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PQCodeDistances.cuh
/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the CC-by-NC license found in the
* LICENSE file in the root directory of this source tree.
*/
// Copyright 2004-present Facebook. All Rights Reserved.
#pragma once
#include "../utils/Tensor.cuh"
#include "../utils/NoTypeTensor.cuh"
#include <cublas_v2.h>
namespace faiss { namespace gpu {
class DeviceMemory;
/// pqCentroids is of the form (sub q)(sub dim)(code id)
/// Calculates the distance from the (query - centroid) residual to
/// each sub-code vector, for the given list of query results in
/// topQueryToCentroid
void runPQCodeDistances(Tensor<float, 3, true>& pqCentroids,
Tensor<float, 2, true>& queries,
Tensor<float, 2, true>& coarseCentroids,
Tensor<int, 2, true>& topQueryToCentroid,
NoTypeTensor<4, true>& outCodeDistances,
bool useFloat16Lookup,
cudaStream_t stream);
void runPQCodeDistancesMM(Tensor<float, 3, true>& pqCentroids,
Tensor<float, 2, true>& queries,
Tensor<float, 2, true>& coarseCentroids,
Tensor<int, 2, true>& topQueryToCentroid,
NoTypeTensor<4, true>& outCodeDistances,
bool useFloat16Lookup,
DeviceMemory& mem,
cublasHandle_t handle,
cudaStream_t stream);
} } // namespace