Tutorial2: moved functs from utils.py to notebook

Author: GabrieleSantin

Tutorial2/Tutorial2.ipynb

@@ -310,6 +310,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "import torch.nn as nn\n",
+    "import torch\n",
+    "\n",
     "#%% Linear layer\n",
     "class LinearModel(nn.Module):\n",
     "    def __init__(self, input_dim, output_dim):\n",