Update local changes

requirements.txt

@@ -12,4 +12,5 @@ google-generativeai
 langchain-google-genai
 pdfkit
 gradio
-pypdf
+pypdf
+langchain-chroma

seminar_edition_ai.py

@@ -4,6 +4,8 @@ from langchain.chains.question_answering import load_qa_chain
 import chromadb
 from datetime import datetime
 import os
+from langchain_chroma import Chroma
+
 from datetime import datetime
 import pdfkit
 from langchain.chains.question_answering import load_qa_chain