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"}),