fix: add pad token setting and clarify tokenization in finetuning notebook

Author: Manmohit509

ai/Finetuning/finetune.ipynb

@@ -114,6 +114,8 @@
     "tokenizer = \n",
     "model =\n",
     "\n",
+    "# Set pad token (because the end of the sentence is not detected by the model)\n",
+    "tokenizer.pad_token =\n",
     "\n",
     "print(f\"✅ Model '{model_name}' loaded successfully!\")\n",
     "print(f\"Model has {model.num_parameters():,} parameters\")\n"
@@ -237,7 +239,7 @@
     "\n",
     "# 2. Tokeniser nos données (transformer le texte en nombres)\n",
     "def tokenize_function(examples):\n",
-    "    format_function(examples)\n",
+    "    texts = format_function(examples)\n",
     "    \n",
     "    # On n'utilise PAS return_tensors ici car Dataset.map() attend des listes, pas des tensors\n",
     "    tokenized = tokenizer(\n",