lopq_model.proto

 Copyright 2015, Yahoo Inc.
 Licensed under the terms of the Apache License, Version 2.0. See the LICENSE file associated with the project for terms.

 define a namespace for protobuffer
package com.flickr.vision.lopq;

 options for how java class should be built and packaged
option java_package = com.flickr.vision.lopq;
option java_outer_classname = LOPQModelParameters;
option optimize_for = SPEED;



 GENERIC TYPES

message Vector {
    repeated float values = 1 [packed = true];
}

message Matrix {
    repeated float values = 1 [packed = true];
    repeated uint32 shape = 2;
}


  LOPQ PARAMS

 lopq model params
 file extension .lopq
message LOPQModelParams {

    optional uint32 D = 1;                   dimensionality of original vectors
    optional uint32 V = 2;                   number of coarse quantizer centroids
    optional uint32 M = 3;                   number of subvectors
    optional uint32 num_subquantizers = 4;   number of subquantizer clusters

    repeated Matrix Cs = 5;                  coarse quantizer centroids - 2 of these; size V x (D2)
    repeated Matrix Rs = 6;                  rotations - 2  V of these, each size D2 x D2
    repeated Vector mus = 7;                 residual means - 2  V of these, each size D2
    repeated Matrix subs = 8;                subquantizer centroids - M of these, each size num_subquantizers x (D2))
}