Update ppt_parser.py

ppt_parser.py

@@ -17,11 +17,6 @@
 #         - Content : Extracting slide with unique title and add the title as a metadata for a slide. 
 #                     Assuming slide with unique title are the start of a new subject for the following slide 
 
-from io import BytesIO
-from pptx import Presentation
-from collections import defaultdict
-
-
 class RAGFlowPptParser(object):
     def __init__(self):
         super().__init__()