Update app.py

app.py

@@ -1,5 +1,15 @@
 import gradio as gr
 
+import subprocess
+import sys
+
+def install(package):
+    subprocess.check_call([sys.executable, "-m", "pip", "install", package])
+
+install("langchain_community")
+install("langchain_openai")
+install("langchain")
+
 import  os
 from langchain_community.graphs import Neo4jGraph
 from langchain.chains import GraphCypherQAChain