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import streamlit as st
import pysbd
from transformers import pipeline
from sentence_transformers import CrossEncoder
from transformers import AutoTokenizer, AutoModelWithLMHead, pipeline
class QuestionAnswering:
def __init__(self):
model_name = "MaRiOrOsSi/t5-base-finetuned-question-answering"
self.tokenizer = AutoTokenizer.from_pretrained(model_name)
self.model = AutoModelWithLMHead.from_pretrained(model_name)
self.sentence_segmenter = pysbd.Segmenter(language='en',clean=False)
self.passage_retreival_model = CrossEncoder('cross-encoder/ms-marco-MiniLM-L-6-v2')
self.qa_model = pipeline("question-answering",'a-ware/bart-squadv2')
def fetch_answers(self, question, document):
document_paragraphs = document.splitlines()
query_paragraph_list = [(question, para) for para in document_paragraphs if len(para.strip()) > 0 ]
scores = self.passage_retreival_model.predict(query_paragraph_list)
top_5_indices = scores.argsort()[-3:]
top_5_query_paragraph_list = [query_paragraph_list[i] for i in top_5_indices ]
top_5_query_paragraph_list.reverse()
top_5_query_paragraph_answer_list = ""
count = 1
for query, passage in top_5_query_paragraph_list:
passage_sentences = self.sentence_segmenter.segment(passage)
answer = self.qa_model(question = query, context = passage)['answer']
evidence_sentence = ""
for i in range(len(passage_sentences)):
if answer.startswith('.') or answer.startswith(':'):
answer = answer[1:].strip()
if answer in passage_sentences[i]:
evidence_sentence = evidence_sentence + " " + passage_sentences[i]
model_input = f"question: {query} context: {evidence_sentence}"
encoded_input = self.tokenizer([model_input],
return_tensors='pt',
max_length=512,
truncation=True)
output = self.model.generate(input_ids = encoded_input.input_ids,
attention_mask = encoded_input.attention_mask)
output_answer = self.tokenizer.decode(output[0], skip_special_tokens=True)
result_str = ""+str(count)+": "+ output_answer +"\n"
result_str = result_str + " "+ evidence_sentence + "\n\n"
top_5_query_paragraph_answer_list += result_str
count+=1
return top_5_query_paragraph_answer_list
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