Some road type classifications are influenced by city size, traffic density, and regional conventions. For example, in a very large city a primary street may have three or more lanes in each direction on a divided road. While in a town of dirt roads, the only paved single lane street could be a primary street.
subset - a set whose members are members of another set; a set contained within another set. set - (mathematics) an abstract collection of numbers or symbols; the set of prime numbers is infinite. Translations. podmnoÅ¾ina.
In this method, the mostly large dataset is randomly divided to three subsets: 1  Training set is a subset of the dataset used to build predictive models. 2  Validation set is a subset of the dataset used to assess the performance of model built in the training phase.