lance-format / lance-format/lance
Support PQ code that is larger than 8 bits.
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Description
Problem Statement
Support 9-16 bits (<2B) PQ code.
Performance-wise does larger PQ codes improve performance? How does it compare with just using more subvectors? FAISS seem to be using smaller codes like 4-bits to enable better compression.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reviewing the existing product-quantization implementation and how it represents code widths. Determine what is required to support 9–16-bit PQ codes, then compare their performance with smaller codes and additional subvectors; done means the larger widths are supported and the trade-offs are documented.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- machine-learning, performance
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100