An Indexer that works out-of-the-box when you have less than 100K stored Documents

Overview

U100KIndexer

An Indexer that works out-of-the-box when you have less than 100K stored Documents. U100K means under 100K. At 100K stored Documents with 768-dim embeddings, you can expect 300ms for single query or 20~120QPS for batch queries. Results are full Documents.

U100KIndexer leverages jina.DocumenetArrayMemmap as the storage backend and .match() to conduct nearest neighbours search. It returns the full Documents as-is, hence no need to concatenate it with another key-value indexer to retrieve Documents.

Pros & cons

Pros

  • Exhaustive search: highest recall
  • Fast indexing
  • Acceptable query performance under 100K
  • Always return full Documents
  • No extra dependencies

Cons

  • Slow query time

Performance

The indexing and query performance on 768-dim embeddings is as follows (unit is second):

Stored data Indexing time Query size=1 Query size=8 Query size=64
10000 0.256 0.019 0.029 0.086
50000 1.156 0.147 0.177 0.314
100000 2.329 0.297 0.332 0.536
200000 4.704 0.656 0.744 1.050
400000 11.105 1.289 1.536 2.793

Benchmark script can be found in benchmark.py.

Tips

To change workspace,

U100KIndexer(metas={'workspace': './my'})

Or .add(..., uses_metas={'workspace': './my'}) when you use it in a Flow.

Owner
Jina AI
A Neural Search Company. We provide the cloud-native neural search solution powered by state-of-the-art AI technology.
Jina AI
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