fix(llama.cpp): disable mirostat as default

Even if increasing the quality of the output, it has shown to have
performance drawbacks to be so noticeable that the confuses users about
speed of LocalAI. This changeset disables Mirostat by default (which can
be still enabled manually).

Signed-off-by: Ettore Di Giacinto <[email protected]>

Author: mudler

core/config/backend_config.go

@@ -261,7 +261,8 @@ func (cfg *BackendConfig) SetDefaults(opts ...ConfigLoaderOption) {
 	defaultTopP := 0.95
 	defaultTopK := 40
 	defaultTemp := 0.9
-	defaultMirostat := 2
+	// https://github.com/mudler/LocalAI/issues/2780
+	defaultMirostat := 0
 	defaultMirostatTAU := 5.0
 	defaultMirostatETA := 0.1
 	defaultTypicalP := 1.0