PDFReader = download_loader("PDFReader")
loader = PDFReader()
document1 = loader.load_data(file=Path('./file1.pdf'))
document2 = loader.load_data(file=Path('./file2.pdf'))
graph_builder = QASummaryGraphBuilder(service_context=service_context_gpt4)
graph = graph_builder.build_graph_from_documents(documents=[document1, document2])'list' object has no attribute 'get_text'