When validation set is disabled metrics callbacks are not returned

[EnricoTrizio]

If the validation set is disabled the metrics are not returned anymore

Metrics are updated at the end of the validation epoch, as implemented in mlcolvar.utils.trainer.MetricsCallback

class MetricsCallback(Callback):

Lightning callback which saves logged metrics into a dictionary.
The metrics are recorded at the end of each validation epoch.

   def __init__(self):
        super().__init__()
        self.metrics = {"epoch": []}

    def on_validation_epoch_end(self, trainer, pl_module):
        metrics = trainer.callback_metrics
        if not trainer.sanity_checking:
            self.metrics["epoch"].append(trainer.current_epoch)
            for key, val in metrics.items():
                val = val.item()
                if key in self.metrics:
                    self.metrics[key].append(val)
                else:
                    self.metrics[key] = [val]

[luigibonati]

I thought this was already fixed this in this commit: https://github.com/luigibonati/mlcolvar/pull/88/commits/2a43254d617d3f0c3c1285d733e2cc39a8a7f3a3

coming from this PR: https://github.com/luigibonati/mlcolvar/pull/88

[EnricoTrizio]

My fault, sorry