Add QT_0bit to ScalarQuantizer for centroid-only IVF distance (#5079)#5079
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Add QT_0bit to ScalarQuantizer for centroid-only IVF distance (#5079)#5079mnorris11 wants to merge 1 commit intofacebookresearch:mainfrom
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…okresearch#5079) Summary: Adds a new ScalarQuantizer::QT_0bit type that encodes 0 bits per component, enabling IndexIVFScalarQuantizer to operate in centroid-only distance mode (code_size=0). In this mode, distance_to_code() returns the coarse distance from the quantizer, no per-vector data is stored, and reconstruction returns the centroid vector. This is useful for IVF configurations where only query-to-centroid distances are needed (e.g., Unicorn's SQ0 use case). Changes: - Add QT_0bit enum to ScalarQuantizer::QuantizerType - Add IVFCoarseDistanceScanner that returns coarse_dis from set_list() - Handle code_size=0 in encode/decode/reconstruct/add paths - Add 'SQ0' to index_factory - Force by_residual=false for QT_0bit - Guard memcpy in ArrayInvertedLists for code_size=0 - Handle QT_0bit in index_read.cpp validation switch - Add tests for L2, IP, and index_factory --- Differential Revision: D100348052
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…okresearch#5079) Summary: Adds a new ScalarQuantizer::QT_0bit type that encodes 0 bits per component, enabling IndexIVFScalarQuantizer to operate in centroid-only distance mode (code_size=0). In this mode, distance_to_code() returns the coarse distance from the quantizer, no per-vector data is stored, and reconstruction returns the centroid vector. This is useful for IVF configurations where only query-to-centroid distances are needed (e.g., Unicorn's SQ0 use case). Changes: - Add QT_0bit enum to ScalarQuantizer::QuantizerType - Add IVFCoarseDistanceScanner that returns coarse_dis from set_list() - Handle code_size=0 in encode/decode/reconstruct/add paths - Add 'SQ0' to index_factory - Force by_residual=false for QT_0bit - Guard memcpy in ArrayInvertedLists for code_size=0 - Handle QT_0bit in index_read.cpp validation switch - Add tests for L2, IP, and index_factory --- Differential Revision: D100348052
…okresearch#5079) Summary: Pull Request resolved: facebookresearch#5079 Adds a new ScalarQuantizer::QT_0bit type that encodes 0 bits per component, enabling IndexIVFScalarQuantizer to operate in centroid-only distance mode (code_size=0). In this mode, distance_to_code() returns the coarse distance from the quantizer, no per-vector data is stored, and reconstruction returns the centroid vector. This is useful for IVF configurations where only query-to-centroid distances are needed (e.g., Unicorn's SQ0 use case). Changes: - Add QT_0bit enum to ScalarQuantizer::QuantizerType - Add IVFCoarseDistanceScanner that returns coarse_dis from set_list() - Handle code_size=0 in encode/decode/reconstruct/add paths - Add 'SQ0' to index_factory - Force by_residual=false for QT_0bit - Guard memcpy in ArrayInvertedLists for code_size=0 - Handle QT_0bit in index_read.cpp validation switch - Add tests for L2, IP, and index_factory --- Differential Revision: D100348052
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Summary:
Adds a new ScalarQuantizer::QT_0bit type that encodes 0 bits per component, enabling IndexIVFScalarQuantizer to operate in centroid-only distance mode (code_size=0). In this mode, distance_to_code() returns the coarse distance from the quantizer, no per-vector data is stored, and reconstruction returns the centroid vector.
This is useful for IVF configurations where only query-to-centroid distances are needed (e.g., Unicorn's SQ0 use case).
Changes:
Differential Revision: D100348052