PDF_RAG Workflow Demo

This project demonstrates a document retrieval and vectorization workflow based on Haystack, FlagEmbedding, HNSWLib, and BM25.

Directory Structure

• RAG_workflow/parse.py: Parses and splits PDF documents, and generates the content in JSON format.
• RAG_workflow/embedding.py：Vectorizes the document content and produces the embedding vector base.
• RAG_workflow/HNSW_retrieve.py：Performs hybrid retrieval and recall using HNSW and BM25.

Environment Setup

Install dependencies with:

pip install -r requirements.txt

Workflow Steps

1. PDF Parsing

   • Modify PATH_TO_YOUR_PDF_DIRECTORY in parse.py to your PDF folder path.
   • Update the output JSON path（PATH_TO_YOUR_JSON）。
   • Run:

     python PDF-RAG/parse.py

   • The generated JSON file will be used in the next embedding step.

2. JSON Vectorization

   • In embedding.py, update the input JSON path (PATH_TO_YOUR_JSON.json) and the output embedding file path (PATH_TO_YOUR_EMBEDDING.npy).
   • Run:

     python PDF-RAG/embedding.py

3. Retrieval and Recall

   • In HNSW_retrieve.py, update the embedding and JSON paths (PATH_TO_YOUR_JSON.json).
   • Run:

     python PDF-RAG/HNSW_retrieve.py

   • The script will output the construction and retrieval times for both HNSW and BM25, along with the merged retrieval results.
   • Adjust HNSW and BM25 parameters according to the descriptions to get desired results.
   • In hnswlib.Index(), use space='l2' for Squared L2, 'ip' for Inner Product, and 'cosine' for Cosine Similarity.

Dependencies

• numpy
• scikit-learn
• hnswlib
• rank_bm25
• FlagEmbedding
• haystack
• haystack-integrations

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Feel free to open an issue if you encounter any problems!