Add exceptoin

mnist/mnist_gcp.ipynb

@@ -18,6 +18,15 @@
     " "
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "raise ValueError(\"Fake exception\")"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -1783,7 +1792,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.9"
+   "version": "3.7.5rc1"
   }
  },
  "nbformat": 4,