Fix load_crash_data retriever function

retriever.py

@@ -1,6 +1,7 @@
 from smolagents import Tool
 from langchain_community.retrievers import BM25Retriever
 from langchain.docstore.document import Document
+from tools import CrashInfoRetrieverTool  # Import the CrashInfoRetrieverTool
 import datasets
 import pandas as pd
 import requests
@@ -50,7 +51,6 @@ def load_guest_dataset():
     # Return the tool
     return GuestInfoRetrieverTool(docs)
 
-
 def load_crash_data():
     # Public Philly crash data CSV (small demo file)
     url = "https://phl.carto.com/api/v2/sql?q=SELECT+*+FROM+vision_zero_crash+LIMIT+5000&format=csv"
@@ -72,6 +72,7 @@ def load_crash_data():
             f"Weather: {row.get('weather', 'N/A')}"
         ])
         docs.append(Document(page_content=content, metadata={"id": row.get("id", "unknown")}))
-    
-    return docs
+
+    # Return an instance of CrashInfoRetrieverTool
+    return CrashInfoRetrieverTool(docs)