Create semapdf1.4.py

version/semapdf1.4.py

@@ -0,0 +1,169 @@
+"""
+    creator: Lewis Kamau Kimaru
+    Function: chat with pdf documents in different languages
+    best version yet
+"""
+from langchain.text_splitter import CharacterTextSplitter
+from langchain.embeddings import HuggingFaceBgeEmbeddings
+from langchain.vectorstores import FAISS
+from langchain.chat_models import ChatOpenAI
+from langchain.memory import ConversationBufferMemory
+from langchain.chains import ConversationalRetrievalChain
+from langchain.llms import HuggingFaceHub
+
+from typing import Union
+
+from dotenv import load_dotenv
+from PyPDF2 import PdfReader
+import streamlit as st
+import requests
+import json
+import os
+
+# set this key as an environment variable
+os.environ["HUGGINGFACEHUB_API_TOKEN"] = st.secrets['huggingface_token']
+
+# Page configuration
+st.set_page_config(page_title="SemaNaPDF", page_icon="📚",)
+
+# Sema Translator
+Public_Url = 'https://lewiskimaru-helloworld.hf.space' #endpoint
+
+def translate(userinput, target_lang, source_lang=None):
+    if source_lang:
+       url = f"{Public_Url}/translate_enter/"
+       data = {
+           "userinput": userinput,
+           "source_lang": source_lang,
+           "target_lang": target_lang,
+        }
+       response = requests.post(url, json=data)
+       result = response.json()
+       print(type(result))
+       source_lange = source_lang
+       translation = result['translated_text']
+       
+    else:
+      url = f"{Public_Url}/translate_detect/"
+      data = {
+        "userinput": userinput,
+        "target_lang": target_lang,
+      }
+
+      response = requests.post(url, json=data)
+      result = response.json()
+      source_lange = result['source_language']
+      translation = result['translated_text']
+    return source_lange, translation
+
+def get_pdf_text(pdf : Union[str, bytes, bytearray]) -> str:
+    reader = PdfReader(pdf)
+    pdf_text = ''
+    for page in (reader.pages):
+        text = page.extract_text()
+        if text:
+            pdf_text += text
+    return text
+
+
+def get_text_chunks(text:str) ->list:
+    text_splitter = CharacterTextSplitter(
+        separator="\n", chunk_size=1500, chunk_overlap=300, length_function=len
+    )
+    chunks = text_splitter.split_text(text)
+    return chunks
+
+
+def get_vectorstore(text_chunks : list) -> FAISS:
+    model = "sentence-transformers/paraphrase-multilingual-MiniLM-L12-v2"
+    encode_kwargs = {
+        "normalize_embeddings": True
+    }  # set True to compute cosine similarity
+    embeddings = HuggingFaceBgeEmbeddings(
+        model_name=model, encode_kwargs=encode_kwargs, model_kwargs={"device": "cpu"}
+    )
+    vectorstore = FAISS.from_texts(texts=text_chunks, embedding=embeddings)
+    return vectorstore
+
+
+def get_conversation_chain(vectorstore:FAISS) -> ConversationalRetrievalChain:
+    llm = HuggingFaceHub(
+        repo_id="mistralai/Mixtral-8x7B-Instruct-v0.1",
+        #repo_id="TheBloke/Mixtral-8x7B-Instruct-v0.1-GGUF"
+        model_kwargs={"temperature": 0.5, "max_length": 1048},
+    )
+
+    memory = ConversationBufferMemory(memory_key="chat_history", return_messages=True)
+    conversation_chain = ConversationalRetrievalChain.from_llm(
+        llm=llm, retriever=vectorstore.as_retriever(), memory=memory
+    )
+    return conversation_chain
+
+
+st.markdown (""" 
+  <style> div.stSpinner > div {
+    text-align:center; 
+    text-align:center;
+    align-items: center;
+    justify-content: center;
+  } 
+  </style>""", unsafe_allow_html=True)
+
+
+
+def main():
+    st.title("SemaNaPDF📚")
+    # upload file
+    pdf = st.file_uploader("Upload a PDF Document", type="pdf")
+    if pdf is not None:
+        with st.spinner(""):
+            # get pdf text
+            raw_text = get_pdf_text(pdf)
+
+            # get the text chunks
+            text_chunks = get_text_chunks(raw_text)
+
+            # create vector store
+            vectorstore = get_vectorstore(text_chunks)
+
+            # create conversation chain
+            st.session_state.conversation = get_conversation_chain(vectorstore)
+            st.info("done")
+            
+    #user_question = st.text_input("chat with your pdf ...")
+    # show user input
+    if "messages" not in st.session_state:
+        st.session_state.messages = []
+
+    for message in st.session_state.messages:
+        with st.chat_message(message["role"]):
+            st.markdown(message["content"])
+
+    if user_question := st.chat_input("Ask your document anything ......?"):
+        with st.chat_message("user"):
+            st.markdown(user_question)
+            
+        user_langd, Queryd = translate(user_question, 'eng_Latn')
+        st.session_state.messages.append({"role": "user", "content": user_question})
+        response = st.session_state.conversation({"question": Queryd}) #Queryd
+        st.session_state.chat_history = response["chat_history"]
+        
+        output = translate(response['answer'], user_langd, 'eng_Latn')[1] # translated response
+        with st.chat_message("assistant"):
+            #st.markdown(response['answer'])
+            st.markdown(output)
+            st.session_state.messages.append({"role": "assistant", "content": response['answer']})
+
+    # Signature
+    st.markdown(
+        """
+        <div style="position: fixed; bottom: 0; right: 0; padding: 10px;">
+            <a href="https://kamaukimaru.vercel.app" target="_blank" style="font-size: 12px; color: #269129; text-decoration: none;">©2023 Lewis Kimaru. All rights reserved.</a>
+        </div>
+        """,
+        unsafe_allow_html=True
+    )
+
+
+if __name__ == '__main__':
+    main()