Bfgs config error: Key 'max_iters' not in 'OptimizerConf'

[zhangzhenthu]

Hi, I am using the BFGS optimizer. The following is the config:
defaults :

• modulus_default
• scheduler: tf_exponential_lr
• loss: sum
• self
• optimizer: bfgs
  optimizer:
  max_iter: 1000

Run the case and get the error:

In ‘config’: ConfigKeyError raised while composing config:
Key ‘max_iter’ not in ‘OptimizerConf’
full_key: optimizer.max_iters
reference_type=OptimizerConf
object_type=OptimizerConf

But when I delete max_iter in the config, run the bfgs. In the outputs/casename/.hydra/config.yaml there is a line of “max_iter: 1000”.
Could anyone help me with that? Thanks!

[ngeneva]

Hi @zhangzhenthu

This is unusual since max_iter is in the hydra config settings.

Its hard to tell what your yaml looks like with the bulleted list. Can you make sure the optimizer is set prior to the “self” in the defaults list? See an example of what should work here:

L-BFGS and AdaHessian Optimizers

HI @udemirezen Thanks for your interest in Modulus. Responses to your questions are sectioned below: How can I use l-bfgs optimizer? I can not find any example. I want to use it just by itself. and also, I want to use it after an optimization period by using adam optimizer then l-bfgs optimizer. Several papers used this approach. how can I use Adahessian optimizer. Agai I can not find any example. Switching between optimizers should be as simple as changing the your config.yaml file. There’…

[zhangzhenthu]

Hi!
As you said, I put the self prior to the optimizer in the defaults list. It fixed my problem.

Thank you!