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Google recently released a new algorithm to find Approximate Nearest Neighbors called ScaNN. They show through benchmarks that it can perform significantly better than the existing solutions like Annoy, FAISS, hnsw. The goal is to add support for ScaNN algorithm to the list of Milvus supported indexes.
Public Interfaces
Design Details
As part of third party library, we will have to add a new library for ScaNN. This directory here: https://github.com/google-research/google-research/tree/master/scann/scann/scann_ops contains APIs for build/search etc. Also, ScaNN uses Bazel as it's dependency management while we would need to use CMake.
Follwing Follwing public interfaces would be updated in knowhere =>
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namespace IndexParams {
// SCANN params
constexpr const char* num_leaves = "num_leaves";
constexpr const char* num_leaves_to_search = "num_leaves_to_search";
constexpr const char* dimensions_per_block = "dimensions_per_block";
constexpr const char* scoring = "scoring";
constexpr const char* quantize = "quantize";
constexpr const char* reordering_num_neighbors = "reordering_num_neighbors";
} |
Design Details
As part of third party library, we will have to add a new library for ScaNN. This directory here: https://github.com/google-research/google-research/tree/master/scann/scann/scann_ops contains APIs for build/search etc. Also, ScaNN uses Bazel as it's dependency management while we would need to use CMake.
We will create new wrapper classes called IndexScann.h and IndexScann.cpp in knowhere.
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Compatibility, Deprecation, and Migration Plan
N/A as it's a net new index type to be released in newer versions.