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from abc import ABC, abstractmethod
from haystack.nodes import BM25Retriever, FARMReader
from haystack.document_stores import ElasticsearchDocumentStore
from haystack.pipelines import ExtractiveQAPipeline
import certifi
ca_certs=certifi.where()
class DocumentQueries(ABC):
@abstractmethod
def search_by_query(self, query : str, retriever_top_k: int, reader_top_k: int, es_index: str):
pass
class ExtractiveProposalQueries(DocumentQueries):
def __init__(self, es_host: str, es_index: str, es_user, es_password, reader_name_or_path: str, use_gpu = True) -> None:
reader = FARMReader(model_name_or_path = reader_name_or_path, use_gpu = use_gpu, num_processes=1)
self._initialize_pipeline(es_host, es_index, es_user, es_password, reader = reader)
def _initialize_pipeline(self, es_host, es_index, es_user, es_password, reader = None):
if reader is not None:
self.reader = reader
self.es_host = es_host
self.es_user = es_user
self.es_password = es_password
self.document_store = ElasticsearchDocumentStore(host = es_host, username=es_user, password=es_password, index = es_index, port = 443, scheme='https', verify_certs=True, ca_certs=ca_certs)
self.retriever = BM25Retriever(document_store = self.document_store)
self.pipe = ExtractiveQAPipeline(self.reader, self.retriever)
def search_by_query(self, query : str, retriever_top_k: int, reader_top_k: int, es_index: str = None) :
if es_index is not None:
self._initialize_pipeline(self.es_host, es_index, self.es_user, self.es_password)
params = {"Retriever": {"top_k": retriever_top_k}, "Reader": {"top_k": reader_top_k}}
prediction = self.pipe.run( query = query, params = params)
return prediction["answers"]
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