Update app.py

app.py

@@ -6,8 +6,7 @@ from langchain.document_loaders import (
  CSVLoader,
  EverNoteLoader,
  PDFMinerLoader,
- UnstructuredPDFLoader,
- MathpixPDFLoader,
+ PyPDFium2Loader,
  TextLoader,
  UnstructuredEmailLoader,
  UnstructuredEPubLoader,
@@ -47,8 +46,7 @@ LOADER_MAPPING = {
  ".md": (UnstructuredMarkdownLoader, {}),
  ".odt": (UnstructuredODTLoader, {}),
  #".pdf": (PDFMinerLoader, {}),
- #".pdf": (UnstructuredPDFLoader, {}),
- ".pdf": (MathpixPDFLoader, {}),
+ ".pdf": (PyPDFium2Loader, {}),
  ".ppt": (UnstructuredPowerPointLoader, {}),
  ".pptx": (UnstructuredPowerPointLoader, {}),
  ".txt": (TextLoader, {"encoding": "utf8"}),