Before, using the trainer would result in:

AttributeError: Your LightningModule code tried to access `self.trainer.model` but this attribute is not available when using Fabric with a LightningModule.

Which would occur during validation when 'on_validation_model_eval' and 'on_validation_model_train' were called, as they do not work with fabric. This change allows the model to be switched between train and eval mode (which the original behavior intends) without relying on calling 'self.trainer.model'. A check is added for overridden methods to not change a user's code.

for more information, see https://pre-commit.ci

…al()

Change to not overcomplicate the fix for fabric not working with the default "on_validation_model_eval" and "on_validation_model_train".

for more information, see https://pre-commit.ci