Update app.py

app.py

@@ -27,6 +27,8 @@ RERANK_MODEL_NAME = "BAAI/bge-reranker-large"      # cross-encoder reranker
 COLLECTION_NAME = "pdf_rag_en"
 
 DEFAULT_MODELS = [
+    "Qwen/Qwen2.5-1.5B-Instruct",  # CPU-friendly
+    "microsoft/Phi-3.1-mini-4k-instruct",  # CPU-friendly
     "Qwen/Qwen2.5-7B-Instruct",
     "meta-llama/Meta-Llama-3.1-8B-Instruct",
     "mistralai/Mistral-7B-Instruct-v0.3",