[v1] add v1 launcher (#9236)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

src/llamafactory/v1/trainers/sft_trainer.py

@@ -0,0 +1,34 @@
+# Copyright 2025 the LlamaFactory team.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+from ..config.parser import get_args
+from ..core.base_trainer import BaseTrainer
+from ..core.data_engine import DataEngine
+from ..core.model_engine import ModelEngine
+
+
+class SFTTrainer(BaseTrainer):
+    pass
+
+
+def run_sft():
+    model_args, data_args, training_args, _ = get_args()
+    model_engine = ModelEngine(model_args)
+    data_engine = DataEngine(data_args)
+    model = model_engine.get_model()
+    processor = model_engine.get_processor()
+    data_loader = data_engine.get_data_loader(processor)
+    trainer = SFTTrainer(training_args, model, processor, data_loader)
+    trainer.fit()