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| author | Vsevolod Stakhov <vsevolod@highsecure.ru> | 2015-12-10 14:52:49 +0000 |
|---|---|---|
| committer | Vsevolod Stakhov <vsevolod@highsecure.ru> | 2015-12-10 14:52:49 +0000 |
| commit | 1aed295e93e1153bff796f9c2472f7e318ae1e28 (patch) | |
| tree | e780c04152dc7e2fa3f7ea80944c99dc7919880d /src/libstat/classifiers | |
| parent | 6da62c074de755c5c0a6da94d519255624d9b02b (diff) | |
| download | rspamd-1aed295e93e1153bff796f9c2472f7e318ae1e28.tar.gz rspamd-1aed295e93e1153bff796f9c2472f7e318ae1e28.zip | |
Normalize bayes scores
Diffstat (limited to 'src/libstat/classifiers')
| -rw-r--r-- | src/libstat/classifiers/bayes.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/libstat/classifiers/bayes.c b/src/libstat/classifiers/bayes.c index 3d16c05eb..180aa4658 100644 --- a/src/libstat/classifiers/bayes.c +++ b/src/libstat/classifiers/bayes.c @@ -169,6 +169,28 @@ bayes_classify_callback (gpointer key, gpointer value, gpointer data) return FALSE; } +/* + * A(x - 0.5)^4 + B(x - 0.5)^3 + C(x - 0.5)^2 + D(x - 0.5) + * A = 32, + * B = -6 + * C = -7 + * D = 3 + * y = 32(x - 0.5)^4 - 6(x - 0.5)^3 - 7(x - 0.5)^2 + 3(x - 0.5) + */ +static gdouble +bayes_normalize_prob (gdouble x) +{ + const gdouble a = 32, b = -6, c = -7, d = 3; + gdouble xx, x2, x3, x4; + + xx = x - 0.5; + x2 = xx * xx; + x3 = x2 * xx; + x4 = x3 * xx; + + return a*x4 + b*x3 + c*x2 + d*xx; +} + struct classifier_ctx * bayes_init (rspamd_mempool_t *pool, struct rspamd_classifier_config *cfg) { @@ -269,6 +291,8 @@ bayes_classify (struct classifier_ctx * ctx, } rspamd_snprintf (sumbuf, 32, "%.2f%%", final_prob * 100.); + final_prob = bayes_normalize_prob (final_prob); + cur = g_list_prepend (NULL, sumbuf); rspamd_task_insert_result (task, selected_st->st->symbol, |