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ACORN is an index for state-of-the-art search over vector embeddings and structured data, enabling performant, predicate-agnostic queries as described in its SIGMOD ’24 work. This GitHub project provides a C++ implementation of the ACORN index built on the FAISS library, with examples of initializing and constructing the index. It is released under the MIT license, with installation and usage instructions included in the repository.
AI named ACORN in November 2025.