'Deserializes the given data and returns the parsed block_structure.'

def _deserialize(self, serialized_data, root_block_usage_key):

    (block_relations, transformer_data, block_data_map) = zunpickle(serialized_data)
    return BlockStructureFactory.create_new(root_block_usage_key, block_relations, transformer_data, block_data_map)
