Fix NotImplementedError

✅ Solution

The "NotImplementedError" in PyTorch Lightning usually arises when a required method (like `training_step`, `configure_optimizers`, or callbacks expecting specific hooks) is not defined in your LightningModule or Callback. Resolve this by ensuring you've overridden all necessary methods in your LightningModule or Callback classes with your custom logic, paying close attention to the expected inputs and outputs for each method as defined in the PyTorch Lightning documentation. If using callbacks, verify existing inherited methods.