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91+ < h1 class ="title is-1 publication-title "> Efficient In-Memory Inverted Indexes: Theory and
92+ Practice</ h1 >
93+ < div class ="is-size-5 publication-authors ">
94+ < span class ="author-block ">
95+ < a href ="https://jmmackenzie.io/ "> Joel Mackenzie</ a > < sup > 1</ sup > ,</ span >
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97+ < a href ="https://macavaney.us/ "> Sean MacAvaney</ a > < sup > 2</ sup > ,</ span >
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99+ < a href ="https://antoniomallia.it "> Antonio Mallia</ a > < sup > 3</ sup > ,
100+ </ span >
101+ < span class ="author-block ">
102+ < a href ="https://siedlaczek.me/ "> Michal Siedlaczek</ a > < sup > 4</ sup > ,
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106+ < div class ="is-size-5 publication-authors ">
107+ < span class ="author-block "> < sup > 1</ sup > The University of Queensland,</ span >
108+ < span class ="author-block "> < sup > 2</ sup > University of Glasgow,</ span >
109+ < span class ="author-block "> < sup > 3</ sup > Pinecone,</ span >
110+ < span class ="author-block "> < sup > 4</ sup > MongoDB, Inc.</ span >
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182+ < h2 class ="title is-3 "> Abstract</ h2 >
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185+ Inverted indexes are the backbone of most large-scale information retrieval systems.
186+ Although conceptually simple, high-performance inverted indexes require a deep understanding
187+ of low-level system optimizations, compression techniques, and traversal strategies. With
188+ the widespread adoption of in-memory search engines, the rise of learned sparse retrieval
189+ (LSR), and the increasing complexity of ranking pipelines, the design space for efficient
190+ indexing and retrieval systems has expanded significantly.
191+ </ p >
192+ < p >
193+ This tutorial addresses a critical knowledge gap between textbook-style explanations and
194+ advanced techniques required for efficient and optimized retrieval. It aims to equip
195+ researchers and practitioners with a comprehensive understanding of how modern in-memory
196+ search systems are designed, built, and optimized for high-performance retrieval across
197+ large-scale document collections.
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