fix issue #664 - inverted token and pos emb layers (#665)

* fix inverted token and pos layers

* remove redundant code

---------

Co-authored-by: rasbt <mail@sebastianraschka.com>

ch02/01_main-chapter-code/exercise-solutions.ipynb

@@ -46,8 +46,8 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "torch version: 2.4.0\n",
-      "tiktoken version: 0.7.0\n"
+      "torch version: 2.6.0\n",
+      "tiktoken version: 0.9.0\n"
      ]
     }
    ],
@@ -327,21 +327,13 @@
     "    raw_text = f.read()\n",
     "\n",
     "tokenizer = tiktoken.get_encoding(\"gpt2\")\n",
-    "encoded_text = tokenizer.encode(raw_text)\n",
-    "\n",
-    "vocab_size = 50257\n",
-    "output_dim = 256\n",
-    "max_len = 4\n",
-    "context_length = max_len\n",
-    "\n",
-    "token_embedding_layer = torch.nn.Embedding(context_length, output_dim)\n",
-    "pos_embedding_layer = torch.nn.Embedding(vocab_size, output_dim)"
+    "encoded_text = tokenizer.encode(raw_text)"
    ]
   },
   {
    "cell_type": "code",
    "execution_count": 13,
-   "id": "0128eefa-d7c8-4f76-9851-566dfa7c3745",
+   "id": "15c184fe-5553-4df2-a77f-7504901b6709",
    "metadata": {},
    "outputs": [
     {
@@ -371,7 +363,7 @@
   {
    "cell_type": "code",
    "execution_count": 14,
-   "id": "ff5c1e90-c6de-4a87-adf6-7e19f603291c",
+   "id": "739990b2-ce4c-4d17-88e3-547c8c312019",
    "metadata": {},
    "outputs": [
     {
@@ -415,7 +407,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.4"
+   "version": "3.10.16"
   }
  },
  "nbformat": 4,