add package versions to the top of the notebook

ch02/01_main-chapter-code/dataloader.ipynb

@@ -18,6 +18,31 @@
     "This notebook contains the main takeaway, the data loading pipeline without the intermediate steps."
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "93804da5-372b-45ff-9ef4-8398ba1dd78e",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "torch version: 2.0.1\n",
+      "tiktoken version: 0.5.1\n"
+     ]
+    }
+   ],
+   "source": [
+    "from importlib.metadata import version\n",
+    "\n",
+    "import tiktoken\n",
+    "import torch\n",
+    "\n",
+    "print(\"torch version:\", version(\"torch\"))\n",
+    "print(\"tiktoken version:\", version(\"tiktoken\"))"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 2,