Do I need to provide values for all hyperparameters as part of the W&B Sweep. Can I set defaults?

Access hyperparameter names and values from the sweep configuration using wandb.config, which acts like a dictionary.

For runs outside a sweep, set wandb.config values by passing a dictionary to the config argument in wandb.init. In a sweep, any configuration supplied to wandb.init serves as a default value, which the sweep can override.

Use config.setdefaults for explicit behavior. The following code snippets illustrate both methods:

wandb.init

# Set default values for hyperparameters
config_defaults = {"lr": 0.1, "batch_size": 256}

# Start a run and provide defaults
# that a sweep can override
with wandb.init(config=config_defaults) as run:
    # Add training code here
    ...

config.setdefaults

# Set default values for hyperparameters
config_defaults = {"lr": 0.1, "batch_size": 256}

# Start a run
with wandb.init() as run:
    # Update any values not set by the sweep
    run.config.setdefaults(config_defaults)

    # Add training code here