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Distance.cuh
/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD+Patents 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/DeviceTensor.cuh"
#include "../utils/Float16.cuh"
namespace faiss { namespace gpu {
class GpuResources;
/// Calculates brute-force L2 distance between `vectors` and
/// `queries`, returning the k closest results seen
void runL2Distance(GpuResources* resources,
Tensor<float, 2, true>& vectors,
Tensor<float, 2, true>* vectorsTransposed,
// can be optionally pre-computed; nullptr if we
// have to compute it upon the call
Tensor<float, 1, true>* vectorNorms,
Tensor<float, 2, true>& queries,
int k,
Tensor<float, 2, true>& outDistances,
Tensor<int, 2, true>& outIndices,
// Do we care about `outDistances`? If not, we can
// take shortcuts.
bool ignoreOutDistances = false);
/// Calculates brute-force inner product distance between `vectors`
/// and `queries`, returning the k closest results seen
void runIPDistance(GpuResources* resources,
Tensor<float, 2, true>& vectors,
Tensor<float, 2, true>* vectorsTransposed,
Tensor<float, 2, true>& queries,
int k,
Tensor<float, 2, true>& outDistances,
Tensor<int, 2, true>& outIndices);
#ifdef FAISS_USE_FLOAT16
void runIPDistance(GpuResources* resources,
Tensor<half, 2, true>& vectors,
Tensor<half, 2, true>* vectorsTransposed,
Tensor<half, 2, true>& queries,
int k,
Tensor<half, 2, true>& outDistances,
Tensor<int, 2, true>& outIndices,
bool useHgemm);
void runL2Distance(GpuResources* resources,
Tensor<half, 2, true>& vectors,
Tensor<half, 2, true>* vectorsTransposed,
Tensor<half, 1, true>* vectorNorms,
Tensor<half, 2, true>& queries,
int k,
Tensor<half, 2, true>& outDistances,
Tensor<int, 2, true>& outIndices,
bool useHgemm,
bool ignoreOutDistances = false);
#endif
} } // namespace