Update main.py

main.py

@@ -7,6 +7,13 @@ from langchain.text_splitter import RecursiveCharacterTextSplitter
 from PyPDF2 import PdfReader
 from fastapi import Depends
 
+import random
+import string
+import sys
+import timeit
+import datetime
+import io
+
 def generate_random_string(length):
     letters = string.ascii_lowercase
     return ''.join(random.choice(letters) for i in range(length))