How do I fix an `anaconda 400 error` during a sweep?

The following error usually occurs when you do not log the metric that you are optimizing:

wandb: ERROR Error while calling W&B API: anaconda 400 error:
{"code": 400, "message": "TypeError: bad operand type for unary -: 'NoneType'"}

To fix this, make sure you are logging the exact metric specified in your sweep configuration. For example, if your sweep config specifies:

metric:
  name: validation_loss
  goal: minimize

Then your training code must call:

wandb.log({"validation_loss": value})

The metric name must match exactly between your sweep configuration and your wandb.log call. For more information, see Sweeps troubleshooting and Define sweep configuration.

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