Fix opset version of the optimizer in function generate_artifacts

orttraining/orttraining/python/training/artifacts.py

@@ -53,6 +53,8 @@ def generate_artifacts(
         3. Checkpoint (directory): Contains the model parameters.
         4. Optimizer model (onnx.ModelProto): Model containing the optimizer graph.
 
+    All generated ModelProto are using the same opsets defined by *model*.
+
     Args:
         model: The base model to be used for gradient graph generation.
         requires_grad: List of names of model parameters that require gradient computation
@@ -207,11 +209,17 @@ def _export_to_ort_format(model_path, output_dir, extra_options):
 
     logging.info("Optimizer enum provided: %s", optimizer.name)
 
+    opset_version = None
+    for domain in model.opset_import:
+        if domain.domain == "":
+            opset_version = domain.version
+            break
+
     optim_model = None
     optim_blocks = {OptimType.AdamW: onnxblock.optim.AdamW, OptimType.SGD: onnxblock.optim.SGD}
 
     optim_block = optim_blocks[optimizer]()
-    with onnxblock.empty_base():
+    with onnxblock.empty_base(opset_version=opset_version):
         _ = optim_block(model_params)
         optim_model = optim_block.to_model_proto()