Failing to Register Outputs Results in No Components

Here, a subsystem is added as in the previous example, but no outputs are registered in the parent Model.

This "dead code" is ignored when the CSDL compiler back end constructs a computational model.

from csdl_om import Simulatorfrom csdl import Model, NonlinearBlockGSimport csdlimport numpy as np

class ExampleNoRegisteredOutput(Model):
    def define(self):        model = Model()        a = model.declare_variable('a', val=2)        b = model.create_input('b', val=12)        model.register_output('prod', a * b)        self.add(model, name='sys')
        # These expressions are not passed to the compiler back end        x1 = self.declare_variable('x1')        x2 = self.declare_variable('x2')        y1 = x2 + x1        y2 = x2 - x1        y3 = x1 * x2        y5 = x2**2

sim = Simulator(ExampleNoRegisteredOutput())sim.run()
print('prod', sim['prod'].shape)print(sim['prod'])

[24.]