First attempt

app.py

@@ -0,0 +1,32 @@
+import streamlit as st
+from haystack.document_stores import InMemoryDocumentStore
+from haystack.nodes import FARMReader, PreProcessor, PDFToTextConverter, TfidfRetriever
+import logging
+
+document_store = InMemoryDocumentStore()
+preprocessor = PreProcessor(
+    clean_empty_lines=True,
+    clean_whitespace=True,
+    clean_header_footer=True,
+    split_by="word",
+    split_length=100,
+    split_respect_sentence_boundary=True,
+    split_overlap=3
+)
+
+uploaded_files = st.file_uploader(label='Upload a PDF Document', accept_multiple_files=True)
+logging.info(uploaded_files)
+
+def pdf_to_document_store(pdf_files):
+    document_store.delete_documents()
+    converter = PDFToTextConverter(remove_numeric_tables=True, valid_languages=["en"])
+    documents = []
+    for pdf in pdf_files:
+        documents.append(converter.convert(file_path=pdf.name, meta=None))
+    preprocessed_docs = preprocessor.process(documents)
+    document_store.write_documents(preprocessed_docs)
+    return None
+
+if uploaded_files is not None:
+    document_store.delete_all_documents()
+    pdf_to_document_store(uploaded_files)

requirements.txt

@@ -0,0 +1 @@
+farm-haystack==1.4.0