improved example

use  `plt.show()` for ploting example, like in chapter "Preprocess the data"

Author: vruge

site/en/tutorials/keras/basic_classification.ipynb

@@ -805,7 +805,8 @@
         "plt.subplot(1,2,1)\n",
         "plot_image(i, predictions, test_labels, test_images)\n",
         "plt.subplot(1,2,2)\n",
-        "plot_value_array(i, predictions,  test_labels)"
+        "plot_value_array(i, predictions,  test_labels)",
+        "plt.show()"
       ],
       "execution_count": 0,
       "outputs": []
@@ -823,7 +824,8 @@
         "plt.subplot(1,2,1)\n",
         "plot_image(i, predictions, test_labels, test_images)\n",
         "plt.subplot(1,2,2)\n",
-        "plot_value_array(i, predictions,  test_labels)"
+        "plot_value_array(i, predictions,  test_labels)",
+        "plt.show()"
       ],
       "execution_count": 0,
       "outputs": []
@@ -856,7 +858,8 @@
         "  plt.subplot(num_rows, 2*num_cols, 2*i+1)\n",
         "  plot_image(i, predictions, test_labels, test_images)\n",
         "  plt.subplot(num_rows, 2*num_cols, 2*i+2)\n",
-        "  plot_value_array(i, predictions, test_labels)\n"
+        "  plot_value_array(i, predictions, test_labels)\n",
+        "plt.show()"
       ],
       "execution_count": 0,
       "outputs": []