Semantic Ranking In Azure AI Search
Introduction
Imagine you are employed
by a company creating an app aimed at local tourists. You possess a vast amount
of data regarding local attractions, yet when users look for information, they
occasionally do not see the most pertinent articles at the forefront of their
search results. In order to enhance the user experience of your app, you have
to explore methods to provide users with more relevant results through the use
of Azure AI Search.
What is Semantic Ranking?
Semantic ranking is a
feature in Azure AI Search designed to enhance the order of search results. It
leverages language understanding to more effectively align the context of the
user's original query with the ranking of the search results.
BM25 Ranking Function
Azure AI Search, by
default, utilizes the BM25 ranking function. The BM25 ranking function
evaluates search results based on how often the search term is found in a
document. Typically, the BM25 ranking function produces high-quality rankings,
as documents that contain a search term frequently are often the most pertinent.
However, this is not always the case. The BM25 ranking method does not consider
the semantics of the query, and sometimes enhancing ranking can be achieved
through the inclusion of language understanding.
Semantic Ranking
Semantic ranking serves
two purposes, it enhances the response to the question by including captions
and responses in the results, and it enhances the ranking of the query results
based on language comprehension.
In order to extract the
context and meaning of the query, semantic ranking combines language
understanding models with the BM25 ranking to compute a new relevance score.
Semantic Captions and Answers
In addition to the
ranking search results, semantic captions and replies offer extra results that
you can show to help visitors better comprehend the results. Semantic captions
highlight the most pertinent material in summary phrases that are taken
straight from the document.
Semantic answers is an
optional additional feature of semantic ranking that provides answers to
questions. If the search query appears to be a question and the search results
contains text that appears to be a relevant answer, then the semantic answer is
returned.
Conclusion
We have successfully
learnt about Semantic Ranking in Azure AI search.

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