def get_signature(self, typname, version=None):
        raise NotImplementedError('get_signature')
Ensure docker image exists.
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.main/src/openmdao/main/factory.py/Factory.get_signature--crossover with--dataset/ETHPy150Open chapmanb/bcbio-nextgen-vm/bcbiovm/docker/install.py/_check_docker_image