[fix] gradio port

chatbot_graph.py

@@ -16,7 +16,7 @@ from answer_search import *
 class ChatBotGraph:
     def __init__(self):
         self.g = Graph(
-            'http://127.0.0.1:7474',
+            'http://127.0.0.1:7476',
             user="neo4j",
             password="neo4j")
         self.classifier = QuestionClassifier(self.g)