haystack/ui/webapp.py

import streamlit as st
from annotated_text import annotated_text

from utils import haystack_query


def annotate_answer(answer, context):
    start_idx = context.find(answer)
    end_idx = start_idx + len(answer)
    annotated_text(context[:start_idx], (answer, "ANSWER", "#8ef"), context[end_idx:])


st.write("# Haystack Demo")
st.sidebar.header("Options")
top_k_reader = st.sidebar.slider("Max. number of answers", min_value=1, max_value=10, value=3, step=1)
top_k_retriever = st.sidebar.slider(
    "Max. number of documents from retriever", min_value=1, max_value=10, value=3, step=1
)
question = st.text_input("Please provide your query:", value="Who is the father of Arya Starck?")
run_query = st.button("Run")
debug = st.sidebar.checkbox("Show debug info")
if run_query:
    with st.spinner(
        "Performing neural search on documents... 🧠 \n "
        "Do you want to optimize speed or accuracy? \n"
        "Check out the docs: https://haystack.deepset.ai/docs/latest/optimizationmd "
    ):
        results, raw_json = haystack_query(question, top_k_reader=top_k_reader, top_k_retriever=top_k_retriever)
    st.write("## Retrieved answers:")
    for result in results:
        annotate_answer(result["answer"], result["context"])
        "**Relevance:** ", result["relevance"], "**Source:** ", result["source"]
    if debug:
        st.subheader("REST API JSON response")
        st.write(raw_json)