minor cosmetic fixes in nb ch 15

Author: rasbt

code/ch15/ch15.ipynb

@@ -1588,10 +1588,10 @@
     "                logits=h4, labels=tf_y_onehot),\n",
     "            name='cross_entropy_loss')\n",
     "        \n",
-    "        ## Optimizer:\n",
+    "        ## Optimizer\n",
     "        optimizer = tf.train.AdamOptimizer(self.learning_rate)\n",
     "        optimizer = optimizer.minimize(cross_entropy_loss,\n",
-    "                              name='train_op')\n",
+    "                                       name='train_op')\n",
     "\n",
     "        ## Finding accuracy\n",
     "        correct_predictions = tf.equal(\n",
@@ -1819,7 +1819,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.1"
+   "version": "3.6.5"
   }
  },
  "nbformat": 4,