Error in optimizer main can be obscured by TypeError

[mkeilman]

In local_opt_generator.persistent_local_opt, local_opter.iterate can return an array or a ConvergedMsg. That is handled in the loop, but if something goes wrong right away, the initial step:

        x_new = local_opter.iterate(pass_to_local_opter)
        add_to_local_H(local_H, x_new, user_specs, local_flag=1, on_cube=True)

throws:

[0]  2023-06-09 19:21:57,964 libensemble.manager (ERROR): Message: TypeError: object of type 'ConvergedMsg' has no len()
[0]  2023-06-09 19:21:57,964 libensemble.manager (ERROR): Traceback (most recent call last):
  File "/home/vagrant/.pyenv/versions/3.9.15/envs/py3/lib/python3.9/site-packages/libensemble/worker.py", line 406, in run
    response = self._handle(Work)
  File "/home/vagrant/.pyenv/versions/3.9.15/envs/py3/lib/python3.9/site-packages/libensemble/worker.py", line 355, in _handle
    calc_out, persis_info, calc_status = self._handle_calc(Work, calc_in)
  File "/home/vagrant/.pyenv/versions/3.9.15/envs/py3/lib/python3.9/site-packages/libensemble/worker.py", line 275, in _handle_calc
    out = calc(calc_in, Work)
  File "/home/vagrant/.pyenv/versions/3.9.15/envs/py3/lib/python3.9/site-packages/libensemble/utils/runners.py", line 58, in run_gen
    return result(calc_in, Work["persis_info"], self.gen_specs, Work["libE_info"], self.gen_f, Work["tag"])
  File "/home/vagrant/.pyenv/versions/3.9.15/envs/py3/lib/python3.9/site-packages/libensemble/utils/runners.py", line 91, in _normal_result
    return user_f(*args)
  File "/home/vagrant/src/radiasoft/rsopt/rsopt/libe_tools/generator_functions/local_opt_generator.py", line 37, in persistent_local_opt
    add_to_local_H(local_H, x_new, user_specs, local_flag=1, on_cube=True)
  File "/home/vagrant/src/radiasoft/rsopt/rsopt/libe_tools/generator_functions/local_opt_generator.py", line 93, in add_to_local_H
    assert not local_flag or len(pts) == 1, "Can't > 1 local points"
TypeError: object of type 'ConvergedMsg' has no len()

This may hide the actual error depending on when it took place

[cchall]

@mkeilman do you have an example that shows this error?