Update app.py

app.py

@@ -57,6 +57,14 @@ def chat(message,
     }
 
     print("MODEL" + model)
+
+    if model == "zephyr_7b":
+        model = zephyr_7b
+    elif model == "llama_7b"
+        model = llama_7b
+    elif model == "llama_13b":
+        model == llama_13b
+
     response = requests.post(model, headers=headers, data=json.dumps(data), auth=("hf", hf_token), stream=True)