Update app.py

app.py

@@ -24,8 +24,9 @@ from huggingface_hub import login
 FAISS_INDEX_PATH = "faiss_index"
 BM25_INDEX_PATH = "bm25_index.pkl"
 CACHE_VERSION = "v1"  # Increment when data format changes
+
 embedding_model_name = "sentence-transformers/all-MiniLM-L6-v2"
-generation_model_name = "mistralai/Mistral-7B-Instruct-v0.1"
+generation_model_name = "microsoft/phi-2"
 data_file_name = "AskNatureNet_data_enhanced.json"
 CHUNK_SIZE = 800
 OVERLAP = 200