add imports and version on top

ch04/01_main-chapter-code/ch04.ipynb

@@ -8,6 +8,34 @@
     "# Chapter 4: Implementing a GPT model from Scratch To Generate Text "
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "f9eac223-a125-40f7-bacc-bd0d890450c7",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "matplotlib version: 3.7.2\n",
+      "torch version: 2.2.1\n",
+      "tiktoken version: 0.5.1\n"
+     ]
+    }
+   ],
+   "source": [
+    "from importlib.metadata import version\n",
+    "\n",
+    "import matplotlib\n",
+    "import tiktoken\n",
+    "import torch\n",
+    "\n",
+    "print(\"matplotlib version:\", version(\"matplotlib\"))\n",
+    "print(\"torch version:\", version(\"torch\"))\n",
+    "print(\"tiktoken version:\", version(\"tiktoken\"))"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "e7da97ed-e02f-4d7f-b68e-a0eba3716e02",
@@ -1478,7 +1506,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.12"
+   "version": "3.11.4"
   }
  },
  "nbformat": 4,