Gathers the stats from self.trainer.stats and passes them into
            self.log, as a list

def log_state(self, state):
        """ Gathers the stats from self.trainer.stats and passes them into
            self.log, as a list """
        results = []
        for field_idx, field in enumerate(self.fields):
            parent, stat = None, state
            for f in field:
                parent, stat = stat, stat[f]
            results.append(stat)
        self.log(*results)