Support for IVF_SQ4

[huberl0]

Hi all,

is there any plan to support IVF_SQ4 in a future release? I could not find it on the roadmap.

[yhmo]

So far we don't have any plan for IVF_SQ4.
Could you tell me why you want it? To save more memory?

[huberl0]

Yes exactly, we have a huge collection that is very expensive to store without SQ4.

[xiaofan-luan]

Using IVFPQ could achive similar memory as IVFSQ4.
In latest 2.5, HNSW + PQ will be supported as well.