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app.py
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import streamlit as st
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from llama_index.core import StorageContext, load_index_from_storage, VectorStoreIndex, SimpleDirectoryReader, ChatPromptTemplate
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from llama_index.llms.huggingface import HuggingFaceInferenceAPI
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from dotenv import load_dotenv
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from llama_index.embeddings.huggingface import HuggingFaceEmbedding
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from llama_index.core import Settings
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import os
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import base64
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import docx2txt
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# Load environment variables
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load_dotenv()
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icons = {"assistant": "robot.png", "user": "man-kddi.png"}
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# Configure the Llama index settings
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Settings.llm = HuggingFaceInferenceAPI(
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model_name="meta-llama/Meta-Llama-3-8B-Instruct",
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tokenizer_name="meta-llama/Meta-Llama-3-8B-Instruct",
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context_window=3900,
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token=os.getenv("HF_TOKEN"),
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max_new_tokens=1000,
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generate_kwargs={"temperature": 0.5},
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)
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Settings.embed_model = HuggingFaceEmbedding(
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model_name="BAAI/bge-small-en-v1.5"
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)
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# Define the directory for persistent storage and data
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PERSIST_DIR = "./db"
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DATA_DIR = "data"
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# Ensure data directory exists
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os.makedirs(DATA_DIR, exist_ok=True)
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os.makedirs(PERSIST_DIR, exist_ok=True)
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def displayPDF(file):
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with open(file, "rb") as f:
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base64_pdf = base64.b64encode(f.read()).decode('utf-8')
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pdf_display = f'<iframe src="data:application/pdf;base64,{base64_pdf}" width="100%" height="600" type="application/pdf"></iframe>'
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st.markdown(pdf_display, unsafe_allow_html=True)
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def displayDOCX(file):
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text = docx2txt.process(file)
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st.text_area("Document Content", text, height=400)
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def displayTXT(file):
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with open(file, "r") as f:
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text = f.read()
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st.text_area("Document Content", text, height=400)
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def data_ingestion():
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documents = SimpleDirectoryReader(DATA_DIR).load_data()
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storage_context = StorageContext.from_defaults()
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index = VectorStoreIndex.from_documents(documents)
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index.storage_context.persist(persist_dir=PERSIST_DIR)
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def handle_query(query):
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storage_context = StorageContext.from_defaults(persist_dir=PERSIST_DIR)
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index = load_index_from_storage(storage_context)
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chat_text_qa_msgs = [
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(
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"user",
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"""You are Q&A assistant named CHAT-DOC. Your main goal is to provide answers as accurately as possible, based on the instructions and context you have been given. If a question does not match the provided context or is outside the scope of the document, kindly advise the user to ask questions within the context of the document.
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Context:
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{context_str}
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Question:
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{query_str}
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"""
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)
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]
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text_qa_template = ChatPromptTemplate.from_messages(chat_text_qa_msgs)
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query_engine = index.as_query_engine(text_qa_template=text_qa_template)
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answer = query_engine.query(query)
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if hasattr(answer, 'response'):
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return answer.response
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elif isinstance(answer, dict) and 'response' in answer:
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return answer['response']
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else:
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return "Sorry, I couldn't find an answer."
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# Streamlit app initialization
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st.title("Chat with your Document 📄")
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st.markdown("Chat here👇")
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if 'messages' not in st.session_state:
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st.session_state.messages = [{'role': 'assistant', "content": 'Hello! Upload a PDF, DOCX, or TXT file and ask me anything about its content.'}]
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for message in st.session_state.messages:
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with st.chat_message(message['role'], avatar=icons[message['role']]):
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st.write(message['content'])
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with st.sidebar:
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st.title("Menu:")
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uploaded_file = st.file_uploader("Upload your document (PDF, DOCX, TXT)", type=["pdf", "docx", "txt"])
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if st.button("Submit & Process") and uploaded_file:
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with st.spinner("Processing..."):
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file_extension = os.path.splitext(uploaded_file.name)[1].lower()
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filepath = os.path.join(DATA_DIR, "uploaded_file" + file_extension)
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with open(filepath, "wb") as f:
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f.write(uploaded_file.getbuffer())
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if file_extension == ".pdf":
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displayPDF(filepath)
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elif file_extension == ".docx":
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displayDOCX(filepath)
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elif file_extension == ".txt":
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displayTXT(filepath)
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data_ingestion() # Process file every time a new file is uploaded
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st.success("Done")
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user_prompt = st.chat_input("Ask me anything about the content of the document:")
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if user_prompt and uploaded_file:
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st.session_state.messages.append({'role': 'user', "content": user_prompt})
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with st.chat_message("user", avatar=icons["user"]):
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st.write(user_prompt)
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# Trigger assistant's response retrieval and update UI
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with st.spinner("Thinking..."):
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response = handle_query(user_prompt)
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with st.chat_message("assistant", avatar=icons["assistant"]):
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st.write(response)
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st.session_state.messages.append({'role': 'assistant', "content": response})
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