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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)
@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=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
@st.cache()
def load_questions():
with open(QUESTIONS_PATH) as fin:
questions = [line.strip() for line in fin.readlines()
if not line.startswith('#')]
return questions
# # the following function is a wrapper for start_haystack,
# # which loads document store, retriever, reader and creates pipeline.
# # cached to make index and models load only at start
# @st.cache(hash_funcs={"builtins.SwigPyObject": lambda _: None},
# allow_output_mutation=True)
# def start_app():
# return start_haystack()
# @st.cache()
# def load_questions_wrapper():
# return load_questions()
pipe = start_haystack()
# the pipeline is not included as parameter of the following function,
# because it is difficult to cache
@st.cache(persist=True, allow_output_mutation=True)
def query(question: str, retriever_top_k: int = 10, reader_top_k: int = 5):
"""Run query and get answers"""
params = {"Retriever": {"top_k": retriever_top_k},
"Reader": {"top_k": reader_top_k}}
results = pipe.run(question, params=params)
return results |