@java.lang.Override
      public final boolean isInitialized() {
        byte isInitialized = memoizedIsInitialized;
        if (isInitialized == 1) return true;
        if (isInitialized == 0) return false;

        memoizedIsInitialized = 1;
        return true;
      }
<pre>
The model routing preference.
</pre>

<code>
optional .google.cloud.vertexai.v1.GenerationConfig.RoutingConfig.AutoRoutingMode.ModelRoutingPreference model_routing_preference = 1;
</code>

@return The modelRoutingPreference.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerationConfig.java