app.py

import streamlit as st
from transformers import T5ForConditionalGeneration, T5Tokenizer
import spacy
import nltk
from sklearn.feature_extraction.text import TfidfVectorizer
from rake_nltk import Rake
import pandas as pd
from fpdf import FPDF
import wikipediaapi
from functools import lru_cache
nltk.download('punkt')
nltk.download('stopwords')
nltk.download('brown')
from nltk.tokenize import sent_tokenize
nltk.download('wordnet')
from nltk.corpus import wordnet
import random
from sense2vec import Sense2Vec
import sense2vec
from wordcloud import WordCloud
import matplotlib.pyplot as plt
import json
import os
from sentence_transformers import SentenceTransformer, util
import textstat
from spellchecker import SpellChecker
from transformers import pipeline
import re
import pymupdf
print("***************************************************************")

st.set_page_config(
    page_title="Question Generator",
    initial_sidebar_state="auto",
    menu_items={
        "About" : "#Hi this our project."
    }
)

# Initialize Wikipedia API with a user agent
user_agent = 'QGen/1.0 ([email protected])'
wiki_wiki = wikipediaapi.Wikipedia(user_agent= user_agent,language='en')


@st.cache_resource
def load_model():
    model_name = "DevBM/t5-large-squad"
    model = T5ForConditionalGeneration.from_pretrained(model_name)
    tokenizer = T5Tokenizer.from_pretrained(model_name)
    return model, tokenizer

# Load Spacy Model
@st.cache_resource
def load_nlp_models():
    nlp = spacy.load("en_core_web_md")
    s2v = sense2vec.Sense2Vec().from_disk('s2v_old')
    return nlp, s2v

# Load Quality Assurance Models
@st.cache_resource
def load_qa_models():
    # Initialize BERT model for sentence similarity
    similarity_model = SentenceTransformer('all-MiniLM-L6-v2')

    spell = SpellChecker()
    return similarity_model, spell

nlp, s2v = load_nlp_models()
model, tokenizer = load_model()
similarity_model, spell = load_qa_models()
context_model = similarity_model

def get_pdf_text(pdf_file):
    doc = pymupdf.open(stream=pdf_file.read(), filetype="pdf")
    text = ""
    for page_num in range(doc.page_count):
        page = doc.load_page(page_num)
        text += page.get_text()
    return text
def save_feedback(question, answer,rating):
    feedback_file = 'question_feedback.json'
    if os.path.exists(feedback_file):
        with open(feedback_file, 'r') as f:
            feedback_data = json.load(f)
    else:
        feedback_data = []
    tpl = {
        'question' : question,
        'answer' : answer,
        'rating' : rating,
    }
    # feedback_data[question] = rating
    feedback_data.append(tpl)
    
    with open(feedback_file, 'w') as f:
        json.dump(feedback_data, f)


# Function to clean text
def clean_text(text):
    text = re.sub(r"[^\x00-\x7F]", " ", text)
    return text

# Function to create text chunks
def segment_text(text, max_segment_length=1000):
    """Segment the text into smaller chunks."""
    sentences = sent_tokenize(text)
    segments = []
    current_segment = ""
    
    for sentence in sentences:
        if len(current_segment) + len(sentence) <= max_segment_length:
            current_segment += sentence + " "
        else:
            segments.append(current_segment.strip())
            current_segment = sentence + " "
    
    if current_segment:
        segments.append(current_segment.strip())
    print(f"\n\nSegement Chunks: {segments}\n\n")
    return segments

# Function to extract keywords using combined techniques
def extract_keywords(text, extract_all):
    doc = nlp(text)
    spacy_keywords = set([ent.text for ent in doc.ents])
    spacy_entities = spacy_keywords
    print(f"\n\nSpacy Entities: {spacy_entities} \n\n")  

    # Use Only Spacy Entities
    if extract_all is False:
        return list(spacy_entities) 
    
    # Use RAKE
    rake = Rake()
    rake.extract_keywords_from_text(text)
    rake_keywords = set(rake.get_ranked_phrases())
    print(f"\n\nRake Keywords: {rake_keywords} \n\n")
    # Use spaCy for NER and POS tagging
    spacy_keywords.update([token.text for token in doc if token.pos_ in ["NOUN", "PROPN", "VERB", "ADJ"]])
    print(f"\n\nSpacy Keywords: {spacy_keywords} \n\n")
    # Use TF-IDF
    vectorizer = TfidfVectorizer(stop_words='english')
    X = vectorizer.fit_transform([text])
    tfidf_keywords = set(vectorizer.get_feature_names_out())
    print(f"\n\nTFIDF Entities: {tfidf_keywords} \n\n")

    # Combine all keywords
    combined_keywords = rake_keywords.union(spacy_keywords).union(tfidf_keywords)
    
    return list(combined_keywords)

def get_similar_words_sense2vec(word, n=3):
    # Try to find the word with its most likely part-of-speech
    word_with_pos = word + "|NOUN"
    if word_with_pos in s2v:
        similar_words = s2v.most_similar(word_with_pos, n=n)
        return [word.split("|")[0] for word, _ in similar_words]
    
    # If not found, try without POS
    if word in s2v:
        similar_words = s2v.most_similar(word, n=n)
        return [word.split("|")[0] for word, _ in similar_words]
    
    return []

def get_synonyms(word, n=3):
    synonyms = []
    for syn in wordnet.synsets(word):
        for lemma in syn.lemmas():
            if lemma.name() != word and lemma.name() not in synonyms:
                synonyms.append(lemma.name())
                if len(synonyms) == n:
                    return synonyms
    return synonyms

def generate_options(answer, context, n=3):
    options = [answer]
    

    # Add contextually relevant words using a pre-trained model
    context_embedding = context_model.encode(context)
    answer_embedding = context_model.encode(answer)
    context_words = [token.text for token in nlp(context) if token.is_alpha and token.text.lower() != answer.lower()]

    # Compute similarity scores and sort context words
    similarity_scores = [util.pytorch_cos_sim(context_model.encode(word), answer_embedding).item() for word in context_words]
    sorted_context_words = [word for _, word in sorted(zip(similarity_scores, context_words), reverse=True)]
    options.extend(sorted_context_words[:n])

    # Try to get similar words based on sense2vec
    similar_words = get_similar_words_sense2vec(answer, n)
    options.extend(similar_words)
    
    # If we don't have enough options, try synonyms
    if len(options) < n + 1:
        synonyms = get_synonyms(answer, n - len(options) + 1)
        options.extend(synonyms)
    
    # If we still don't have enough options, extract other entities from the context
    if len(options) < n + 1:
        doc = nlp(context)
        entities = [ent.text for ent in doc.ents if ent.text.lower() != answer.lower()]
        options.extend(entities[:n - len(options) + 1])
    
    # If we still need more options, add some random words from the context
    if len(options) < n + 1:
        context_words = [token.text for token in nlp(context) if token.is_alpha and token.text.lower() != answer.lower()]
        options.extend(random.sample(context_words, min(n - len(options) + 1, len(context_words))))
    print(f"\n\nAll Possible Options: {options}\n\n")    
    # Ensure we have the correct number of unique options
    options = list(dict.fromkeys(options))[:n+1]
    
    # Shuffle the options
    random.shuffle(options)
    
    return options

# Function to map keywords to sentences with customizable context window size
def map_keywords_to_sentences(text, keywords, context_window_size):
    sentences = sent_tokenize(text)
    keyword_sentence_mapping = {}
    print(f"\n\nSentences: {sentences}\n\n")
    for keyword in keywords:
        for i, sentence in enumerate(sentences):
            if keyword in sentence:
                # Combine current sentence with surrounding sentences for context
                start = max(0, i - context_window_size)
                end = min(len(sentences), i + context_window_size + 1)
                context = ' '.join(sentences[start:end])
                if keyword not in keyword_sentence_mapping:
                    keyword_sentence_mapping[keyword] = context
                else:
                    keyword_sentence_mapping[keyword] += ' ' + context
    return keyword_sentence_mapping


# Function to perform entity linking using Wikipedia API
@lru_cache(maxsize=128)
def entity_linking(keyword):
    page = wiki_wiki.page(keyword)
    if page.exists():
        return page.fullurl
    return None

# Function to generate questions using beam search
def generate_question(context, answer, num_beams):
    input_text = f"<context> {context} <answer> {answer}"
    input_ids = tokenizer.encode(input_text, return_tensors='pt')
    outputs = model.generate(input_ids, num_beams=num_beams, early_stopping=True)
    question = tokenizer.decode(outputs[0], skip_special_tokens=True)
    return question

# Function to export questions to CSV
def export_to_csv(data):
    # df = pd.DataFrame(data, columns=["Context", "Answer", "Question", "Options"])
    df = pd.DataFrame(data)
    # csv = df.to_csv(index=False,encoding='utf-8')
    csv = df.to_csv(index=False)
    return csv

# Function to export questions to PDF
def export_to_pdf(data):
    pdf = FPDF()
    pdf.add_page()
    pdf.set_font("Arial", size=12)
    
    for item in data:
        pdf.multi_cell(0, 10, f"Context: {item['context']}")
        pdf.multi_cell(0, 10, f"Question: {item['question']}")
        pdf.multi_cell(0, 10, f"Answer: {item['answer']}")
        pdf.multi_cell(0, 10, f"Options: {', '.join(item['options'])}")
        pdf.multi_cell(0, 10, f"Overall Score: {item['overall_score']:.2f}")
        pdf.ln(10)
    
    return pdf.output(dest='S').encode('latin-1')

def display_word_cloud(generated_questions):
    word_frequency = {}
    for question in generated_questions:
        words = question.split()
        for word in words:
            word_frequency[word] = word_frequency.get(word, 0) + 1

    wordcloud = WordCloud(width=800, height=400, background_color='white').generate_from_frequencies(word_frequency)
    plt.figure(figsize=(10, 5))
    plt.imshow(wordcloud, interpolation='bilinear')
    plt.axis('off')
    st.pyplot()


def assess_question_quality(context, question, answer):
    # Assess relevance using cosine similarity
    context_doc = nlp(context)
    question_doc = nlp(question)
    relevance_score = context_doc.similarity(question_doc)

    # Assess complexity using token length (as a simple metric)
    complexity_score = min(len(question_doc) / 20, 1)  # Normalize to 0-1

    # Assess Spelling correctness
    misspelled = spell.unknown(question.split())
    spelling_correctness = 1 - (len(misspelled) / len(question.split()))  # Normalize to 0-1

    # Calculate overall score (you can adjust weights as needed)
    overall_score = (
        0.4 * relevance_score +
        0.4 * complexity_score +
        0.2 * spelling_correctness
    )

    return overall_score, relevance_score, complexity_score, spelling_correctness

def main():
    # Streamlit interface
    st.title(":blue[Question Generator System]")

    # Initialize session state
    if 'generated_questions' not in st.session_state:
        st.session_state.generated_questions = []

    with st.sidebar:
        st.subheader("Customization Options")
        # Customization options
        input_type = st.radio("Select Input Preference", ("Text Input","Upload PDF"))
        num_beams = st.slider("Select number of beams for question generation", min_value=1, max_value=10, value=5)
        context_window_size = st.slider("Select context window size (number of sentences before and after)", min_value=1, max_value=5, value=1)
        num_questions = st.slider("Select number of questions to generate", min_value=1, max_value=1000, value=5)
        with st.expander("Choose the Additional Elements to show"):
            show_context = st.checkbox("Context",True)
            show_answer = st.checkbox("Answer",True)
            show_options = st.checkbox("Options",False)
            show_entity_link = st.checkbox("Entity Link For Wikipedia",True)
            show_qa_scores = st.checkbox("QA Score",False)
        col1, col2 = st.columns(2)
        with col1:
            extract_all_keywords = st.toggle("Extract Max Keywords",value=False)
        with col2:
            enable_feedback_mode = st.toggle("Enable Feedback Mode",False)
    text = None
    if input_type == "Text Input":
        text = st.text_area("Enter text here:", value="Joe Biden, the current US president is on a weak wicket going in for his reelection later this November against former President Donald Trump.")
    elif input_type == "Upload PDF":
        file = st.file_uploader("Upload PDF Files")
        if file is not None:
            text = get_pdf_text(file)
    if text:
        text = clean_text(text)
        segments = segment_text(text)
    generate_questions_button = st.button("Generate Questions")
    if generate_questions_button and text:
        st.session_state.generated_questions = []
        for text in segments:
            keywords = extract_keywords(text, extract_all_keywords)
            print(f"\n\nFinal Keywords in Main Function: {keywords}\n\n")
            keyword_sentence_mapping = map_keywords_to_sentences(text, keywords, context_window_size)
            for i, (keyword, context) in enumerate(keyword_sentence_mapping.items()):
                if i >= num_questions:
                    break
                question = generate_question(context, keyword, num_beams=num_beams)
                options = generate_options(keyword,context)
                overall_score, relevance_score, complexity_score, spelling_correctness = assess_question_quality(context,question,keyword)
                if overall_score < 0.5:
                    continue
                tpl = {
                    "question" : question,
                    "context" : context,
                    "answer" : keyword,
                    "options" : options,
                    "overall_score" : overall_score,
                    "relevance_score" : relevance_score,
                    "complexity_score" : complexity_score,
                    "spelling_correctness" : spelling_correctness,
                }
                st.session_state.generated_questions.append(tpl)
    
    # sort question based on their quality score
    st.session_state.generated_questions = sorted(st.session_state.generated_questions,key = lambda x: x['overall_score'], reverse=True)
    # Display generated questions
    if st.session_state.generated_questions:
        st.header("Generated Questions:",divider='blue')
        for i, q in enumerate(st.session_state.generated_questions):
            # with st.expander(f"Question {i+1}"):
            st.subheader(body=f":orange[Q{i+1}:] {q['question']}")

            if show_context is True:
                st.write(f"**Context:** {q['context']}")
            if show_answer is True:
                st.write(f"**Answer:** {q['answer']}")
            if show_options is True:
                st.write(f"**Options:**")
                for j, option in enumerate(q['options']):
                    st.write(f"{chr(65+j)}. {option}")
            if show_entity_link is True:
                linked_entity = entity_linking(q['answer'])
                if linked_entity:
                    st.write(f"**Entity Link:** {linked_entity}")
            if show_qa_scores is True:
                st.write(f"**Overall Quality Score:** {q['overall_score']:.2f}")
                st.write(f"**Relevance Score:** {q['relevance_score']:.2f}")
                st.write(f"**Complexity Score:** {q['complexity_score']:.2f}")
                st.write(f"**Spelling Correctness:** {q['spelling_correctness']:.2f}")

            # q['context'] = st.text_area(f"Edit Context {i+1}:", value=q['context'], key=f"context_{i}")
            if enable_feedback_mode:
                q['question'] = st.text_input(f"Edit Question {i+1}:", value=q['question'], key=f"question_{i}")
                q['rating'] = st.selectbox(f"Rate this question (1-5)", options=[1, 2, 3, 4, 5], key=f"rating_{i}")
                if st.button(f"Submit Feedback for Question {i+1}", key=f"submit_{i}"):
                    save_feedback(q['question'], q['answer'], q['rating'])
                    st.success(f"Feedback submitted for Question {i+1}")
            st.write("---")

        # Export buttons
        if st.session_state.generated_questions:
            with st.sidebar:
                csv_data = export_to_csv(st.session_state.generated_questions)
                st.download_button(label="Download CSV", data=csv_data, file_name='questions.csv', mime='text/csv')

                pdf_data = export_to_pdf(st.session_state.generated_questions)
                st.download_button(label="Download PDF", data=pdf_data, file_name='questions.pdf', mime='application/pdf')

        # View Feedback Statistics
        with st.expander("View Feedback Statistics"):
            feedback_file = 'question_feedback.json'
            if os.path.exists(feedback_file):
                with open(feedback_file, 'r') as f:
                    feedback_data = json.load(f)
                
                st.subheader("Feedback Statistics")
                
                # Calculate average rating
                ratings = [feedback['rating'] for feedback in feedback_data]
                avg_rating = sum(ratings) / len(ratings) if ratings else 0
                st.write(f"Average Question Rating: {avg_rating:.2f}")
                
                # Show distribution of ratings
                rating_counts = {i: ratings.count(i) for i in range(1, 6)}
                st.bar_chart(rating_counts)
                    
                # Show some highly rated questions
                st.subheader("Highly Rated Questions")
                sorted_feedback = sorted(feedback_data, key=lambda x: x['rating'], reverse=True)
                top_questions = sorted_feedback[:5]
                for feedback in top_questions:
                    st.write(f"Question: {feedback['question']}")
                    st.write(f"Answer: {feedback['answer']}")
                    st.write(f"Rating: {feedback['rating']}")
                    st.write("---")
            else:
                st.write("No feedback data available yet.")

        print("********************************************************************************")

if __name__ == '__main__':
    main()