Edited codeblock 7.26 (reduced number of changes as mentioned)

Author: var-nan

chapter07_working-with-keras.ipynb

@@ -6,7 +6,11 @@
     "colab_type": "text"
    },
    "source": [
-    "This is a companion notebook for the book [Deep Learning with Python, Second Edition](https://www.manning.com/books/deep-learning-with-python-second-edition?a_aid=keras&a_bid=76564dff). For readability, it only contains runnable code blocks and section titles, and omits everything else in the book: text paragraphs, figures, and pseudocode.\n\n**If you want to be able to follow what's going on, I recommend reading the notebook side by side with your copy of the book.**\n\nThis notebook was generated for TensorFlow 2.6."
+    "This is a companion notebook for the book [Deep Learning with Python, Second Edition](https://www.manning.com/books/deep-learning-with-python-second-edition?a_aid=keras&a_bid=76564dff). For readability, it only contains runnable code blocks and section titles, and omits everything else in the book: text paragraphs, figures, and pseudocode.\n",
+    "\n",
+    "**If you want to be able to follow what's going on, I recommend reading the notebook side by side with your copy of the book.**\n",
+    "\n",
+    "This notebook was generated for TensorFlow 2.6."
    ]
   },
   {
@@ -1372,8 +1376,8 @@
     "        with tf.GradientTape() as tape:\n",
     "            predictions = self(inputs, training=True)\n",
     "            loss = self.compiled_loss(targets, predictions)\n",
-    "        gradients = tape.gradient(loss, model.trainable_weights)\n",
-    "        optimizer.apply_gradients(zip(gradients, model.trainable_weights))\n",
+    "        gradients = tape.gradient(loss, self.trainable_weights)\n",
+    "        self.optimizer.apply_gradients(zip(gradients, self.trainable_weights))\n",
     "        self.compiled_metrics.update_state(targets, predictions)\n",
     "        return {m.name: m.result() for m in self.metrics}"
    ]
@@ -1417,9 +1421,9 @@
    "toc_visible": true
   },
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "alan-env",
    "language": "python",
-   "name": "python3"
+   "name": "alan-env"
   },
   "language_info": {
    "codemirror_mode": {
@@ -1431,9 +1435,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.0"
+   "version": "3.8.10"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 0
-}
+ "nbformat_minor": 1
+}