在深度学习中准备训练数据这是一种什么技术？没见过 求解
论文：GeoDesc: Learning Local Descriptors by Integrating Geometry Constraints
”we rely on successful 3D reconstructions to generate ground truth 2D correspondences in an auto-matic manner. First, sparse reconstructions are obtained from standard SfMpipeline [32]. Then, 2D correspondences are generated by projecting 3D point clouds.”
