trigger workflow tutorials

tutorials/tutorial9/tutorial.ipynb

@@ -20,7 +20,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 14,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -35,11 +35,11 @@
     "    !pip install \"pina-mathlab\"\n",
     "\n",
     "import torch\n",
-    "import matplotlib.pyplot as plt\n",
+    "import matplotlib.pyplot as plt \n",
     "import warnings\n",
     "\n",
     "from pina import Condition, Trainer\n",
-    "from pina.problem import SpatialProblem\n",
+    "from pina.problem import SpatialProblem \n",
     "from pina.operator import laplacian\n",
     "from pina.model import FeedForward\n",
     "from pina.model.block import PeriodicBoundaryEmbedding  # The PBC module\n",