Reciprocal Rank Fusion (RRF)

Reciprocal Rank Fusion (RRF) module for combining vector and traditional search results in Drupal Search API.

Features

• Implements Reciprocal Rank Fusion algorithm for search result merging
• Seamlessly integrates with Search API
• Combines vector-based and keyword-based search results
• Improves search relevance through result fusion

Requirements

• Drupal 10 or Drupal 11
• Search API module
• AI module (2.0+) with AI Search submodule

Installation

Using Composer (recommended)

composer require drupal/rrf

Then enable the module:

drush en rrf

Manual Installation

1. Download the module from Drupal.org
2. Extract to web/modules/contrib/rrf
3. Enable via the admin interface or with Drush

Usage

Once enabled, the RRF Search module provides a Search API processor that combines results from multiple search backends using the Reciprocal Rank Fusion algorithm.

How RRF Works

Reciprocal Rank Fusion combines rankings from multiple search systems by:

1. Taking results from different search methods (e.g., vector search and keyword search)
2. Assigning scores based on result positions
3. Merging and re-ranking results for optimal relevance

Contributing

Contributions are welcome! Please:

1. Check the issue queue for existing issues
2. Follow Drupal coding standards
3. Submit patches or merge requests via Drupal.org

Support

• Issue tracking: Drupal.org issue queue
• Source code: DrupalCode Git repository

License

This project is licensed under the GPL-2.0-or-later license.