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added: new algo for cmn #23
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@@ -4,6 +4,7 @@ libsphinxfeat_la_SOURCES = \ | |
| agc.c \ | ||
| cmn.c \ | ||
| cmn_prior.c \ | ||
| cmn_adapt.c \ | ||
| lda.c \ | ||
| feat.c | ||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,75 @@ | ||
| /* | ||
| * 16-Feb-2016 Zamir Ostroukhov <zamiron@gmail.com> | ||
| */ | ||
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| #ifdef HAVE_CONFIG_H | ||
| #include <config.h> | ||
| #endif | ||
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| #ifdef _MSC_VER | ||
| #pragma warning (disable: 4244) | ||
| #endif | ||
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| #include "sphinxbase/ckd_alloc.h" | ||
| #include "sphinxbase/cmn.h" | ||
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| void | ||
| cmn_adapt(cmn_t *cmn, mfcc_t **incep, int32 varnorm, int32 nfr) { | ||
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| int32 i, j; | ||
| mfcc_t cep_cur[cmn->veclen]; // check it please, is it correctly? | ||
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| if (nfr <= 0) | ||
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| return; | ||
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| for (j = 0; j < cmn->veclen; j++) { | ||
| cep_cur[j] = 0.0f; | ||
| for (i = 0; i < nfr; i++) | ||
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| if ( abs(incep[i][j]) > cep_cur[j] ) | ||
| cep_cur[j] = abs(incep[i][j]); | ||
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| if ( cep_cur[j] == 0.0f ) | ||
| cep_cur[j] = 0.0001f; | ||
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| if ( cmn->max[j] == 0.0f ) | ||
| cmn->max[j] = cep_cur[j] * 1.1f; | ||
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| if ( cep_cur[j] > cmn->max[j] * 2.0f ) { | ||
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Contributor
There was a problem hiding this comment. 2.0f is also not very reasonable constant here. Usually in proper code all constants are named to explain their meaning, for example:
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| cmn->max[j] = cep_cur[j] * 1.1f; | ||
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| } else { | ||
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| mfcc_t u_prob = ( cep_cur[j] / cmn->max[j] ) * 0.1f; | ||
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| if ( u_prob > 0.1f ) | ||
| u_prob = 0.1f; | ||
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| cmn->max[j] = cep_cur[j] * u_prob + cmn->max[j] * (1.0f-u_prob); | ||
| } | ||
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| } | ||
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| mfcc_t prob0 = ( cep_cur[0] / cmn->max[0] ) * 0.01f; | ||
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| if ( prob0 > 0.01 ) | ||
| prob0 = 0.01f; | ||
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| for (i = 0; i < nfr; i++) { | ||
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| if ( cep_cur[0] > cmn->max[0] ) | ||
| cmn->max[0] = cep_cur[0] * prob0 + cmn->max[0] * (1.0f-prob0); | ||
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| mfcc_t e_prob = incep[i][0] / cmn->max[0] * 0.001f; | ||
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Contributor
There was a problem hiding this comment. What does 0.001f mean here. Also please note that mfcc_t can be a fixed point number (int) in fixed point mode, floating point operation is not easy here. |
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| for (j = 0; j < cmn->veclen; j++) { | ||
| cmn->sum[j] += incep[i][j]; // save compatibility with prior method, you can to remove it | ||
| cmn->cmn_mean[j] = ( incep[i][j] * e_prob ) + ( cmn->cmn_mean[j] * (1.0f-e_prob) ); | ||
| incep[i][j] -= cmn->cmn_mean[j]; | ||
| if (varnorm) | ||
| incep[i][j] /= cmn->max[j]; | ||
| } | ||
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| ++cmn->nframe; // save compatibility with prior method, you can to remove it | ||
| } | ||
| } | ||
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You can not allocate arrays in plan C, it's better to preallocate it like cep_max