use GPU by default

notebooks/test-model.ipynb

@@ -428,7 +428,12 @@
    "toc_position": {},
    "toc_section_display": true,
    "toc_window_display": false
-  }
+  },
+  "colab": {
+    "provenance": []
+  },
+  "accelerator": "GPU",
+  "gpuClass": "standard"
  },
  "nbformat": 4,
  "nbformat_minor": 5