trying a new summarizer model

app.py

@@ -17,7 +17,7 @@ def start_haystack():
         split_length=200,
         split_respect_sentence_boundary=True,
     )
-    summarizer = TransformersSummarizer(model_name_or_path="google/pegasus-newsroom")
+    summarizer = TransformersSummarizer(model_name_or_path="facebook/bart-large-cnn")
     return document_store, summarizer, preprocessor
 
 
@@ -44,7 +44,6 @@ document_store, summarizer, preprocessor = start_haystack()
 uploaded_files = st.file_uploader("Choose PDF files", accept_multiple_files=True)
 
 if uploaded_files is not None:
-    st.write(len(uploaded_files))
     if st.button('Summarize Documents'):
         summarize(uploaded_files)
 
@@ -52,4 +51,4 @@ if st.button('Calculate num of docs'):
     st.write(document_store.get_document_count())
 
 if st.button('Clear DocumentStore'):
-    document_store.delete_all_documents()
+    document_store.delete_documents()