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## IVF_FLAT
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**IVF** (*Inverted File*) is an index type based on quantization. It divides the points in space into `nlist` units by the clustering method. During searching vectors, it compares the distances between the target vector and the center of all the units, and then selects the `nprobe` nearest unit. Afterwards, it compares all the vectors in these selected cells to get the final result.
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**IVF** (*Inverted File*) is an index type based on quantization. It divides the points in space into `nlist` units by the clustering method. During searching vectors, it compares the distance between the target vector and the center of all units, and then selects the `nprobe` nearest unit. Afterwards, it compares all the vectors in these selected cells to get the final result.
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IVF_FLAT is the most basic IVF index, and the encoded data stored in each unit is consistent with the original data.
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