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import streamlit as st |
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from langchain.llms import HuggingFaceHub |
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import os |
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from PyPDF2 import PdfReader |
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from langchain.text_splitter import RecursiveCharacterTextSplitter |
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from langchain.embeddings import HuggingFaceEmbeddings |
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from langchain.vectorstores import FAISS |
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from langchain.chat_models import ChatOpenAI |
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from langchain.chains.question_answering import load_qa_chain |
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st.set_page_config('preguntaDOC') |
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st.header("Pregunta a tu PDF") |
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OPENAI_API_KEY = st.text_input('OpenAI API Key', type='password') |
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pdf_obj = st.file_uploader("Carga tu documento", type="pdf", on_change=st.cache_resource.clear) |
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@st.cache_resource |
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def create_embeddings(pdf): |
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pdf_reader = PdfReader(pdf) |
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text = "" |
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for page in pdf_reader.pages: |
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text += page.extract_text() |
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text_splitter = RecursiveCharacterTextSplitter( |
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chunk_size=800, |
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chunk_overlap=100, |
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length_function=len |
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) |
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chunks = text_splitter.split_text(text) |
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embeddings = HuggingFaceEmbeddings(model_name="sentence-transformers/paraphrase-multilingual-mpnet-base-v2") |
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knowledge_base = FAISS.from_texts(chunks, embeddings) |
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return knowledge_base |
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if pdf_obj: |
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knowledge_base = create_embeddings(pdf_obj) |
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user_question = st.text_input("Haz una pregunta sobre tu PDF:") |
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if user_question: |
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os.environ["OPENAI_API_KEY"] = OPENAI_API_KEY |
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docs = knowledge_base.similarity_search(user_question, 3) |
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llm = HuggingFaceHub(repo_id="lmsys/vicuna-7b-v1.1", model_kwargs={"temperature":0.5, "max_length":512}) |
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chain = load_qa_chain(llm, chain_type="stuff") |
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respuesta = chain.run(input_documents=docs, question=user_question) |
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st.write(respuesta) |
