def featureSetsGenerator(self, request):
        """
        Returns a generator over the (featureSet, nextPageToken) pairs
        defined by the specified request.
        """
        dataset = self.getDataRepository().getDataset(request.dataset_id)
        return self._topLevelObjectGenerator(
            request, dataset.getNumFeatureSets(),
            dataset.getFeatureSetByIndex)
Returns a generator over the (featureSet, nextPageToken) pairs
        defined by the specified request.