Update app.py

app.py

@@ -24,6 +24,7 @@ model = get_mobilenet(width_mult=NAME_TO_WIDTH(MODEL_NAME), pretrained_name=MODE
 model.to(device)
 model.eval()    
 
+chatgpt_chain = None
 cached_audio_class = "c" 
 template = None
 prompt = None
@@ -70,6 +71,7 @@ def format_classname(classname):
 def formatted_message(audio_class, human_input):
     global cached_audio_class 
     global session_token
+    global chatgpt_chain
     formatted_classname = format_classname(audio_class)
     if cached_audio_class != formatted_classname: