import os import uuid from langchain_community.document_loaders import PyPDFLoader from langchain_community.embeddings import OpenAIEmbeddings from langchain_community.vectorstores import MongoDBAtlasVectorSearch from langchain_text_splitters import RecursiveCharacterTextSplitter from pymongo import MongoClient PARENT_DOC_ID_KEY = "parent_doc_id" def parent_child_splitter(data, id_key=PARENT_DOC_ID_KEY): parent_splitter = RecursiveCharacterTextSplitter(chunk_size=2000) # This text splitter is used to create the child documents # It should create documents smaller than the parent child_splitter = RecursiveCharacterTextSplitter(chunk_size=400) documents = parent_splitter.split_documents(data) doc_ids = [str(uuid.uuid4()) for _ in documents] docs = [] for i, doc in enumerate(documents): _id = doc_ids[i] sub_docs = child_splitter.split_documents([doc]) for _doc in sub_docs: _doc.metadata[id_key] = _id _doc.metadata["doc_level"] = "child" docs.extend(sub_docs) doc.metadata[id_key] = _id doc.metadata["doc_level"] = "parent" return documents, docs MONGO_URI = os.environ["MONGO_URI"] # Note that if you change this, you also need to change it in `rag_mongo/chain.py` DB_NAME = "langchain-test-2" COLLECTION_NAME = "test" ATLAS_VECTOR_SEARCH_INDEX_NAME = "default" EMBEDDING_FIELD_NAME = "embedding" client = MongoClient(MONGO_URI) db = client[DB_NAME] MONGODB_COLLECTION = db[COLLECTION_NAME] if __name__ == "__main__": # Load docs loader = PyPDFLoader("https://arxiv.org/pdf/2303.08774.pdf") data = loader.load() # Split docs parent_docs, child_docs = parent_child_splitter(data) # Insert the documents in MongoDB Atlas Vector Search _ = MongoDBAtlasVectorSearch.from_documents( documents=parent_docs + child_docs, embedding=OpenAIEmbeddings(disallowed_special=()), collection=MONGODB_COLLECTION, index_name=ATLAS_VECTOR_SEARCH_INDEX_NAME, )