Update app.py

app.py

@@ -4,15 +4,13 @@ from transformers import AutoModelForCausalLM, AutoTokenizer, AutoModel
 from huggingface_hub import login
 import torch
 
-login(token=os.getenv('HF_TOKEN'))
-
 class VietnameseChatbot:
-    def __init__(self, model_name="meta-llama/Llama-2-7b-chat-hf"):
+    def __init__(self, model_name="tamgrnguyen/Gemma-2-2b-it-Vietnamese-Aesthetic"):
         """
         Initialize the Vietnamese chatbot with a pre-trained model
         """
         self.tokenizer = AutoTokenizer.from_pretrained(model_name)
-        self.model = AutoModel.from_pretrained(model_name)
+        self.model = AutoModelForCausalLM.from_pretrained(model_name)
         
         # Use GPU if available
         self.device = "cuda" if torch.cuda.is_available() else "cpu"