Update app.py

app.py

@@ -6,7 +6,7 @@ from haystack.utils import convert_files_to_docs
 from haystack.schema import Answer
 from haystack.document_stores import InMemoryDocumentStore
 from haystack.pipelines import ExtractiveQAPipeline
-from haystack.nodes import FARMReader, BM25Retriever
+from haystack.nodes import FARMReader, TfidfRetriever
 import logging
 from markdown import markdown
 from annotated_text import annotation
@@ -25,7 +25,7 @@ DEFAULT_ANSWER_AT_STARTUP = os.getenv("DEFAULT_ANSWER_AT_STARTUP", "Paris")
 def place_header_center(text, lottie_data):
     cgap1, ctitle, cgap2 = st.columns([3, 3, 1])
     with cgap1:
-        st_lottie(lottie_data, height=150)
+        st_lottie(lottie_data, height=250)
     with ctitle:
         st.title(text)
     with cgap2:
@@ -52,7 +52,7 @@ def load_and_write_data(document_store):
 # def start_haystack():
 document_store = InMemoryDocumentStore() # use_bm25=True
 load_and_write_data(document_store)
-retriever = BM25Retriever(document_store=document_store)
+retriever = TfidfRetriever(document_store=document_store)
 reader = FARMReader(model_name_or_path="mrm8488/RuPERTa-base-finetuned-squadv1",
                     use_gpu=False,
                     num_processes=1)