Update a custom model's default epoch.
This method currently supports a single variable,
defaultEpoch, in its request body, allowing you to change the default epoch for the custom model. By updating the default epoch, you can customize the model's behavior for processing requests without specifying an epoch explicitly. Additionally, changing the default epoch also updates the evalLoss value, ensuring that the evaluation loss reflects the updated epoch configuration, providing you with accurate information on the model's performance.