Remove shuffling for the test dataset (#559)

In order to have a good picture with https://projector.tensorflow.org/

Author: VladimirStarostenkov

docs/tutorials/losses_triplet.ipynb

@@ -167,7 +167,7 @@
         "train_dataset = train_dataset.shuffle(1024).batch(32)\n",
         "train_dataset = train_dataset.map(_normalize_img)\n",
         "\n",
-        "test_dataset = test_dataset.shuffle(1024).batch(32)\n",
+        "test_dataset = test_dataset.batch(32)\n",
         "test_dataset = test_dataset.map(_normalize_img)"
       ],
       "execution_count": 0,