[v1] add accelerator (#9607)

src/llamafactory/v1/plugins/model_plugins/peft.py

@@ -0,0 +1,42 @@
+# 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 typing import Literal, TypedDict
+
+from peft import LoraConfig, PeftModel, get_peft_model
+
+from ...utils.plugin import BasePlugin
+from ...utils.types import HFModel
+
+
+class LoraConfigDict(TypedDict, total=False):
+    name: Literal["lora"]
+    """Plugin name."""
+    r: int
+    """Lora rank."""
+    lora_alpha: int
+    """Lora alpha."""
+    target_modules: list[str]
+    """Target modules."""
+
+
+class PeftPlugin(BasePlugin):
+    pass
+
+
+@PeftPlugin("lora").register
+def get_lora_model(model: HFModel, config: LoraConfigDict) -> PeftModel:
+    peft_config = LoraConfig(**config)
+    model = get_peft_model(model, peft_config)
+    return model