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Neural Search Comes to Apache Solr: Approximate Nearest Neighbor, BERT & more

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Neural Search Comes to Apache Solr: Approximate Nearest Neighbor, BERT & more
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The first integrations of machine learning techniques with search allowed to improve the ranking of your search results (Learning To Rank) - but one limitation has always been that documents had to contain the keywords that the user typed in the search box in order to be retrieved. For example, the query “tiger” won’t retrieve documents containing only the terms “panthera tigris”. This is called the vocabulary mismatch problem and over the years it has been mitigated through query and document expansion approaches. Neural search is an Artificial Intelligence technique that allows a search engine to reach those documents that are semantically similar to the user’s query without necessarily containing those terms; it avoids the need for long lists of synonyms by automatically learning the similarity of terms and sentences in your collection through the utilisation of deep neural networks and numerical vector representation. This talk explores the first Apache Solr official contribution about this topic, available from Apache Solr 9.0. During the talk we will give an overview of neural search (Don’t worry - we will keep it simple!): we will describe vector representations for queries and documents, and how Approximate K-Nearest Neighbor (KNN) vector search works. We will show how neural search can be used along with deep learning techniques (e.g, BERT) or directly on vector data, and how we implemented this feature in Apache Solr, giving usage examples! Join us as we explore this new exciting Apache Solr feature and learn how you can leverage it to improve your search experience!