support qwen3 name_mapping (#3180)

fastdeploy/rl/rollout_model.py

@@ -429,4 +429,24 @@ class Qwen3ForCausalLMRL(Qwen3ForCausalLM, BaseRLModel):
         return "Qwen3ForCausalLMRL"
 
     def get_name_mappings_to_training(self, trainer_degree=None) -> Dict[str, str]:
-        pass
+        # Prepare placeholders
+        place_holders = ["weight"]
+
+        # Initialize mapping dictionary
+        self._update_base_mappings("model")
+        base_name = "model.layers"
+
+        # Helper function to add layer mappings
+        def _add_layer_mappings(layer_idx):
+            # FFN mappings
+            for ph in place_holders:
+                self.infer_to_train_mapping[f"{base_name}.{layer_idx}.mlp.up_gate_proj.{ph}"] = (
+                    f"{base_name}.{layer_idx}.mlp.gate_up_fused_proj.{ph}"
+                )
+
+        for layer_idx in range(self.fd_config.model_config.num_hidden_layers):
+            _add_layer_mappings(layer_idx)
+
+        self._complete_missing_mappings()
+
+        return self.infer_to_train_mapping