main.py

import json
import os

import streamlit as st
import pickle

from transformers import AutoTokenizer, BertForSequenceClassification, pipeline
from sklearn.feature_extraction.text import TfidfVectorizer


def load_models():
    st.session_state.loaded = True

    with open("models/tfidf_vectorizer_svm_model_2_classes_gpt_chatgpt_detection_tfidf_bg_0.886_F1_score.pkl", "rb") as f:
        st.session_state.tfidf_vectorizer = pickle.load(f)

    with open('models/svm_model_2_classes_gpt_chatgpt_detection_tfidf_bg_0.886_F1_score.pkl', 'rb') as f:
        st.session_state.gpt_detector = pickle.load(f)

    st.session_state.bert = pipeline(task="text-classification",
                                     model=BertForSequenceClassification.from_pretrained("TRACES/private-bert", use_auth_token=os.environ['ACCESS_TOKEN'],  num_labels=2),
                                     tokenizer=AutoTokenizer.from_pretrained("TRACES/private-bert", use_auth_token=os.environ['ACCESS_TOKEN']))


def load_content():
    with open('resource/page_content.json', encoding='utf8') as json_file:
        return json.load(json_file)


def switch_lang(lang):
    if 'lang' in st.session_state:
        if lang == 'bg':
            st.session_state.lang = 'bg'
        else:
            st.session_state.lang = 'en'


if 'lang' not in st.session_state:
    st.session_state.lang = 'bg'

if 'gpt_detector_result' not in st.session_state and 'bert_result' not in st.session_state:
    st.session_state.gpt_detector_result = ''
    st.session_state.gpt_detector_probability = [1, 0]
    st.session_state.bert_result = [{'label': '', 'score': 1}]

content = load_content()
if 'loaded' not in st.session_state:
    load_models()

#######################################################################################################################

st.title(content['title'][st.session_state.lang])

col1, col2, col3 = st.columns([1, 1, 10])
with col1:
    st.button(
        label='EN',
        key='en',
        on_click=switch_lang,
        args=['en']
    )
with col2:
    st.button(
        label='BG',
        key='bg',
        on_click=switch_lang,
        args=['bg']
    )

if 'agree' not in st.session_state:
    st.session_state.agree = False

if st.session_state.agree:
    tab_tool, tab_terms = st.tabs([content['tab_tool'][st.session_state.lang], content['tab_terms'][st.session_state.lang]])

    with tab_tool:
        user_input = st.text_area(content['textbox_title'][st.session_state.lang],
                                  content['text_placeholder'][st.session_state.lang]).strip('\n')
    
        if st.button(content['analyze_button'][st.session_state.lang]):
            user_tfidf = st.session_state.tfidf_vectorizer.transform([user_input])
    
            st.session_state.gpt_detector_result = st.session_state.gpt_detector.predict(user_tfidf)[0]
            st.session_state.gpt_detector_probability = st.session_state.gpt_detector.predict_proba(user_tfidf)[0]
            st.session_state.bert_result = st.session_state.bert(user_input)
    
        if st.session_state.gpt_detector_result == 1:
            st.warning(content['gpt_getect_yes'][st.session_state.lang] +
                       str(round(st.session_state.gpt_detector_probability[1] * 100, 2)) +
                       content['gpt_yes_proba'][st.session_state.lang], icon="⚠️")
        else:
            st.success(content['gpt_getect_no'][st.session_state.lang] +
                       str(round(st.session_state.gpt_detector_probability[0] * 100, 2)) +
                       content['gpt_no_proba'][st.session_state.lang], icon="✅")
    
        if st.session_state.bert_result[0]['label'] == 'LABEL_1':
            st.warning(content['bert_yes_1'][st.session_state.lang] +
                       str(round(st.session_state.bert_result[0]['score'] * 100, 2)) +
                       content['bert_yes_2'][st.session_state.lang], icon = "⚠️")
        else:
            st.success(content['bert_no_1'][st.session_state.lang] +
                       str(round(st.session_state.bert_result[0]['score'] * 100, 2)) +
                       content['bert_no_2'][st.session_state.lang], icon="✅")
    
        st.info(content['disinformation_definition'][st.session_state.lang], icon="ℹ️")

    with tab_terms:
        st.write(content['disclaimer'][st.session_state.lang])

else:
    st.write(content['disclaimer_title'][st.session_state.lang])
    st.write(content['disclaimer'][st.session_state.lang])
    if st.button(content['disclaimer_agree_text'][st.session_state.lang]):
        st.session_state.agree = True
        st.experimental_rerun()