一、总体总揽        faiss提供了许多类型的近邻搜索算法实现，如下：一级分类二级分类特点IndexBinaryIndexBinaryFlatBinary指以汉明距离作为度量IndexBinaryFromFloatIndexBinaryHashIndexBinaryHNSWIndexBinaryIVFIndexIndexFlatCodes暴搜的基类MultiIndexQuantizer作为量化器存在AdditiveCoarseQuantizer作为量化器存在ResidualCoarseQuantizer作为量化器存在LocalSearchCoarseQuantizer作为量化器存在In