97 lines
2.7 KiB
C++
97 lines
2.7 KiB
C++
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD+Patents license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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// Copyright 2004-present Facebook. All Rights Reserved.
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#pragma once
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#include "GpuIndexIVF.h"
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namespace faiss { struct IndexIVFFlat; }
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namespace faiss { namespace gpu {
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class IVFFlat;
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class GpuIndexFlat;
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struct GpuIndexIVFFlatConfig : public GpuIndexIVFConfig {
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inline GpuIndexIVFFlatConfig()
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: useFloat16IVFStorage(false) {
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}
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/// Whether or not IVFFlat inverted list storage is in float16;
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/// supported on all architectures
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bool useFloat16IVFStorage;
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};
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/// Wrapper around the GPU implementation that looks like
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/// faiss::IndexIVFFlat
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class GpuIndexIVFFlat : public GpuIndexIVF {
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public:
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/// Construct from a pre-existing faiss::IndexIVFFlat instance, copying
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/// data over to the given GPU, if the input index is trained.
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GpuIndexIVFFlat(GpuResources* resources,
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const faiss::IndexIVFFlat* index,
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GpuIndexIVFFlatConfig config = GpuIndexIVFFlatConfig());
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/// Constructs a new instance with an empty flat quantizer; the user
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/// provides the number of lists desired.
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GpuIndexIVFFlat(GpuResources* resources,
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int dims,
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int nlist,
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faiss::MetricType metric,
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GpuIndexIVFFlatConfig config = GpuIndexIVFFlatConfig());
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~GpuIndexIVFFlat() override;
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/// Reserve GPU memory in our inverted lists for this number of vectors
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void reserveMemory(size_t numVecs);
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/// Initialize ourselves from the given CPU index; will overwrite
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/// all data in ourselves
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void copyFrom(const faiss::IndexIVFFlat* index);
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/// Copy ourselves to the given CPU index; will overwrite all data
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/// in the index instance
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void copyTo(faiss::IndexIVFFlat* index) const;
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/// After adding vectors, one can call this to reclaim device memory
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/// to exactly the amount needed. Returns space reclaimed in bytes
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size_t reclaimMemory();
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void reset() override;
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void train(Index::idx_t n, const float* x) override;
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protected:
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/// Called from GpuIndex for add/add_with_ids
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void addImpl_(
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faiss::Index::idx_t n,
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const float* x,
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const faiss::Index::idx_t* ids) override;
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/// Called from GpuIndex for search
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void searchImpl_(
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faiss::Index::idx_t n,
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const float* x,
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faiss::Index::idx_t k,
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float* distances,
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faiss::Index::idx_t* labels) const override;
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private:
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GpuIndexIVFFlatConfig ivfFlatConfig_;
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/// Desired inverted list memory reservation
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size_t reserveMemoryVecs_;
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/// Instance that we own; contains the inverted list
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IVFFlat* index_;
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};
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} } // namespace
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