import urllib.request import fitz import re import numpy as np import tensorflow_hub as hub import openai import gradio as gr import os from sklearn.neighbors import NearestNeighbors import requests from cachetools import cached, TTLCache def download_pdf(url, output_path): urllib.request.urlretrieve(url, output_path) def preprocess(text): text = text.replace('\n', ' ') text = re.sub('\s+', ' ', text) return text def pdf_to_text(path, start_page=1, end_page=None): doc = fitz.open(path) total_pages = doc.page_count if end_page is None: end_page = total_pages text_list = [] for i in range(start_page - 1, end_page): text = doc.load_page(i).get_text("text") text = preprocess(text) text_list.append(text) doc.close() return text_list def text_to_chunks(texts, word_length=150, start_page=1): text_toks = [t.split(' ') for t in texts] page_nums = [] chunks = [] for idx, words in enumerate(text_toks): for i in range(0, len(words), word_length): chunk = words[i:i + word_length] if (i + word_length) > len(words) and (len(chunk) < word_length) and ( len(text_toks) != (idx + 1)): text_toks[idx + 1] = chunk + text_toks[idx + 1] continue chunk = ' '.join(chunk).strip() chunk = f'[Page no. {idx + start_page}]' + ' ' + '"' + chunk + '"' chunks.append(chunk) return chunks class SemanticSearch: def __init__(self): self.use = hub.load('https://tfhub.dev/google/universal-sentence-encoder/4') self.fitted = False def fit(self, data, batch=1000, n_neighbors=5): self.data = data self.embeddings = self.get_text_embedding(data, batch=batch) n_neighbors = min(n_neighbors, len(self.embeddings)) self.nn = NearestNeighbors(n_neighbors=n_neighbors) self.nn.fit(self.embeddings) self.fitted = True def __call__(self, text, return_data=True): inp_emb = self.use([text]) neighbors = self.nn.kneighbors(inp_emb, return_distance=False)[0] if return_data: return [self.data[i] for i in neighbors] else: return neighbors def get_text_embedding(self, texts, batch=1000): embeddings = [] for i in range(0, len(texts), batch): text_batch = texts[i:(i + batch)] emb_batch = self.use(text_batch) embeddings.append(emb_batch) embeddings = np.vstack(embeddings) return embeddings def load_recommender(path, start_page=1): global recommender texts = pdf_to_text(path, start_page=start_page) chunks = text_to_chunks(texts, start_page=start_page) recommender.fit(chunks) return 'Corpus Loaded.' def generate_text(openAI_key, prompt, model="gpt-3.5-turbo"): openai.api_key = openAI_key temperature = 0.7 max_tokens = 256 top_p = 1 frequency_penalty = 0 presence_penalty = 0 if model == "text-davinci-003": completions = openai.Completion.create( engine=model, prompt=prompt, max_tokens=max_tokens, n=1, stop=None, temperature=temperature, ) message = completions.choices[0].text else: message = openai.ChatCompletion.create( model=model, messages=[ {"role": "system", "content": "You are a helpful assistant."}, {"role": "assistant", "content": "Here is some initial assistant message."}, {"role": "user", "content": prompt} ], temperature=.3, max_tokens=max_tokens, top_p=top_p, frequency_penalty=frequency_penalty, presence_penalty=presence_penalty, ).choices[0].message['content'] return message def generate_answer(question, openAI_key, model): topn_chunks = recommender(question) prompt = 'search results:\n\n' for c in topn_chunks: prompt += c + '\n\n' prompt += "Instructions: Compose a comprehensive reply to the query using the search results given. " \ "Cite each reference using [ Page Number] notation. " \ "Only answer what is asked. The answer should be short and concise. \n\nQuery: " prompt += f"{question}\nAnswer:" answer = generate_text(openAI_key, prompt, model) return answer def question_answer(chat_history, url, file, question, openAI_key, model): try: if openAI_key.strip() == '': return '[ERROR]: Please enter your Open AI Key. Get your key here : https://platform.openai.com/account/api-keys' if url.strip() == '' and file is None: return '[ERROR]: Both URL and PDF is empty. Provide at least one.' if url.strip() != '' and file is not None: return '[ERROR]: Both URL and PDF is provided. Please provide only one (either URL or PDF).' if model is None or model == '': return '[ERROR]: You have not selected any model. Please choose an LLM model.' if url.strip() != '': glob_url = url download_pdf(glob_url, 'corpus.pdf') load_recommender('corpus.pdf') else: old_file_name = file.name file_name = file.name file_name = file_name[:-12] + file_name[-4:] os.rename(old_file_name, file_name) load_recommender(file_name) if question.strip() == '': return '[ERROR]: Question field is empty' if model == "text-davinci-003" or model == "gpt-4" or model == "gpt-4-32k": answer = generate_answer_text_davinci_003(question, openAI_key) else: answer = generate_answer(question, openAI_key, model) chat_history.append([question, answer]) return chat_history except openai.error.InvalidRequestError as e: return f'[ERROR]: Either you do not have access to GPT4 or you have exhausted your quota!' def generate_text_text_davinci_003(openAI_key, prompt, engine="text-davinci-003"): openai.api_key = openAI_key completions = openai.Completion.create( engine=engine, prompt=prompt, max_tokens=512, n=1, stop=None, temperature=0.7, ) message = completions.choices[0].text return message def generate_answer_text_davinci_003(question, openAI_key): topn_chunks = recommender(question) prompt = "" prompt += 'search results:\n\n' for c in topn_chunks: prompt += c + '\n\n' prompt += "Instructions: Compose a comprehensive reply to the query using the search results given. " \ "Cite each reference using [ Page Number] notation (every result has this number at the beginning). " \ "Citation should be done at the end of each sentence. If the search results mention multiple subjects " \ "with the same name, create separate answers for each. Only include information found in the results and " \ "don't add any additional information. Make sure the answer is correct and don't output false content. " \ "If the text does not relate to the query, simply state 'Found Nothing'. Ignore outlier " \ "search results which has nothing to do with the question. Only answer what is asked. The " \ "answer should be short and concise. \n\nQuery: {question}\nAnswer: " prompt += f"Query: {question}\nAnswer:" answer = generate_text_text_davinci_003(openAI_key, prompt, "text-davinci-003") return answer # pre-defined questions questions = [ "What did the study investigate?", "Can you provide a summary of this paper?", "what are the methodologies used in this study?", "what are the data intervals used in this study? Give me the start dates and end dates?", "what are the main limitations of this study?", "what are the main shortcomings of this study?", "what are the main findings of the study?", "what are the main results of the study?", "what are the main contributions of this study?", "what is the conclusion of this paper?", "what are the input features used in this study?", "what is the dependent variable in this study?", ] # ============================================================================= CACHE_TIME = 60 * 60 * 6 # 6 hours def parse_arxiv_id_from_paper_url(url): return url.split("/")[-1] @cached(cache=TTLCache(maxsize=500, ttl=CACHE_TIME)) def get_recommendations_from_semantic_scholar(semantic_scholar_id: str): try: r = requests.post( "https://api.semanticscholar.org/recommendations/v1/papers/", json={ "positivePaperIds": [semantic_scholar_id], }, params={"fields": "externalIds,title,year", "limit": 10}, ) return r.json()["recommendedPapers"] except KeyError as e: raise gr.Error( "Error getting recommendations, if this is a new paper it may not yet have" " been indexed by Semantic Scholar." ) from e def filter_recommendations(recommendations, max_paper_count=5): # include only arxiv papers arxiv_paper = [ r for r in recommendations if r["externalIds"].get("ArXiv", None) is not None ] if len(arxiv_paper) > max_paper_count: arxiv_paper = arxiv_paper[:max_paper_count] return arxiv_paper @cached(cache=TTLCache(maxsize=500, ttl=CACHE_TIME)) def get_paper_title_from_arxiv_id(arxiv_id): try: return requests.get(f"https://huggingface.co/api/papers/{arxiv_id}").json()[ "title" ] except Exception as e: print(f"Error getting paper title for {arxiv_id}: {e}") raise gr.Error("Error getting paper title for {arxiv_id}: {e}") from e def format_recommendation_into_markdown(arxiv_id, recommendations): # title = get_paper_title_from_arxiv_id(arxiv_id) # url = f"https://huggingface.co/papers/{arxiv_id}" # comment = f"Recommended papers for [{title}]({url})\n\n" comment = "The following papers were recommended by the Semantic Scholar API \n\n" for r in recommendations: hub_paper_url = f"https://huggingface.co/papers/{r['externalIds']['ArXiv']}" comment += f"* [{r['title']}]({hub_paper_url}) ({r['year']})\n" return comment def return_recommendations(url): arxiv_id = parse_arxiv_id_from_paper_url(url) recommendations = get_recommendations_from_semantic_scholar(f"ArXiv:{arxiv_id}") filtered_recommendations = filter_recommendations(recommendations) return format_recommendation_into_markdown(arxiv_id, filtered_recommendations) # ============================================================================================== recommender = SemanticSearch() # title = 'PDF GPT Turbo' # description = """ PDF GPT Turbo allows you to chat with your PDF files. It uses Google's Universal Sentence Encoder with Deep averaging network (DAN) to give hallucination free response by improving the embedding quality of OpenAI. It cites the page number in square brackets([Page No.]) and shows where the information is located, adding credibility to the responses.""" # # with gr.Blocks(css="""#chatbot { font-size: 14px; min-height: 1200; }""") as demo: # gr.Markdown(f'
Get your Open AI API key here
') # with gr.Accordion("API Key"): # openAI_key = gr.Textbox(label='Enter your OpenAI API key here', password=True) # url = gr.Textbox(label='Enter PDF URL here (Example: https://arxiv.org/pdf/1706.03762.pdf )') # gr.Markdown("Get your Open AI API key here
') with gr.Accordion("API Key"): openAI_key = gr.Textbox(label='Enter your OpenAI API key here', password=True) url = gr.Textbox(label='Enter PDF URL here (Example: https://arxiv.org/pdf/1706.03762.pdf )') gr.Markdown("