1. A computer-implemented method comprising: identifying, by a computing system, a set of regions corresponding to a geographical area; acquiring, by the computing system, a collection of training images, each training image in the collection being associated with one or more respective recognized objects and with a respective region in the set of regions; determining, by the computing system, based at least in part on the collection of training images, histogram metrics for a plurality of object categories within each region in the set of regions; and developing, by the computing system, a neural network based at least in part on the histogram metrics for the plurality of object categories within each region in the set of regions and on the collection of training images.