[Feature] Initial support for multi-LoRA serving (#1307)

python/sglang/srt/lora/lora_config.py

@@ -0,0 +1,43 @@
+"""
+Copyright 2023-2024 SGLang 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.
+"""
+
+import json
+import os
+
+from huggingface_hub import snapshot_download
+
+
+class LoRAConfig:
+    def __init__(
+        self,
+        path: str,
+    ) -> None:
+        self.path = path
+        self.hf_config = self.get_lora_config()
+        self.target_modules = self.hf_config["target_modules"]
+        self.r = self.hf_config["r"]
+        self.lora_alpha = self.hf_config["lora_alpha"]
+
+    def get_lora_config(self, dummy=False):
+        if dummy:
+            raise NotImplementedError()
+        else:
+            if not os.path.isdir(self.path):
+                weights_dir = snapshot_download(self.path, allow_patterns=["*.json"])
+            else:
+                weights_dir = self.path
+            config_name = "adapter_config.json"
+            with open(os.path.join(weights_dir, config_name), "r") as f:
+                return json.load(f)