sphinx-searchHow to use custom ranker in SphinxSearch?

Using custom ranker in SphinxSearch is a powerful way to customize the relevance of search results.

To use custom ranker, you need to define a custom ranker function in your Sphinx configuration file.

ranker = custom
custom_ranker = expr:sum(lcs*user_weight1 + bm25*user_weight2)

The above code defines a custom ranker function that combines two ranking algorithms, Longest Common Subsequence (LCS) and BM25. The user_weight1 and user_weight2 parameters can be adjusted to customize the relevance of the search results.

The parts of the code are:

• ranker = custom: This line tells Sphinx to use a custom ranker.
• custom_ranker = expr:sum(lcs*user_weight1 + bm25*user_weight2): This line defines the custom ranker function. The lcs and bm25 parameters are ranking algorithms, and the user_weight1 and user_weight2 parameters can be adjusted to customize the relevance of the search results.

Helpful links

• Sphinx Documentation - Custom Ranking

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