Update ece.py

ece.py

@@ -45,7 +45,7 @@ Examples:
     ...                          [0.55, 0.05, 0.40],
     ...                          [0.10, 0.30, 0.60],
     ...                          [0.90, 0.05, 0.05]]),
-    ...     predictions=np.array(),
+    ...     predictions=np.array([0, 1, 2, 0]),
     ...     num_classes=3,
     ...     n_bins=3,
     ...     norm="l1",