Unverified50% confidenceFactExact time
HyperLogLog is used for cardinality estimation and can estimate the number of unique elements in the billions using only a few KB of memory.
1
Sources
50%
Confidence
Long-term
Relevance
9/19/2026
First Seen
Sources
Related Entities
Related Claims
VerifiedVector databases (such as ChromaDB, Milvus, and Pinecone) use indexing algorithms such as HNSW and IVF to achieve millisecond-level retrieval among millions or even hundreds of millions of vectors.66% similarUnverified向量数据库使用HNSW或IVF等ANN索引结构，可在毫秒级延迟内从数十亿向量中召回语义相关文档63% similarUnverifiedChromaDB底层使用HNSW（分层可导航小世界图）算法构建向量索引，在数十万条向量规模下能保持毫秒级查询响应59% similarUnverifiedChromaDB默认采用HNSW（分层可导航小世界）索引结构，查询复杂度接近O(log n)59% similar
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