Update retrievers.py

retrievers.py

@@ -23,7 +23,7 @@ class PARetriever(BaseRetriever):
         mode: str = "OR",
         rewriter: bool = True,
         classifier_model: Optional[str] = None,  # Optional classifier model
-        device: str = 'mps',  # Set to 'mps' as the default device
+        device: str = 'cpu',  # Device to CPU for huggingface demo
         reranker_model_name: Optional[str] = None,  # Model name for SentenceTransformerRerank
         verbose: bool = False,  # Verbose flag
         fixed_params: Optional[dict] = None,  # New parameter to pass in fixed parameters