[Rspamd] Add neural module and define its scores

data/conf/rspamd/local.d/neural.conf

@@ -0,0 +1,28 @@
+rules {
+  "LONG" {
+    train {
+      max_trains = 800;
+      max_usages = 20;
+      max_iterations = 25;
+      learning_rate = 0.01,
+      spam_score = 9;
+      ham_score = -4;
+    }
+    symbol_spam = "NEURAL_SPAM_LONG";
+    symbol_ham = "NEURAL_HAM_LONG";
+    ann_expire = 100d;
+  }
+  "SHORT" {
+    train {
+      max_trains = 90;
+      max_usages = 2;
+      max_iterations = 25;
+      learning_rate = 0.02,
+      spam_score = 9;
+      ham_score = -4;
+    }
+    symbol_spam = "NEURAL_SPAM_SHORT";
+    symbol_ham = "NEURAL_HAM_SHORT";
+    ann_expire = 7d;
+  }
+}

data/conf/rspamd/local.d/neural_group.conf

@@ -0,0 +1,18 @@
+symbols = {
+  "NEURAL_SPAM_LONG" {
+    weight = 4.2; # sample weight
+    description = "Neural network spam (long)";
+  }
+  "NEURAL_HAM_LONG" {
+    weight = -4.0; # sample weight
+    description = "Neural network ham (long)";
+  }
+  "NEURAL_SPAM_SHORT" {
+    weight = 3.0; # sample weight
+    description = "Neural network spam (short)";
+  }
+  "NEURAL_HAM_SHORT" {
+    weight = -2.0; # sample weight
+    description = "Neural network ham (short)";
+  }
+}