[Fix] Prefer higher version ANN profiles when symbol distances are equal

When multiple ANN profiles have the same symbol distance, the profile
selection would pick the first one encountered rather than the newest.
This caused issues when a newly trained ANN (version 1) existed alongside
the initial profile (version 0) - the scanner would select version 0
which had no actual ANN data.

Fix by adding a secondary selection criterion: when distances are equal,
prefer the profile with the higher version number.

diff --git a/src/plugins/lua/neural.lua b/src/plugins/lua/neural.lua
index 231c0c7163e8c016b1a07aec34982d1037c49089..f54ea1a5e6efbb0f79ab2572b001f02d64bb111b 100644 (file)
--- a/src/plugins/lua/neural.lua
+++ b/src/plugins/lua/neural.lua
@@ -754,7 +754,8 @@ local function process_existing_ann(_, ev_base, rule, set, profiles)
       local dist = lua_util.distance_sorted(elt.symbols, my_symbols)
       -- Check distance
       if dist < #my_symbols * .3 then
-        if dist < min_diff then
+        -- Prefer profiles with smaller distance, or higher version when distance is equal
+        if dist < min_diff or (dist == min_diff and sel_elt and elt.version > sel_elt.version) then
           min_diff = dist
           sel_elt = elt
         end