    def get_grid_metrics(self):
        """Return the metrics that should be displayed in the tracking table.
        """
        return [
            tt.group("train", [
                tt.leaf("epoch"),
                tt.leaf("reco", ".3f"),
             ], align=">"),
            tt.group("valid", [
                tt.leaf("penalty", ".1f"),
                tt.leaf("ms", ".1f"),
                tt.leaf("reco", ".2%"),
                tt.leaf("breco", ".2%"),
                tt.leaf("b_nsdr", ".2f"),
                # tt.leaf("b_nsdr_drums", ".2f"),
                # tt.leaf("b_nsdr_bass", ".2f"),
                # tt.leaf("b_nsdr_other", ".2f"),
                # tt.leaf("b_nsdr_vocals", ".2f"),
             ], align=">"),
            tt.group("test", [
                tt.leaf(name, ".2f")
                for name in self.test_metrics
             ], align=">")
        ]
Return the metrics that should be displayed in the tracking table.
demucs/grids/_explorers.py