update build script

Azaion.Inference/build.cmd

@@ -5,13 +5,12 @@ cd %~dp0
 echo remove dist folder:
 if exist dist rmdir dist /s /q
 if exist build rmdir build /s /q
-if exist venv rmdir venv /s /q
 
 echo install python and dependencies
 python -m venv venv
 
 venv\Scripts\python -m pip install --upgrade pip
-venv\Scripts\pip install --no-cache-dir -r requirements.txt
+venv\Scripts\pip install -r requirements.txt
 venv\Scripts\pip install --upgrade pyinstaller pyinstaller-hooks-contrib
 
 venv\Scripts\python setup.py build_ext --inplace