add tags

Author: keewis

intermediate/hierarchical_computation.ipynb

@@ -144,7 +144,11 @@
    "cell_type": "code",
    "execution_count": null,
    "id": "12",
-   "metadata": {},
+   "metadata": {
+    "tags": [
+     "raises-exception"
+    ]
+   },
    "outputs": [],
    "source": [
     "np.log(tree)"
@@ -199,7 +203,11 @@
    "cell_type": "code",
    "execution_count": null,
    "id": "18",
-   "metadata": {},
+   "metadata": {
+    "tags": [
+     "raises-exception"
+    ]
+   },
    "outputs": [],
    "source": [
     "tree.map_over_datasets(demean)"