import packages

# Basics
import os
import pandas as pd
import matplotlib.pyplot as plt
from dotenv import load_dotenv

# LangChain Training
# LLM
from langchain.llms import OpenAI

# Document Loader
from langchain.document_loaders import PyPDFLoader 

# Splitter
from langchain.text_splitter import RecursiveCharacterTextSplitter 

# Tokenizer
from transformers import GPT2TokenizerFast  

# Embedding
from langchain.embeddings import OpenAIEmbeddings 

# Vector DataBase
from langchain.vectorstores import FAISS, Pinecone # for the vector database part -- FAISS is local and temporal, Pinecone is cloud-based and permanent. 

# Chains
#from langchain.chains.question_answering import load_qa_chain
#from langchain.chains import ConversationalRetrievalChain