Build BM25 index from documents and save to output directory

Enhance BM25 index creation and retrieval functionality; save index to output directory

Revert "Refactor retrieve function and enhance UI with Gradio components for improved query handling"

Refactor retrieve function and enhance UI with Gradio components for improved query handling

Add numpy import to app.py for enhanced functionality

Refactor app.py: reorganize imports, remove unused code, and enhance readability

Refactor app.py for improved readability and organization; rearranged imports, added spacing, and formatted code blocks.

Extract jupyter notebook and nlp4web-codebase contents to hf shitspace repo

Create app.py