minor change

reranker.py

@@ -7,7 +7,7 @@ class Reranker:
         self.tokenizer = AutoTokenizer.from_pretrained("Qwen/Qwen3-Reranker-4B", padding_side='left')
         self.model = AutoModelForCausalLM.from_pretrained("Qwen/Qwen3-Reranker-4B").eval()
 
-    def format_instruction(instruction, query, doc):
+    def format_instruction(self,instruction, query, doc):
         if instruction is None:
             instruction = 'Given a web search query, retrieve relevant passages that answer the query'
         output = "<Instruct>: {instruction}\n<Query>: {query}\n<Document>: {doc}".format(instruction=instruction,query=query, doc=doc)