Check Deng 9b1982262a Add ProductAdditiveQuantizer (#2286)
Summary:
This diff added ProductAdditiveQuantizer.

A Simple Algo description:

1. Divide the vector space into several orthogonal sub-spaces, just like PQ does.
2. Quantize each sub-space by an independent additive quantizer.

Usage:

Construct a ProductAdditiveQuantizer object:
- `d`: dimensionality of the input vectors
- `nsplits`: number of sub-spaces divided into
- `Msub`: `M` of each additive quantizer
- `nbits`: `nbits` of each additive quantizer

```python
d = 128
nsplits = 2
Msub = 4
nbits = 8
plsq = faiss.ProductLocalSearchQuantizer(d, nsplits, Msub, nbits)
prq = faiss.ProductResidualQuantizer(d, nsplits, Msub, nbits)
```

Pull Request resolved: https://github.com/facebookresearch/faiss/pull/2286

Test Plan:
```

buck test //faiss/tests/:test_local_search_quantizer -- TestProductLocalSearchQuantizer

buck test //faiss/tests/:test_residual_quantizer -- TestProductResidualQuantizer

```

Reviewed By: alexanderguzhva

Differential Revision: D35907702

Pulled By: mdouze

fbshipit-source-id: 7428a196e6bd323569caa585c57281dd70e547b1
2022-05-05 15:14:07 -07:00
..
2022-04-25 17:55:46 -07:00
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