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import time
import streamlit as st
import logging
import pandas as pd
from json import JSONDecodeError
from markdown import markdown
import random
from typing import List, Dict, Any, Tuple, Optional
from haystack.document_stores import FAISSDocumentStore
from haystack.nodes import EmbeddingRetriever
from haystack.pipelines import ExtractiveQAPipeline
from haystack.nodes import FARMReader
from haystack.pipelines import ExtractiveQAPipeline
from annotated_text import annotation
import shutil
# FAISS index directory
INDEX_DIR = 'data/index'
# the following function is cached to make index and models load only at start
@st.cache(hash_funcs={"builtins.SwigPyObject": lambda _: None}, allow_output_mutation=True)
def start_haystack():
"""
load document store, retriever, reader and create pipeline
"""
shutil.copy(f'{INDEX_DIR}/faiss_document_store.db','.')
document_store = FAISSDocumentStore(
faiss_index_path=f'{INDEX_DIR}/my_faiss_index.faiss',
faiss_config_path=f'{INDEX_DIR}/my_faiss_index.json')
print (f'Index size: {document_store.get_document_count()}')
retriever = EmbeddingRetriever(
document_store=document_store,
embedding_model="sentence-transformers/multi-qa-mpnet-base-dot-v1",
model_format="sentence_transformers"
)
reader = FARMReader(model_name_or_path="deepset/roberta-base-squad2", use_gpu=True)
pipe = ExtractiveQAPipeline(reader, retriever)
return pipe
def set_state_if_absent(key, value):
if key not in st.session_state:
st.session_state[key] = value
def query(pipe, question):
"""Run query and get answers"""
return (pipe.run(question, params={"Retriever": {"top_k": 10}, "Reader": {"top_k": 5}}), None)
def get_backlink(result) -> Tuple[Optional[str], Optional[str]]:
if result.get("document", None):
doc = result["document"]
if isinstance(doc, dict):
if doc.get("meta", None):
if isinstance(doc["meta"], dict):
if doc["meta"].get("url", None) and doc["meta"].get("name", None):
return doc["meta"]["url"], doc["meta"]["name"]
return None, None
def main():
# st.set_page_config(page_title='Who killed Laura Palmer?',
# page_icon="https://static.wikia.nocookie.net/twinpeaks/images/4/4a/Site-favicon.ico/revision/latest?cb=20210710003705")
pipe=start_haystack()
# Persistent state
set_state_if_absent('question', "Where is Twin Peaks?")
set_state_if_absent('answer', '')
set_state_if_absent('results', None)
set_state_if_absent('raw_json', None)
set_state_if_absent('random_question_requested', False)
# Small callback to reset the interface in case the text of the question changes
def reset_results(*args):
st.session_state.answer = None
st.session_state.results = None
st.session_state.raw_json = None
# sidebar style
st.markdown(
"""
<style>
[data-testid="stSidebar"][aria-expanded="true"] > div:first-child{
width: 350px;
}
[data-testid="stSidebar"][aria-expanded="false"] > div:first-child{
width: 350px;
margin-left: -350px;
}
""",
unsafe_allow_html=True,
)
# Title
st.write("# Who killed Laura Palmer?")
st.write("### The first Twin Peaks Question Answering system!")
st.markdown("""
Ask any question about Twin Peaks [Twin Peaks] (https://twinpeaks.fandom.com/wiki/Twin_Peaks)
and see if the AI ββcan find an answer...
*Note: do not use keywords, but full-fledged questions.*
""")
# Sidebar
st.sidebar.header("Who killed Laura Palmer?")
st.sidebar.image("https://upload.wikimedia.org/wikipedia/it/3/39/Twin-peaks-1990.jpg")
st.sidebar.markdown('<p align="center"><b>Twin Peaks Question Answering system</b></p>', unsafe_allow_html=True)
st.sidebar.markdown(f"""
<style>
a {{
text-decoration: none;
}}
.haystack-footer {{
text-align: center;
}}
.haystack-footer h4 {{
margin: 0.1rem;
padding:0;
}}
footer {{
opacity: 0;
}}
.haystack-footer img {{
display: block;
margin-left: auto;
margin-right: auto;
width: 85%;
}}
</style>
<div class="haystack-footer">
<p><a href="https://github.com/anakin87/who-killed-laura-palmer">GitHub</a> -
Built with <a href="https://github.com/deepset-ai/haystack/">Haystack</a><br/>
<small>Data crawled from <a href="https://twinpeaks.fandom.com/wiki/Twin_Peaks_Wiki">Twin Peaks Wiki</a>.</small>
</p>
<img src = 'https://static.wikia.nocookie.net/twinpeaks/images/e/ef/Laura_Palmer%2C_the_Queen_Of_Hearts.jpg'/>
<br/>
</div>
""", unsafe_allow_html=True)
# spotify webplayer
st.sidebar.markdown("""
<p align="center">
<iframe style="border-radius:12px" src="https://open.spotify.com/embed/playlist/38rrtWgflrw7grB37aMlsO?utm_source=generator" width="85%" height="380" frameBorder="0" allowfullscreen="" allow="autoplay; clipboard-write; encrypted-media; fullscreen; picture-in-picture"></iframe>
</p>""", unsafe_allow_html=True)
# Search bar
question = st.text_input("",
value=st.session_state.question,
max_chars=100,
#on_change=reset_results
)
col1, col2 = st.columns(2)
col1.markdown("<style>.stButton button {width:100%;}</style>", unsafe_allow_html=True)
col2.markdown("<style>.stButton button {width:100%;}</style>", unsafe_allow_html=True)
# Run button
run_pressed = col1.button("Run")
df=''
# Get next random question from the CSV
if col2.button("Random question"):
reset_results()
new_row = df.sample(1)
while new_row["Question Text"].values[0] == st.session_state.question: # Avoid picking the same question twice (the change is not visible on the UI)
new_row = df.sample(1)
st.session_state.question = new_row["Question Text"].values[0]
st.session_state.answer = new_row["Answer"].values[0]
st.session_state.random_question_requested = True
# Re-runs the script setting the random question as the textbox value
# Unfortunately necessary as the Random Question button is _below_ the textbox
raise st.script_runner.RerunException(st.script_request_queue.RerunData(None))
else:
st.session_state.random_question_requested = False
run_query = (run_pressed or question != st.session_state.question) and not st.session_state.random_question_requested
# Get results for query
if run_query and question:
time_start=time.time()
reset_results()
st.session_state.question = question
with st.spinner(
"π§ Performing neural search on documents..."
):
try:
st.session_state.results, st.session_state.raw_json = query(pipe, question)
time_end=time.time()
print(f'elapsed time: {time_end - time_start}')
except JSONDecodeError as je:
st.error("π An error occurred reading the results. Is the document store working?")
return
except Exception as e:
logging.exception(e)
if "The server is busy processing requests" in str(e) or "503" in str(e):
st.error("π§βπΎ All our workers are busy! Try again later.")
else:
st.error("π An error occurred during the request.")
return
if st.session_state.results:
st.write("## Results:")
alert_irrelevance=True
for count, result in enumerate(st.session_state.results['answers']):
result=result.to_dict()
if result["answer"]:
if alert_irrelevance and result['score']<=0.40:
alert_irrelevance = False
st.write("<h3 style='color: red'>Attention, the following answers have low relevance:</h3>", unsafe_allow_html=True)
answer, context = result["answer"], result["context"]
#authors, title = result["meta"]["authors"], result["meta"]["title"]
start_idx = context.find(answer)
end_idx = start_idx + len(answer)
#url = get_backlink(result, my_ip)
# Hack due to this bug: https://github.com/streamlit/streamlit/issues/3190
st.write(markdown("- ..."+context[:start_idx] + str(annotation(answer, "ANSWER", "#3e1c21")) + context[end_idx:]+"..."), unsafe_allow_html=True)
source = ""
url, title = get_backlink(result)
if url and title:
source = f"[{result['document']['meta']['title']}]({result['document']['meta']['url']})"
else:
source = f"{result['source']}"
st.markdown(f"**Score:** {result['relevance']} - **Source:** {source}")
else:
st.info("π€ Haystack is unsure whether any of the documents contain an answer to your question. Try to reformulate it!")
main()
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