Subsets of Dataset

Opus implements a child class of Dataset, called DatasetSubset, which allows to define a subset of a dataset. Conceptually, it is a viewing window for the parent Dataset object, not a copy. Thus, any change in the parent object is seen by the child.

It is initialized by passing the parent object and an index to the constructor. The index determines indices of elements within the parent object that should be seen. Any call of get_attribute() returns values corresponding to the index.