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Call out some issues with faiss hnsw pq 

Signed-off-by: John Mazanec <jmazane@amazon.com>
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John Mazanec 2021-11-18 11:11:19 -08:00
parent 066efc1e15
commit 4646820ee6
1 changed files with 4 additions and 2 deletions
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_search-plugins/knn/knn-index.md
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@ -89,9 +89,11 @@ Paramater Name | Required | Default | Updatable | Description
Method Name | Requires Training? | Supported Spaces | Description
:--- | :--- | :--- | :---
`hnsw` | false | "l2", "innerproduct" | Hierarchical proximity graph approach to Approximate k-NN search.
`hnsw` | false | "l2", "innerproduct"* | Hierarchical proximity graph approach to Approximate k-NN search.
`ivf` | true | "l2", "innerproduct" | Bucketing approach where vectors are assigned different buckets based on clustering and, during search, only a subset of the buckets are searched.
**Note** --- For *hnsw*, "innerproduct" is not available when PQ is used.
#### HNSW Parameters
Paramater Name | Required | Default | Updatable | Description
@ -150,7 +152,7 @@ Encoder Name | Requires Training? | Description
Paramater Name | Required | Default | Updatable | Description
:--- | :--- | :--- | :--- | :---
`m` | false | 1 | false | Determine how many many sub-vectors to break the vector into. sub-vectors are encoded independently of each other. This dimension of the vector must be divisible by `m`. Max value is 1024.
`code_size` | false | 8 | false | Determines the number of bits to encode a sub-vector into. Max value is 128. **Note** --- for IVF, this value must be less than or equal to 8.
`code_size` | false | 8 | false | Determines the number of bits to encode a sub-vector into. Max value is 8. **Note** --- for IVF, this value must be less than or equal to 8. For HNSW, this value can only be 8.
### Choosing the right method