1.Change the name of is_fastapi_available function

2. Added the log of printing requests when deploying using vllm

src/llmtuner/extras/packages.py

@@ -20,7 +20,7 @@ def _get_package_version(name: str) -> "Version":
         return version.parse("0.0.0")
 
 
-def is_fastapi_availble():
+def is_fastapi_available():
     return _is_package_available("fastapi")