Merge pull request #75 from MatthewSZhang/all-minus-one

MNT add error that some rows of feat_ids only have -1

Author: MatthewSZhang

fastcan/narx.py

@@ -351,6 +351,11 @@ def _validate_feat_delay_ids(
             "The element x of feat_ids should "
             f"satisfy -1 <= x <= {n_features + n_outputs - 1}."
         )
+    # Check if any row of feat_ids only contains -1
+    if np.all(feat_ids_ == -1, axis=1).any():
+        raise ValueError(
+            "`feat_ids` should not contain rows that only have -1."
+        )
     # Validate delay_ids
     delay_ids_ = check_array(
         delay_ids,