Update app.py

app.py

@@ -2,7 +2,7 @@ from langchain_openai import OpenAIEmbeddings
 from langchain_community.vectorstores import Chroma
 from langchain_core.messages import HumanMessage, AIMessage
 from langchain_text_splitters import RecursiveCharacterTextSplitter
-from langgraph import StateGraph, END, START
+from langgraph.graph import StateGraph, END, START
 from langgraph.prebuilt import ToolNode
 from langgraph.graph.message import add_messages
 from typing_extensions import TypedDict, Annotated
@@ -309,7 +309,7 @@ def main():
     st.markdown("---")
 
     query = st.text_area("Enter your question:", height=100, 
-                       placeholder="e.g., What is the latest advancement in AI research?")
+                         placeholder="e.g., What is the latest advancement in AI research?")
 
     col1, col2 = st.columns([1, 2])
     with col1:
@@ -346,4 +346,4 @@ def main():
         """)
 
 if __name__ == "__main__":
-    main()
+    main()