...
- both radius low bound and radius high bound MUST be set
- range search will return TOPK results with
- for L2IP: low_bound < = distance <= high_bound
- for IPL2 or other metric types: low_bound <= distance < = high_bound
Motivation(required)
Many users request Milvus to realize a "range search" functionality. With this capability, user can
...
If call range search API with unsupported index types or unsupported metric types, knowhere an exception will throw be thrown out exception.
In Knowhere, only one parameter "radius" is passed in via config, and range search will return all un-sorted results with distance "better" than this radius.
- For IP: > radius
- For L2 or other metric types: < radius
...
| metric type | range | similar | not similar |
|---|---|---|---|
| L2 | ([0, inf) | small0 | largeinf |
| IP | [-1, 1] | 1 | -1 |
| jaccard | [0, 1] | 0 | 1 |
| tanimoto | [0, 0.5]inf) | 00.5 | inf |
| hamming | [0, n] | 0 | n |
2. QueryByRange()
...
In Segcore, it uses radius parameters parameter's existence to decide to run range search or search. When "radius_low_bound" and "radius_high_bound" are set, range search is called; otherwise, search is called.
...
How to get more than 16384 range search results ?
With above this solution, user can get maximum 16384 range search results in one call.
...
The result of each iteration will have some duplication with the result of previous iteration, use user need do duplication check and remove them.
...