Update handler.py

handler.py

@@ -5,8 +5,18 @@ import subprocess
 
 
 # Manually install bitsandbytes
-subprocess.check_call([os.sys.executable, "-m", "pip", "install", "bitsandbytes==0.39.1"])
-subprocess.check_call([os.sys.executable, "-m", "pip", "install", "accelerate==0.20.0"])
+def install(package):
+    subprocess.check_call([sys.executable, "-m", "pip", "install", package])
+
+try:
+    import bitsandbytes
+except ImportError:
+    install("bitsandbytes==0.39.1")
+
+try:
+    import accelerate
+except ImportError:
+    install("accelerate==0.20.0")
 
 class ModelHandler:
     def __init__(self):