[Graphbolt] Update walkthrough Tutorial. (#6450)

notebooks/graphbolt/walkthrough.ipynb

@@ -9,7 +9,7 @@
       ],
       "gpuType": "T4",
       "private_outputs": true,
-      "authorship_tag": "ABX9TyPvfttw1smlh4C4S7WfGkTB"
+      "authorship_tag": "ABX9TyOCdFtYQweXnIR1/5oWDSGq"
     },
     "kernelspec": {
       "name": "python3",
@@ -48,7 +48,10 @@
         "os.environ['TORCH'] = torch.__version__\n",
         "os.environ['DGLBACKEND'] = \"pytorch\"\n",
         "\n",
-        "!pip install --pre dgl -f https://data.dgl.ai/wheels-test/cu118/repo.html > /dev/null\n",
+        "# Uncomment below to install required packages. If the CUDA version is not 11.8,\n",
+        "# check the https://www.dgl.ai/pages/start.html to find the supported CUDA\n",
+        "# version and corresponding command to install DGL.\n",
+        "# !pip install --pre dgl -f https://data.dgl.ai/wheels-test/cu118/repo.html > /dev/null\n",
         "\n",
         "try:\n",
         "    import dgl.graphbolt as gb\n",
@@ -81,7 +84,7 @@
         "     [4, 9], [4, 9], [5, 9], [9, 9], [5, 9], [9, 9], [7, 9]]\n",
         ")\n",
         "item_set = gb.ItemSet(node_pairs, names=\"node_pairs\")\n",
-        "print(item_set)"
+        "print(list(item_set))"
       ],
       "metadata": {
         "id": "g73ZAbMQsSgV"