openmdao 2.2.0：设置时出现类型错误

Question

当运行宁以下示例代码时：

from openmdao.api import Problem, Group, IndepVarComp, ImplicitComponent, ScipyOptimizeDriver


class Test1Comp(ImplicitComponent):

    def setup(self):
        self.add_input('x', 0.5)
        self.add_input('design_x', 1.0)
        self.add_output('z', val=0.0)
        self.add_output('obj')

        self.declare_partials(of='*', wrt='*', method='fd', form='central', step=1.0e-4)

    def apply_nonlinear(self, inputs, outputs, resids):
        x = inputs['x']
        design_x = inputs['design_x']
        z = outputs['z']

        resids['z'] = x*z + z - 4
        resids['obj'] = (z/5.833333 - design_x)**2


if __name__ == "__main__":

    prob = Problem()
    model = prob.model = Group()

    model.add_subsystem('p1', IndepVarComp('x', 0.5))
    model.add_subsystem('d1', IndepVarComp('design_x', 1.0))
    model.add_subsystem('comp', Test1Comp())

    model.connect('p1.x', 'comp.x')
    model.connect('d1.design_x', 'comp.design_x')

    prob.driver = ScipyOptimizeDriver()
    prob.driver.options["optimizer"] = 'SLSQP'
    model.add_design_var("d1.design_x", lower=0.5, upper=1.5)
    model.add_objective('comp.obj')

    prob.setup()
    prob.run_model()
    print(prob['comp.z'])

我得到：

Traceback (most recent call last):
  File "C:/Users/jonat/Desktop/mockup_component3.py", line 40, in <module>
    prob.setup()
  File "C:\Python\openmdao\core\problem.py", line 409, in setup
    model._setup(comm, 'full', mode)
  File "C:\Python\openmdao\core\system.py", line 710, in _setup
    self._setup_relevance(mode, self._relevant)
  File "C:\Python\openmdao\core\system.py", line 1067, in _setup_relevance
    self._relevant = relevant = self._init_relevance(mode)
  File "C:\Python\openmdao\core\group.py", line 693, in _init_relevance
    return get_relevant_vars(self._conn_global_abs_in2out, desvars, responses, mode)
  File "C:\Python\openmdao\core\group.py", line 1823, in get_relevant_vars
    if 'type_' in nodes[node]:
TypeError: 'instancemethod' object has no attribute '__getitem__'

谁能解释一下为什么？我已经成功运行一个类似的组件，但没有优化，所以我怀疑错误来自优化结构。例如，我是否必须在 ExplicitComponent 中定义 objective？

Answer 1

当我运行:

时，我收到了更具描述性的消息

KeyError: 'Variable name "comp.y" not found.'

这只是意味着组件 "comp" 没有名为 "y"（或 "z"）的变量。

Answer 2

问题似乎是OpenMDAO安装不正确造成的。我之前曾尝试通过下载包含 OpenMDAO 的 zip-file 来安装。现在我改为使用 pip 安装，错误消失了。

openmdao 2.2.0：设置时出现类型错误

openmdao 2.2.0: TypeError at setup

openmdao