Update app.py

app.py

@@ -29,7 +29,7 @@ if os.environ["HUGGINGFACEHUB_API_TOKEN"] == "default-token":
 # Model and embedding options
 LLM_MODELS = {
     "Balanced (Mixtral-8x7B)": "mistralai/Mixtral-8x7B-Instruct-v0.1",
-    "Lightweight (Gemma-2B)": "google/gemma-2b-it",
+    "Lightweight (Gemma-2B)": "google/gemma-2-2b-it",
     "High Accuracy (Llama-3-8B)": "meta-llama/Llama-3-8b-hf"
 }