import os import json import re import gradio as gr import pandas as pd import requests import random import urllib.parse from tempfile import NamedTemporaryFile from typing import List from bs4 import BeautifulSoup from langchain.prompts import PromptTemplate from langchain.chains import LLMChain from langchain_core.prompts import ChatPromptTemplate from langchain_community.vectorstores import FAISS from langchain_community.document_loaders import PyPDFLoader from langchain_core.output_parsers import StrOutputParser from langchain_community.embeddings import HuggingFaceEmbeddings from langchain_community.llms import HuggingFaceHub from langchain_core.documents import Document # Add this line huggingface_token = os.environ.get("HUGGINGFACE_TOKEN") def load_document(file: NamedTemporaryFile) -> List[Document]: """Loads and splits the document into pages.""" loader = PyPDFLoader(file.name) return loader.load_and_split() def update_vectors(files): if not files: return "Please upload at least one PDF file." embed = get_embeddings() total_chunks = 0 all_data = [] for file in files: data = load_document(file) all_data.extend(data) total_chunks += len(data) if os.path.exists("faiss_database"): database = FAISS.load_local("faiss_database", embed, allow_dangerous_deserialization=True) database.add_documents(all_data) else: database = FAISS.from_documents(all_data, embed) database.save_local("faiss_database") return f"Vector store updated successfully. Processed {total_chunks} chunks from {len(files)} files." def get_embeddings(): return HuggingFaceEmbeddings(model_name="sentence-transformers/all-mpnet-base-v2") def clear_cache(): if os.path.exists("faiss_database"): os.remove("faiss_database") return "Cache cleared successfully." else: return "No cache to clear." def get_model(temperature, top_p, repetition_penalty): return HuggingFaceHub( repo_id="mistralai/Mistral-7B-Instruct-v0.3", model_kwargs={ "temperature": temperature, "top_p": top_p, "repetition_penalty": repetition_penalty, "max_length": 1000 }, huggingfacehub_api_token=huggingface_token ) def generate_chunked_response(model, prompt, max_tokens=1000, max_chunks=5): full_response = "" for i in range(max_chunks): try: chunk = model(prompt + full_response, max_new_tokens=max_tokens) chunk = chunk.strip() if chunk.endswith((".", "!", "?")): full_response += chunk break full_response += chunk except Exception as e: print(f"Error in generate_chunked_response: {e}") break return full_response.strip() def extract_text_from_webpage(html): soup = BeautifulSoup(html, 'html.parser') for script in soup(["script", "style"]): script.extract() text = soup.get_text() lines = (line.strip() for line in text.splitlines()) chunks = (phrase.strip() for line in lines for phrase in line.split(" ")) text = '\n'.join(chunk for chunk in chunks if chunk) return text _useragent_list = [ "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Edge/91.0.864.59 Safari/537.36", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Edge/91.0.864.59 Safari/537.36", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Safari/537.36", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Safari/537.36", ] def google_search(term, num_results=5, lang="en", timeout=5, safe="active", ssl_verify=None): escaped_term = urllib.parse.quote_plus(term) start = 0 all_results = [] max_chars_per_page = 8000 print(f"Starting Google search for term: '{term}'") with requests.Session() as session: while start < num_results: try: user_agent = random.choice(_useragent_list) headers = { 'User-Agent': user_agent } resp = session.get( url="https://www.google.com/search", headers=headers, params={ "q": term, "num": num_results - start, "hl": lang, "start": start, "safe": safe, }, timeout=timeout, verify=ssl_verify, ) resp.raise_for_status() print(f"Successfully retrieved search results page (start={start})") except requests.exceptions.RequestException as e: print(f"Error retrieving search results: {e}") break soup = BeautifulSoup(resp.text, "html.parser") result_block = soup.find_all("div", attrs={"class": "g"}) if not result_block: print("No results found on this page") break print(f"Found {len(result_block)} results on this page") for result in result_block: link = result.find("a", href=True) if link: link = link["href"] print(f"Processing link: {link}") try: webpage = session.get(link, headers=headers, timeout=timeout) webpage.raise_for_status() visible_text = extract_text_from_webpage(webpage.text) if len(visible_text) > max_chars_per_page: visible_text = visible_text[:max_chars_per_page] + "..." all_results.append({"link": link, "text": visible_text}) print(f"Successfully extracted text from {link}") except requests.exceptions.RequestException as e: print(f"Error retrieving webpage content: {e}") all_results.append({"link": link, "text": None}) else: print("No link found for this result") all_results.append({"link": None, "text": None}) start += len(result_block) print(f"Search completed. Total results: {len(all_results)}") if not all_results: print("No search results found. Returning a default message.") return [{"link": None, "text": "No information found in the web search results."}] return all_results def rephrase_for_search(query, model): rephrase_prompt = PromptTemplate( input_variables=["query"], template=""" Your task is to rephrase the given conversational query into a concise, search-engine-friendly format. Remove any conversational elements and focus on the core information need. Provide ONLY the rephrased query without any additional text or explanations. Conversational query: {query} Rephrased query:""" ) chain = LLMChain(llm=model, prompt=rephrase_prompt) response = chain.run(query=query).strip() rephrased_query = response.replace("Rephrased query:", "").strip() if rephrased_query.lower() == query.lower() or len(rephrased_query) > len(query) * 1.5: common_words = set(['the', 'a', 'an', 'in', 'on', 'at', 'to', 'for', 'of', 'with', 'by', 'from', 'up', 'about', 'into', 'over', 'after']) keywords = [word.lower() for word in query.split() if word.lower() not in common_words] keywords = [word for word in keywords if word.isalnum()] return ' '.join(keywords) return rephrased_query def ask_question(question, temperature, top_p, repetition_penalty, web_search): if not question: return "Please enter a question." model = get_model(temperature, top_p, repetition_penalty) embed = get_embeddings() if os.path.exists("faiss_database"): database = FAISS.load_local("faiss_database", embed, allow_dangerous_deserialization=True) else: database = None max_attempts = 3 context_reduction_factor = 0.7 for attempt in range(max_attempts): try: if web_search: original_query = question rephrased_query = rephrase_for_search(original_query, model) print(f"Original query: {original_query}") print(f"Rephrased query: {rephrased_query}") if rephrased_query == original_query: print("Warning: Query was not rephrased. Using original query for search.") search_results = google_search(rephrased_query) web_docs = [Document(page_content=result["text"], metadata={"source": result["link"]}) for result in search_results if result["text"]] if database is None: database = FAISS.from_documents(web_docs, embed) else: database.add_documents(web_docs) database.save_local("faiss_database") context_str = "\n".join([f"Source: {doc.metadata['source']}\nContent: {doc.page_content}" for doc in web_docs]) prompt_template = """ Answer the question based on the following web search results: Web Search Results: {context} Original Question: {original_question} Rephrased Search Query: {rephrased_query} If the web search results don't contain relevant information, state that the information is not available in the search results. Provide a concise and direct answer to the original question without mentioning the web search or these instructions. Do not include any source information in your answer. """ prompt_val = ChatPromptTemplate.from_template(prompt_template) formatted_prompt = prompt_val.format(context=context_str, original_question=question, rephrased_query=rephrased_query) else: if database is None: return "No documents available. Please upload documents or enable web search to answer questions." retriever = database.as_retriever() relevant_docs = retriever.get_relevant_documents(question) context_str = "\n".join([doc.page_content for doc in relevant_docs]) # Reduce context if we're not on the first attempt if attempt > 0: words = context_str.split() context_str = " ".join(words[:int(len(words) * context_reduction_factor)]) prompt_template = """ Answer the question based on the following context: Context: {context} Current Question: {question} If the context doesn't contain relevant information, state that the information is not available. Provide a concise and direct answer to the question. Do not include any source information in your answer. """ prompt_val = ChatPromptTemplate.from_template(prompt_template) formatted_prompt = prompt_val.format(context=context_str, question=question) full_response = generate_chunked_response(model, formatted_prompt) answer_patterns = [ r"Provide a concise and direct answer to the question without mentioning the web search or these instructions:", r"Provide a concise and direct answer to the question:", r"Answer:", r"Provide a concise and direct answer to the original question without mentioning the web search or these instructions:" ] for pattern in answer_patterns: match = re.split(pattern, full_response, flags=re.IGNORECASE) if len(match) > 1: answer = match[-1].strip() break else: answer = full_response.strip() # Add sources section if web_search: sources = set(doc.metadata['source'] for doc in web_docs) sources_section = "\n\nSources:\n" + "\n".join(f"- {source}" for source in sources) answer += sources_section return answer except Exception as e: print(f"Error in ask_question (attempt {attempt + 1}): {e}") if "Input validation error" in str(e) and attempt < max_attempts - 1: print(f"Reducing context length for next attempt") elif attempt == max_attempts - 1: return f"I apologize, but I'm having trouble processing your question due to its length or complexity. Could you please try rephrasing it more concisely?" return "An unexpected error occurred. Please try again later." # Gradio interface with gr.Blocks() as demo: gr.Markdown("# Chat with your PDF documents and Web Search") with gr.Row(): file_input = gr.Files(label="Upload your PDF documents", file_types=[".pdf"]) update_button = gr.Button("Update Vector Store") update_output = gr.Textbox(label="Update Status") update_button.click(update_vectors, inputs=[file_input], outputs=update_output) with gr.Row(): with gr.Column(scale=2): chatbot = gr.Chatbot(label="Conversation") question_input = gr.Textbox(label="Ask a question about your documents or use web search") submit_button = gr.Button("Submit") with gr.Column(scale=1): temperature_slider = gr.Slider(label="Temperature", minimum=0.0, maximum=1.0, value=0.5, step=0.1) top_p_slider = gr.Slider(label="Top P", minimum=0.0, maximum=1.0, value=0.9, step=0.1) repetition_penalty_slider = gr.Slider(label="Repetition Penalty", minimum=1.0, maximum=2.0, value=1.0, step=0.1) web_search_checkbox = gr.Checkbox(label="Enable Web Search", value=False) def chat(question, history, temperature, top_p, repetition_penalty, web_search): answer = ask_question(question, temperature, top_p, repetition_penalty, web_search) history.append((question, answer)) return "", history submit_button.click(chat, inputs=[question_input, chatbot, temperature_slider, top_p_slider, repetition_penalty_slider, web_search_checkbox], outputs=[question_input, chatbot]) clear_button = gr.Button("Clear Cache") clear_output = gr.Textbox(label="Cache Status") clear_button.click(clear_cache, inputs=[], outputs=clear_output) if __name__ == "__main__": demo.launch()