In one embodiment, a method includes accessing a plurality- of content -objects, generating a plurality of voxelized representations for the plurality.of content objects, respectively, generating one or more building blocks based on one or more sparse convolutions, which includes determining one or mere active sites tor each of the plurality of content objects based on the voxelized representation of each of the plurality of content objects and applying the one or more sparse convolutions to the one or more active sites, and training a machine-learning model based on a convolutional network including the one or more building blocks.
ANALYZING SPATIALLY-SPARSE DATA BASED ON SUBMANIFOLD SPARSE CONVOLUTIONAL NEURAL NETWORKS