Added a few metrics for measuring performance

spatz/metrics/max_dev.py

@@ -0,0 +1,20 @@
+from numpy.typing import ArrayLike
+from spatz.metrics import Metric
+
+
+class MaxAbsDeviation(Metric):
+    def __init__(self) -> None:
+        """A metric tracking the maximum absolute deviation from the true value."""
+        super().__init__()
+
+    def _update(self, x: ArrayLike, y: ArrayLike):
+        self._score = max(self._score, abs(x - y))
+
+
+class MaxRelDeviation(Metric):
+    def __init__(self) -> None:
+        """A metric tracking the maximum deviation from the true value in percent."""
+        super().__init__()
+
+    def _update(self, x: ArrayLike, y: ArrayLike):
+        self._score = max(self._score, (x - y) / y)