added refiner in upload pdf

src/pipeline.py

@@ -115,6 +115,8 @@ class ChatPipeline:
         if not pdf_path:
             raise ValueError("pdf_path must be provided to setup the pipeline.")
 
+        self.query_refiner = QueryRefiner()
+
         documents = extract_text_from_pdf(pdf_path)
 
         preprocessed_docs = self._preprocess_docs(documents)