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import gradio as gr
import os
import time
from langchain.document_loaders import OnlinePDFLoader
from langchain.text_splitter import CharacterTextSplitter
from langchain.llms import OpenAI
from langchain.embeddings import OpenAIEmbeddings
from langchain.vectorstores import Chroma
from langchain.chains import ConversationalRetrievalChain
# Set OpenAI API key from environment variable
os.environ['OPENAI_API_KEY'] = os.getenv("Your_API_Key")
def loading_pdf():
return "Loading..."
def pdf_changes(pdf_doc):
loader = OnlinePDFLoader(pdf_doc.name)
documents = loader.load()
text_splitter = CharacterTextSplitter(chunk_size=1000, chunk_overlap=0)
texts = text_splitter.split_documents(documents)
embeddings = OpenAIEmbeddings()
db = Chroma.from_documents(texts, embeddings)
retriever = db.as_retriever()
global qa
qa = ConversationalRetrievalChain.from_llm(
llm=OpenAI(temperature=0.5),
retriever=retriever,
return_source_documents=False)
return "Ready"
def add_text(history, text):
history = history + [(text, None)]
return history, ""
def bot(history):
response = infer(history[-1][0], history)
history[-1][1] = ""
for character in response:
history[-1][1] += character
time.sleep(0.05)
yield history
def infer(question, history):
res = []
for human, ai in history[:-1]:
pair = (human, ai)
res.append(pair)
chat_history = res
query = question
result = qa({"question": query, "chat_history": chat_history})
return result["answer"]
css = """
#col-container {max-width: 700px; margin-left: auto; margin-right: auto;}
"""
title = """
<div style="text-align: center;max-width: 700px;">
<h1>Chat with PDF • OpenAI</h1>
<p style="text-align: center;">Upload a .PDF from your computer, click the "Load PDF to LangChain" button, <br />
when everything is ready, you can start asking questions about the pdf ;) <br />
This version is set to store chat history, and uses OpenAI as LLM.</p>
</div>
"""
with gr.Blocks(css=css) as demo:
with gr.Column(elem_id="col-container"):
gr.HTML(title)
with gr.Column():
pdf_doc = gr.File(label="Load a pdf", file_types=['.pdf'], type="file")
with gr.Row():
langchain_status = gr.Textbox(label="Status", placeholder="", interactive=False)
load_pdf = gr.Button("Load pdf to langchain")
chatbot = gr.Chatbot([], elem_id="chatbot").style(height=350)
question = gr.Textbox(label="Question", placeholder="Type your question and hit Enter")
submit_btn = gr.Button("Send Message")
load_pdf.click(loading_pdf, None, langchain_status, queue=False)
load_pdf.click(pdf_changes, inputs=[pdf_doc], outputs=[langchain_status], queue=False)
question.submit(add_text, [chatbot, question], [chatbot, question]).then(
bot, chatbot, chatbot
)
submit_btn.click(add_text, [chatbot, question], [chatbot, question]).then(
bot, chatbot, chatbot
)
demo.launch()
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