov, double detcov, double* y, double* z);
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void hmm_print(model_t* model);
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#ifdef __cplusplus
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}
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#endif
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#endif
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