[CLI]: seep agent fails when running sweeps with 'None' values for sweep parameters

Describe the bug

It looks like recent versions of wandb, definitely wandb==0.12.19, fail when one of the sweep parameters is None.

Note that None values are very common, i.e. for hyperparameters of many models in scikit-learn. For example, this sweep uses None for the value of the max_features hyperparameter in (sklearn.ensemble.GradientBoostingClassifier)[https://scikit-learn.org/stable/modules/generated/sklearn.ensemble.GradientBoostingClassifier.html]

The affected sweeps all work fine with wandb==0.12.15. The workaround for me was to downgrade to that, for now.

Sorry, can’t provide a sweep to reproduce. Create any grid search sweep where one of the hyperparameter values takes a value of ‘None’.

2022-07-29 19:24:15,782 - wandb.wandb_agent - ERROR - Exception while processing command: {'run_id': '<redacted>', 'program': 'scripts/train.py', 'type': 'run', 'args': <...> 'max_features': {'value': None},  

......

Traceback (most recent call last):
  File "/home/<redacted>/python3.6/site-packages/wandb/wandb_agent.py", line 299, in _process_command
    result = self._command_run(command)
  File "/home/<redacted>/python3.6/site-packages/wandb/wandb_agent.py", line 409, in _command_run
    sweep_vars: Dict[str, Any] = Agent._create_command_args(command)
  File "/home/<redacted>/python3.6/site-packages/wandb/wandb_agent.py", line 342, in _create_command_args
    raise ValueError('No "value" found for command["args"]["%s"]' % param)
ValueError: No "value" found for command["args"]["max_features"]

Additional Files

No response

Environment

WandB version: 0.12.19

OS: linux

Python version: 3.6.8

Versions of relevant libraries:

Additional Context

No response

[ramit-wandb]

Thanks! That’s exactly what I needed. I’m going to ticket this out internally right now to be resolved by our engineering team and I will keep you updated on the status of this issue.

Thanks, Ramit

[FabianWesth]

Bump. Please solve this asap as this makes the sweeps quite impractical