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import shutil
from haystack.document_stores import FAISSDocumentStore
from haystack.nodes import EmbeddingRetriever
from haystack.pipelines import ExtractiveQAPipeline
from haystack.nodes import FARMReader
import streamlit as st
from config import (INDEX_DIR, RETRIEVER_MODEL, RETRIEVER_MODEL_FORMAT,
READER_MODEL, READER_CONFIG_THRESHOLD, QUESTIONS_PATH)
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=RETRIEVER_MODEL,
model_format=RETRIEVER_MODEL_FORMAT
)
reader = FARMReader(model_name_or_path=READER_MODEL,
use_gpu=False,
confidence_threshold=READER_CONFIG_THRESHOLD)
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 load_questions():
with open(QUESTIONS_PATH) as fin:
questions = [line.strip() for line in fin.readlines()
if not line.startswith('#')]
return questions |