def search_feature_sets(self, dataset_id):
        """
        Returns an iterator over the FeatureSets fulfilling the specified
        conditions from the specified Dataset.

        :param str dataset_id: The ID of the
            :class:`ga4gh.protocol.Dataset` of interest.
        :return: An iterator over the :class:`ga4gh.protocol.FeatureSet`
            objects defined by the query parameters.
        """
        request = protocol.SearchFeatureSetsRequest()
        request.dataset_id = dataset_id
        request.page_size = pb.int(self._page_size)
        return self._run_search_request(
            request, "featuresets", protocol.SearchFeatureSetsResponse)
Returns an iterator over the FeatureSets fulfilling the specified
        conditions from the specified Dataset.

        :param str dataset_id: The ID of the
            :class:`ga4gh.protocol.Dataset` of interest.
        :return: An iterator over the :class:`ga4gh.protocol.FeatureSet`
            objects defined by the query parameters.