app.py

import streamlit as st
import os
import json

from transformers import GPT2Tokenizer, GPT2LMHeadModel, BertTokenizer, BertModel,T5Tokenizer, T5ForConditionalGeneration,AutoTokenizer, AutoModelForSeq2SeqLM

import torch
from sklearn.metrics.pairwise import cosine_similarity
import numpy as np
import nltk
from nltk.tokenize import sent_tokenize
from nltk.corpus import stopwords

def is_new_file_upload(uploaded_file):
    if 'last_uploaded_file' in st.session_state:
        # Check if the newly uploaded file is different from the last one
        if (uploaded_file.name != st.session_state.last_uploaded_file['name'] or
                uploaded_file.size != st.session_state.last_uploaded_file['size']):
            st.session_state.last_uploaded_file = {'name': uploaded_file.name, 'size': uploaded_file.size}
            # st.write("A new src image file has been uploaded.")
            return True
        else:
            # st.write("The same src image file has been re-uploaded.")
            return False
    else:
        # st.write("This is the first file upload detected.")
        st.session_state.last_uploaded_file = {'name': uploaded_file.name, 'size': uploaded_file.size}
        return True
def combined_similarity(similarity, sentence, query):
    # Tokenize both the sentence and the query
    # sentence_words = set(sentence.split())
    # query_words = set(query.split())
    sentence_words = set(word for word in sentence.split() if word.lower() not in st.session_state.stop_words)
    query_words = set(word for word in query.split() if word.lower() not in st.session_state.stop_words)

    # Calculate the number of common words
    common_words = len(sentence_words.intersection(query_words))

    # Adjust the similarity score with the common words count
    combined_score = similarity + (common_words / max(len(query_words), 1))  # Normalize by the length of the query to keep the score between -1 and 1
    return combined_score

big_text = """
    <div style='text-align: center;'>
        <h1 style='font-size: 30x;'>Knowledge Extraction A</h1>
    </div>
    """
    # Display the styled text
st.markdown(big_text, unsafe_allow_html=True)

uploaded_json_file = st.file_uploader("Upload a pre-processed file",
                                           type=['json'])
st.markdown(
    f'<a href="https://ikmtechnology.github.io/ikmtechnology/untethered_extracted_paragraphs.json" target="_blank">Sample 1 download and then upload to above</a>',
    unsafe_allow_html=True)
st.markdown("sample queries for above file: <br/> What is death? What is a lucid dream? What is the seat of consciousness?",unsafe_allow_html=True)
if uploaded_json_file is not None:
    if is_new_file_upload(uploaded_json_file):
        print("is new file uploaded")
        save_path = './uploaded_files'
        if not os.path.exists(save_path):
            os.makedirs(save_path)
        with open(os.path.join(save_path, uploaded_json_file.name), "wb") as f:
            f.write(uploaded_json_file.getbuffer())  # Write the file to the specified location
            st.success(f'Saved file temp_{uploaded_json_file.name} in {save_path}')
            st.session_state.uploaded_path=os.path.join(save_path, uploaded_json_file.name)
            # st.session_state.page_count = utils.get_pdf_page_count(st.session_state.uploaded_pdf_path)
            # print("page_count=",st.session_state.page_count)
        content = uploaded_json_file.read()
        try:
            st.session_state.restored_paragraphs = json.loads(content)
            #print(data)
            # Check if the parsed data is a dictionary
            if isinstance(st.session_state.restored_paragraphs, list):
                # Count the restored_paragraphs of top-level elements
                st.session_state.list_count  = len(st.session_state.restored_paragraphs)
                st.write(f'The number of elements at the top level of the hierarchy: {st.session_state.list_count }')
            else:
                st.write('The JSON content is not a dictionary.')
        except json.JSONDecodeError:
            st.write('Invalid JSON file.')
        st.rerun()
if 'is_initialized' not in st.session_state:
    st.session_state['is_initialized'] = True

    nltk.download('punkt')
    nltk.download('stopwords')
    st.session_state.stop_words = set(stopwords.words('english'))
    st.session_state.bert_tokenizer = BertTokenizer.from_pretrained("bert-base-uncased", )
    st.session_state.bert_model = BertModel.from_pretrained("bert-base-uncased", ).to('cuda')

if 'list_count' in st.session_state:
    st.write(f'The number of elements at the top level of the hierarchy: {st.session_state.list_count }')
    if 'paragraph_sentence_encodings' not in st.session_state:
        print("start embedding paragarphs")
        read_progress_bar = st.progress(0)
        st.session_state.paragraph_sentence_encodings = []
        for index,paragraph in enumerate(st.session_state.restored_paragraphs):
            #print(paragraph)

            progress_percentage = (index) / (st.session_state.list_count - 1)
            # print(progress_percentage)
            read_progress_bar.progress(progress_percentage)

            sentence_encodings = []
            sentences = sent_tokenize(paragraph['text'])
            for sentence in sentences:
                if sentence.strip().endswith('?'):
                    sentence_encodings.append(None)
                    continue
                if len(sentence.strip()) < 4:
                    sentence_encodings.append(None)
                    continue
                sentence_tokens = st.session_state.bert_tokenizer(sentence, return_tensors="pt", padding=True, truncation=True).to('cuda')
                with torch.no_grad():
                    sentence_encoding = st.session_state.bert_model(**sentence_tokens).last_hidden_state[:, 0, :].cpu().numpy()
                sentence_encodings.append([sentence, sentence_encoding])
                # sentence_encodings.append([sentence,bert_model(**sentence_tokens).last_hidden_state[:, 0, :].detach().numpy()])
            st.session_state.paragraph_sentence_encodings.append([paragraph, sentence_encodings])
        st.rerun()
if 'paragraph_sentence_encodings' in st.session_state:
    query = st.text_input("Enter your query")
    if query:
        query_tokens = st.session_state.bert_tokenizer(query, return_tensors="pt", padding=True, truncation=True).to('cuda')
        with torch.no_grad():  # Disable gradient calculation for inference
            # Perform the forward pass on the GPU
            query_encoding = st.session_state.bert_model(**query_tokens).last_hidden_state[:, 0,
                             :].cpu().numpy()  # Move the result to CPU and convert to NumPy
        paragraph_scores = []
        sentence_scores = []
        sentence_encoding = []
        total_count=len(st.session_state.paragraph_sentence_encodings)
        processing_progress_bar = st.progress(0)
        for index,paragraph_sentence_encoding in enumerate(st.session_state.paragraph_sentence_encodings):
            progress_percentage = index / (total_count- 1)
            processing_progress_bar.progress(progress_percentage)
            best_similarity = -1
            sentence_similarities = []
            for sentence_encoding in paragraph_sentence_encoding[1]:
                if sentence_encoding:
                    similarity = cosine_similarity(query_encoding, sentence_encoding[1])[0][0]
                    # adjusted_similarity = similarity*len(sentence_encoding[0].split())**0.5
                    combined_score = combined_similarity(similarity, sentence_encoding[0], query)

                    # print("sentence="+sentence_encoding[0] + " len="+str())

                    sentence_similarities.append(combined_score)
                    sentence_scores.append((combined_score, sentence_encoding[0]))
                    # best_similarity = max(best_similarity, similarity)
            sentence_similarities.sort(reverse=True)

            # Calculate the average of the top three sentence similarities
            if len(sentence_similarities) >= 3:
                top_three_avg_similarity = np.mean(sentence_similarities[:3])
            elif sentence_similarities:
                top_three_avg_similarity = np.mean(sentence_similarities)
            else:
                top_three_avg_similarity = 0
            paragraph_scores.append((top_three_avg_similarity, paragraph_sentence_encoding[0]))
        sentence_scores = sorted(sentence_scores, key=lambda x: x[0], reverse=True)
        # Display the scores and sentences
        # print("Top scored sentences and their scores:")
        # for score, sentence in sentence_scores:  # Print top 10 for demonstration
        #     print(f"Score: {score:.4f}, Sentence: {sentence}")
        # Sort the paragraphs by their best similarity score
        paragraph_scores = sorted(paragraph_scores, key=lambda x: x[0], reverse=True)

        # Debug prints to understand the scores and paragraphs
        st.write("Top scored paragraphs and their scores:")
        for score, paragraph in paragraph_scores[:5]:  # Print top 5 for debugging

            st.write(f"Score: {score}, Paragraph: {paragraph['text']}")