export tutorials changed in dd88513 (#559)

Co-authored-by: dario-coscia <dario-coscia@users.noreply.github.com>

tutorials/tutorial19/tutorial.ipynb

@@ -26,12 +26,13 @@
    "source": [
     "## routine needed to run the notebook on Google Colab\n",
     "try:\n",
-    "  import google.colab\n",
-    "  IN_COLAB = True\n",
+    "    import google.colab\n",
+    "\n",
+    "    IN_COLAB = True\n",
     "except:\n",
-    "  IN_COLAB = False\n",
+    "    IN_COLAB = False\n",
     "if IN_COLAB:\n",
-    "  !pip install \"pina-mathlab[tutorial]\"\n",
+    "    !pip install \"pina-mathlab[tutorial]\"\n",
     "\n",
     "import warnings\n",
     "import torch\n",
@@ -229,7 +230,7 @@
     }
    ],
    "source": [
-    "print(f'{tensor.labels=}')\n",
+    "print(f\"{tensor.labels=}\")\n",
     "print(f\"{tensor.full_labels=}\")"
    ]
   },
@@ -329,7 +330,7 @@
     ")\n",
     "\n",
     "print(f'Extract labels: {label_tensor.extract({\"points\" : [0, 2]})=}')\n",
-    "print(f'Similar to: {label_tensor[slice(0, 4, 2), :]=}')"
+    "print(f\"Similar to: {label_tensor[slice(0, 4, 2), :]=}\")"
    ]
   },
   {
@@ -504,8 +505,9 @@
    ],
    "source": [
     "# Node features: [2 nodes, 3 features]\n",
-    "x = LabelTensor(torch.tensor([[1, 2, 3], [4, 5, 6]], dtype=torch.float),\n",
-    "                [\"a\", \"b\", \"c\"])\n",
+    "x = LabelTensor(\n",
+    "    torch.tensor([[1, 2, 3], [4, 5, 6]], dtype=torch.float), [\"a\", \"b\", \"c\"]\n",
+    ")\n",
     "\n",
     "# Edge indices: representing a graph with two edges (node 0 to node 1, node 1 to node 0)\n",
     "edge_index = torch.tensor([[0, 1], [1, 0]], dtype=torch.long)\n",