Update app.py

app.py

@@ -3,6 +3,7 @@ import os
 from langchain.chains import RetrievalQA
 from langchain.llms import OpenAI
 from langchain.document_loaders import PyPDFLoader
+from langchain.document_loaders import DirectoryLoader
 from langchain.text_splitter import CharacterTextSplitter
 from langchain.embeddings import OpenAIEmbeddings
 from langchain.vectorstores import Chroma
@@ -21,7 +22,8 @@ def qa_system(pdf_file, openai_key, prompt, chain_type, k):
     os.environ["OPENAI_API_KEY"] = openai_key
     
     # load document
-    loader = PyPDFLoader(pdf_file.name)
+    # loader = PyPDFLoader(pdf_file.name)
+    loader = DirectoryLoader(dir_path, glob="**/*.pdf", loader_cls=PDFLoader)
     documents = loader.load()
     
     # split the documents into chunks