MAINT add file I forgot to upload

smac/configspace/util.py

@@ -0,0 +1,12 @@
+from typing import List
+
+import numpy as np
+
+from smac.configspace import Configuration
+
+
+def impute_inactive_hyperparameters(configs: List[Configuration]) -> np.ndarray:
+    configs_array = np.array([config.get_array() for config in configs],
+                             dtype=np.float64)
+    configs_array[~np.isfinite(configs_array)] = -1
+    return configs_array