keras/src/metrics/regression_metrics.py/MeanSquaredLogarithmicError/__init__
class MeanSquaredLogarithmicError:    def __init__(self, name="mean_squared_logarithmic_error", dtype=None):
        super().__init__(mean_squared_logarithmic_error, name, dtype=dtype)
        # Metric should be minimized during optimization.
        self._direction = "down"