[Minor] Use log2 as it is slightly faster

diff --git a/src/libstat/classifiers/bayes.c b/src/libstat/classifiers/bayes.c
index 40dcdf36fa317ea862cfbef9c60a3e64ad4b4ae9..35e061e08a2313df5290594e333ebab5918c28fd 100644 (file)
--- a/src/libstat/classifiers/bayes.c
+++ b/src/libstat/classifiers/bayes.c
@@ -140,6 +140,7 @@ bayes_classify_token (struct rspamd_classifier *ctx,
                fw = feature_weight[tok->window_idx % G_N_ELEMENTS (feature_weight)];
                norm_sum = (spam_freq + ham_freq) * (spam_freq + ham_freq);
                norm_sub = (spam_freq - ham_freq) * (spam_freq - ham_freq);
+
                w = (norm_sub) / (norm_sum) *
                                (fw * total_count) / (4.0 * (1.0 + fw * total_count));
                bayes_spam_prob = PROB_COMBINE (spam_prob, total_count, w, 0.5);
@@ -147,8 +148,9 @@ bayes_classify_token (struct rspamd_classifier *ctx,
                w = (norm_sub) / (norm_sum) *
                                (fw * total_count) / (4.0 * (1.0 + fw * total_count));
                bayes_ham_prob = PROB_COMBINE (ham_prob, total_count, w, 0.5);
-               cl->spam_prob += log (bayes_spam_prob);
-               cl->ham_prob += log (bayes_ham_prob);
+
+               cl->spam_prob += log2 (bayes_spam_prob);
+               cl->ham_prob += log2 (bayes_ham_prob);
                cl->processed_tokens ++;
 
                msg_debug_bayes ("token: weight: %f, total_count: %L, "