<class 'wandb.sdk.wandb_config.Config'> object has no attribute 'copy'

I am running a hyperparameter sweep, but the config dict doesn’t seem to have the usual dict attribute ‘copy’. This is a problem because in the xgboost package, xgb.train() requires the parameters to be copied when boosting. I’m unable to train xgboost in a sweep without xgb being able to .copy() the config. Here is a quick demo:

sweep_config = {
    'method': 'random',
    'parameters': {
        'gamma': {
            'values': [0.1, 0.2, 0.3]
        'lambda': { 
            'values': [0.4, 0.5, 0.6, 0.7, 0.8]
        'learning_rate': {
            'values': [0.001, 0.01, 0.05, 0.1]
        'objective': {
            'value': 'multi:softprob',
        'num_class': {
            'value': 3
def train(config=None):
    with wandb.init(
        config = wandb.config
sweep_id = wandb.sweep(sweep_config, project="my_project_name")
wandb.agent(sweep_id, train, count=10)

The error message is:

Traceback (most recent call last):
  File "/path/to/miniconda3/envs/myenv_py311/lib/python3.11/site-packages/wandb/sdk/wandb_config.py", line 162, in __getattr__
    return self.__getitem__(key)
  File "/path/to/miniconda3/envs/myenv_py311/lib/python3.11/site-packages/wandb/sdk/wandb_config.py", line 130, in __getitem__
    return self._items[key]
KeyError: 'copy'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/var/folders/_t/gnglhcjx7bq497x344n42txc0000gq/T/ipykernel_5206/2730897414.py", line 5, in train
  File "/path/to/miniconda3/envs/myenv_py311/lib/python3.11/site-packages/wandb/sdk/wandb_config.py", line 164, in __getattr__
    raise AttributeError(
AttributeError: <class 'wandb.sdk.wandb_config.Config'> object has no attribute 'copy'

hey @ht99 - your observation is correct; we don’t support using .copy() with wandb.config since this is not a standard python dictionary but rather a wandb.sdk.wandb_config.Config object. I recommend changing the config.copy() line to config.as_dict().copy() if you’d like to do dictionary operations on wandb.config going forward

Awesome thanks so much for clarifying, I appreciate it!