Fix lazy import location (#795)

python/sglang/__init__.py

-import importlib
-
-
-class LazyImport:
-    def __init__(self, module_name, class_name):
-        self.module_name = module_name
-        self.class_name = class_name
-        self._module = None
-
-    def _load(self):
-        if self._module is None:
-            module = importlib.import_module(self.module_name)
-            self._module = getattr(module, self.class_name)
-        return self._module
-
-    def __getattr__(self, name):
-        module = self._load()
-        return getattr(module, name)
-
-    def __call__(self, *args, **kwargs):
-        module = self._load()
-        return module(*args, **kwargs)
-
-
 # SGL API Components
 from sglang.api import (
     Runtime,
@@ -49,13 +25,14 @@ from sglang.global_config import global_config
 
 # SGL Backends
 from sglang.lang.backend.runtime_endpoint import RuntimeEndpoint
+from sglang.utils import LazyImport
+from sglang.version import __version__
 
 Anthropic = LazyImport("sglang.lang.backend.anthropic", "Anthropic")
 LiteLLM = LazyImport("sglang.lang.backend.litellm", "LiteLLM")
 OpenAI = LazyImport("sglang.lang.backend.openai", "OpenAI")
 VertexAI = LazyImport("sglang.lang.backend.vertexai", "VertexAI")
 
-from .version import __version__
 
 # public APIs management
 __all__ = [

python/sglang/utils.py

 """Common utilities."""
 
 import base64
+import importlib
 import json
 import logging
 import signal
@@ -261,3 +262,24 @@ def graceful_registry(sub_module_name):
             logger.info(f"{sub_module_name} recive sigterm")
 
     signal.signal(signal.SIGTERM, graceful_shutdown)
+
+
+class LazyImport:
+    def __init__(self, module_name, class_name):
+        self.module_name = module_name
+        self.class_name = class_name
+        self._module = None
+
+    def _load(self):
+        if self._module is None:
+            module = importlib.import_module(self.module_name)
+            self._module = getattr(module, self.class_name)
+        return self._module
+
+    def __getattr__(self, name):
+        module = self._load()
+        return getattr(module, name)
+
+    def __call__(self, *args, **kwargs):
+        module = self._load()
+        return module(*args, **kwargs)