feat: qwen3 export to HF (#873)

Signed-off-by: Abdalgader Abubaker <136640907+abdalgader-a@users.noreply.github.com>
Signed-off-by: Anna Shors <ashors@nvidia.com>
Co-authored-by: Abdalgader Abubaker <136640907+abdalgader-a@users.noreply.github.com>

Author: ashors1

.gitmodules

@@ -1,7 +1,7 @@
 [submodule "3rdparty/NeMo"]
 	path = 3rdparty/NeMo-workspace/NeMo
 	url = https://github.com/NVIDIA/NeMo.git
-	branch = zhiyul/yukih/prepare-refit-info
+	branch = https://github.com/NVIDIA/NeMo/tree/ashors/rl-qwen3-export
 	shallow = true
 [submodule "3rdparty/Megatron-LM"]
 	path = 3rdparty/Megatron-LM-workspace/Megatron-LM

3rdparty/NeMo-workspace/NeMo

@@ -85,9 +85,14 @@ def export_model_from_megatron(
         from nemo.tron.converter.qwen import HFQwen2Exporter
 
         exporter_cls = HFQwen2Exporter
+
+    elif hf_config.model_type in ("qwen3", "qwen3_moe"):
+        from nemo.tron.converter.qwen import HFQwen3Exporter
+
+        exporter_cls = HFQwen3Exporter
     else:
         raise ValueError(
-            f"Unknown model: {hf_model_name}. Currently, only Qwen2 and Llama are supported. "
+            f"Unknown model: {hf_model_name}. Currently, only Qwen2, Qwen3 and Llama are supported. "
             "If you'd like to run with a different model, please raise an issue or consider adding your own converter."
         )
     print(f"Exporting model {hf_model_name} to {output_path}...")