code: def search_call_sets(self, variant_set_id, name=None, biosample_id=None):
          
          request = protocol.SearchCallSetsRequest()
          request.variant_set_id = variant_set_id
          request.name = pb.string(name)
          request.biosample_id = pb.string(biosample_id)
          request.page_size = pb.int(self._page_size)
          return self._run_search_request(
              request, "callsets", protocol.SearchCallSetsResponse)
docs: Returns an iterator over the CallSets fulfilling the specified
          conditions from the specified VariantSet.
  
          :param str variant_set_id: Find callsets belonging to the
              provided variant set.
          :param str name: Only CallSets matching the specified name will
              be returned.
          :param str biosample_id: Only CallSets matching this id will
              be returned.
          :return: An iterator over the :class:`ga4gh.protocol.CallSet`
              objects defined by the query parameters.