pymilvus index params¶

Module Contents¶

This module briefly illustrate parameters of each type of index. You can find detail example in index examples.

Index¶

FLAT/IVF_FLAT¶

Create index param

nlist
- number of inverted file cell list
- Range: [1, 999999]
- recommended value: 16384

Search param

nprobe
- number of inverted file cell to probe
- Range: [1, nlist]
- recommended value: 32

IVF_PQ¶

Create index param

m
- m is decided by dim and have a couple of results. each result represent a kind of compress ratio.
- Range: [96, 64, 56, 48, 40, 32, 28, 24, 20, 16, 12, 8, 4, 3, 2, 1]
- recommended value: 12
nlist
- number of inverted file cell list
- Range: [1, 999999]
- recommended value: 16384

Search param

nprobe
- number of inverted file cell to probe
- Range: [1, nlist]
- recommended value: 32

IVF_SQ8/IVF_SQ8H¶

Create index param

nlist
- number of inverted file cell list
- Range: [1, 999999]
- recommended value: 16384

Search param

nprobe
- number of inverted file cell to probe
- Range: [1, nlist]
- recommended value: 32

HNSW¶

Create index param

M
- number of neighbor in index graph
- Range: [5, 48]
- recommended value: 16
efConstruction
- take effect in stage of index construction. The larger the value is, the more time cost during creatind index and the more accurate search results are.
- Range: [100, 500]
- recommended value: 500

Search param

ef
- max length of candidate results
- Range: [topk, 4096]
- recommended value: 64

NSG¶

Create index param

search_length
- Range: [10, 300]
- recommended value: 45
out_degree
- Range: [5, 300]
- recommended value: 50
candidate_pool_size
- Range: [50, 1000]
- recommended value: 300
knng
- Range: [5, 300]
- recommended value: 100

Search param

search_length
- Range: [10, 300]
- recommended value: 100