From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Fri, 16 Nov 2018 09:28:40 +0000 (+0000)
Subject: [Minor] Fix formula
X-Git-Tag: 1.8.2~22
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3cb9102e94d6e3017c9573e2d778ac49a5de64fe;p=thirdparty%2Frspamd.git

[Minor] Fix formula
---

diff --git a/src/libstat/classifiers/bayes.c b/src/libstat/classifiers/bayes.c
index 2e710522bc..5295e018b9 100644
--- a/src/libstat/classifiers/bayes.c
+++ b/src/libstat/classifiers/bayes.c
@@ -344,22 +344,22 @@ bayes_classify (struct rspamd_classifier * ctx,
 		return TRUE;
 	}
 
-	if (cl.spam_prob < -300 && cl.ham_prob < -300) {
+	if (cl.spam_prob > -300 && cl.ham_prob > -300) {
 		/* Fisher value is low enough to apply inv_chi_square */
 		h = 1 - inv_chi_square (task, cl.spam_prob, cl.processed_tokens);
 		s = 1 - inv_chi_square (task, cl.ham_prob, cl.processed_tokens);
 	}
 	else {
 		/* Use naive method */
-		if (cl.spam_prob > cl.ham_prob) {
-			s = (1.0 - exp(cl.spam_prob / cl.ham_prob)) /
-					(1.0 + exp(cl.spam_prob / cl.ham_prob));
-			h = 1.0 - s;
+		if (cl.spam_prob < cl.ham_prob) {
+			h = (1.0 - exp(cl.spam_prob - cl.ham_prob)) /
+					(1.0 + exp(cl.spam_prob - cl.ham_prob));
+			s = 1.0 - h;
 		}
 		else {
-			h = (1.0 - exp(cl.ham_prob / cl.spam_prob)) /
-				(1.0 + exp(cl.ham_prob / cl.spam_prob));
-			s = 1.0 - h;
+			s = (1.0 - exp(cl.ham_prob - cl.spam_prob)) /
+				(1.0 + exp(cl.ham_prob - cl.spam_prob));
+			h = 1.0 - s;
 		}
 	}