DV scale error

[Gittwell]

Hello!
I get an error when I try to add a scale to the design variables for struct (tacs) optimization. I see that the error occurs on the openmdao side. But I don’t understand how I can fix it and what I’m doing wrong. I use OpenMDAO v.3.26.0.

Log of error:

File "/home/mdolabuser/mount/my/my_struct_analys_femap/run.py", line 84, in <module>
    prob.run_driver()
  File "/home/mdolabuser/.pyenv/versions/3.9.16/lib/python3.9/site-packages/openmdao/utils/hooks.py", line 131, in execute_hooks
    ret = f(*args, **kwargs)
  File "/home/mdolabuser/.pyenv/versions/3.9.16/lib/python3.9/site-packages/openmdao/core/problem.py", line 680, in run_driver
    return self.driver.run()
  File "/home/mdolabuser/.pyenv/versions/3.9.16/lib/python3.9/site-packages/openmdao/drivers/scipy_optimizer.py", line 272, in run
    self._check_for_invalid_desvar_values()
  File "/home/mdolabuser/.pyenv/versions/3.9.16/lib/python3.9/site-packages/openmdao/core/driver.py", line 451, in _check_for_invalid_desvar_values
    scaler = meta['scaler'] or 1.
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

My init DV in setup():

        structDVScaling = np.array(struct_builder.fea_assembler.scaleList)
        self.add_design_var(
                    "dv_struct", 
                    lower=lb, 
                    upper=ub, 
                    scaler=structDVScaling,
                )

My print structDVScaling:

[1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000.
 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000.
 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000.
 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000.
 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000.
 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000.
 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000.
 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000.
 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000.
 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000.
 1000. 1000. 1000. 1000. 1000. 1000. 1000. 1000.]

My element_callback():

def element_callback(dvNum, compID, compDescript, elemDescripts, specialDVs, **kwargs):
    # Setup (isotropic) property and constitutive objects
    prop = constitutive.MaterialProperties(rho=rho, E=E, nu=nu, ys=ys)
    # Set one thickness dv for every component
    con = constitutive.IsoShellConstitutive(prop, t=t, tNum=dvNum, tlb=tMin, tub=tMax)

    # For each element type in this component,
    # pass back the appropriate tacs element object
    transform = None
    elemList = []
    for descript in elemDescripts:
        if descript == "CQUAD4":
            # Create a quadrilateral shell element
            elem = elements.Quad4Shell(transform, con)
            elemList.append(elem)
        elif descript == "CTRIA3":
            # Create a triangular shell element
            elem = elements.Tri3Shell(transform, con)
            elemList.append(elem)
        else:
            raise ValueError(f"Unexpected element of type {descript}.")

    print(compDescript, elemDescripts, compID, dvNum, sep='\t')
    scale = [1000.0]

    return elemList, scale

What can I try to fix this error?

[Kenneth-T-Moore]

Thanks for the bug report. This looks like something that may have been fixed sometime between OpenMDAO 3.28 (which is from Aug 2023) and now. In specific, the code in driver.py has been updated to avoid that conditional check on an array. I would update OpenMDAO to the latest and see if that helps get past this error.

[robfalck]

Yep, specifically this commit: OpenMDAO/OpenMDAO@918549e

Any version after 3.30 should resolve this.

[Gittwell]

Thank you! I try update)

[Gittwell]

Yes, it works)) Thank you!